An Annotated Bibliography of Cetacean Releases
Kenneth C. Balcomb III
Center for Whale Research
Friday Harbor, WA 98250
Assembled here are selected references which may provide useful background
for rehabilitating and returning captive cetaceans to their natural habitats.
This is not an exhaustive listing. It was assembled primarily to provide
a starting point for further research needed for Cetacean reintroduction.
Draft Document prepared by K.C. Balcomb, D. Claridge, S. Norman, H. Garrett,
and D. Ellifrit. Abstracted
from publications without authors' permission,
as presented by authors. Comments and additions invited.
Abel, R., 1986. Husbandry and training of captive dolphins. In Research
on dolphins (M.M. Bryden and R.J. Harrison, eds.), Oxford University Press,
Oxford, pp. 183-187.
The application of basic animal
handling and husbandry techniques, used widely in husbandry of domestic
animals, can be applied to marine mammals with beneficial results. Introduces
the useful term 'estimated normal body weight' to provide an index of animal
condition. Recommends dolphins be weighed monthly. Weight loss of up to
12 percent is not noticeable to the eye by other than the most experienced
Anonymous, 1993. Marine Mammal Inventory Report. National Marine Fisheries
Service, NOAA. Available from Office of Protected Species, 1335 East-West
Highway, Silver Springs, MD. 20910.
MMIR August 1993
listing of all marine mammals held in accredited marine parks and aquaria,
as reported to NMFS. Includes deceased specimens and some institutions outside
of U.S. Note:
Survivability and reporting appears variable between
institutions. USDA now listing.
Asper, E., W. Young, and M. Walsh, 1988. Observations on the birth and
development of a captive-born killer whale. IntZooYb(27):295-304.
Asper, E. and L. Cornell, 1988. Live capture statistics for the killer
whale (Orcinus orca) 1961-1976 in California, Washington and British Columbia.
Avise, J.C., 1989 Gene trees and organismal histories: a phylogenetic
approach to population biology. Evolution:1192-1208.
A "gene tree" is the phylogeny of alleles or haplotypes for any
specified stretch of DNA. Results of analyses for more than 20 vertebrate
species strongly suggest that the demographies of populations have been
remarkably dynamic and unsettled over space and recent evolutionary time.
Avise, J.C., J. Arnold, R. Ball, E. Bermingham, T. Lamb, J. Neigel, C.
Reeb and N. Saunders, 1987. Intraspecific phylogeography: the mitochondrial
DNA bridge between population genetics and systematics. Annual Review of
Ecology and Systematics, 18:489-522.
has provided the first extensive and readily accessible data avilable to
evolutionists in a form suitable for strong geneaological inference at the
intraspecific level. Many species have proved to exhibit a deep and geographically
structured mtDNA phylogenetic history.
Backus, R.H., 1961. Stranded Killer Whale in the Bahamas. Journal of
Mammalogy. 42: 418-419.
Reports upon a killer whale which
stranded live on Man-O-War Cay, Abaco in 1960. Photographs and specimen
materials were taken. Note:
The mandibles of this specimen are at
Albury's store on Man-O-War Cay. One of first records documenting occurrence
of killer whale in the Bahamas.
Bailey, R.E., 1965. Training and open ocean release of an Atlantic bottlenose
porpoise, (Tursiops truncatus) (Montagu). NOTS TP 3838, pp, 1-18.
Baker, J.R., 1992. Skin Disease in wild cetaceans from British waters.
Aquatic Mammals, 18.1, 2732.
Eighty-one dead cetaceans
of a variety of species and from British waters (most from 1989-1991) were
examined for evidence of skin disease and 69% were found to be affected.
The most common conditions were wounds and other traumatic injuries, viral
infections (predominantly pox) and a variety of scars. One porpoise showed
an area of raised rough irregular skin in the edge of a partly healed laceration.
Histologically there was very marked elongation of the papillae and the
outer layers of the epidermis were disorganized with a patchy build-up of
the external layers. The lesion was considered to be a papilloma. Note:
Viral organisms including those suspected of causing papillomas apparently
occur in free-ranging North Atlantic cetacean populations.
Baker, J.R. and A.R. Martin, 1992. Causes of mortality and incidental
parasites and lesions in harbour porpoises (Phocoena phocoena) from British
waters. Veterinary Record.
Baker, J.R., 1992. Causes of mortality and incidental parasites and lesions
in dolphins and whales from British waters. Veterinary Record.
Balcomb, K, J. Boran and S. Heimlich, 1982. Killer whales in Greater
Puget Sound. RepIntWhalCommn(32):681-686.
Berzin A., and V. Vladimirov, 1982. A new species of killer whale (Cetacea,
Delphinidae) from Antarctic waters. [in Russian] ZoolZh(62):287-295.
Bigg M. and A. Wolman, 1975. Live-capture killer whale (Orcinus orca)
fishery, British Columbia and Washington, 1962-73. [In] Mitchell, E. (Ed)
Review of biology and fisheries for smaller cetaceans, JourFishResBdCan
Bigg, M., I. MacAskie, and G. Ellis, 1976. Abundance and movements of
killer whales off eastern and southern Vancouver Island with comments on
management. Unpub Report Atctic Biological Stn, Ste Anne de Bellevue, Quebec.
Bigg, M., 1982. An assessment of killer whale (Orcinus orca) stocks off
Vancouver, Island, British Columbia. RepIntWhalCommn (32):655-666.
Bossart, G. and E. Eimstad, 1988. Erisipelothrix vesicular glossitis
in a killer whale (Orcinus orca). JourZooAnMed 19(1-2):42-47.
Balcomb, K.C., 1994. A note on age specific survival and lifespan of
killer whales, Orcinus orca. Submitted to Marine Mammal Science, November
1993. Returned for revision.
Survival rates in young
killer whales from age 1-21 are significantly lower than comparably calculated
survival rates for the same age cohort in the wild. Maximum age for this
species free-ranging in the Pacific Northwest is estimated from historical
photographs to be at least 40+ for males and 60+ for females. Females in
this population typically reach sexual maturity in their mid-teens, and
males reach sexual maturity in their mid to late teens. Note:
is approaching the age beyond which very few male killer whales survive
Barr, B., J.L. Dunn, M.D. Daniel and A. Banford, 1989. Herpes-like Viral
Dermatitis in a Beluga Whale (Delphinapterus leucas). Journal of Wildlife
Diseases. 25: 608-611.
Approximately 35 months following
its capture, a beluga whale developed focal pale gray skin lesions. These
lesions persisted for at least 8 months. A biopsy from one of these sites
revealed epithelial inclusions. Herpes-like viral particles were seen by
transmission electron microscopy. The eventual regression of skin lesions
and lack of other clinical signs suggests the virus was only mildly pathogenic
in this animal.
Bassos, M.K. 1993. A behavioral assessment of the reintroduction of two
bottlenose dolphins. Masters Thesis, UC Santa Cruz, CA. pp. 84.
"The dolphins appear to have successfully reacclimated to life in the
wild. They displayed typical behavioral patterns observed for other wild
dolphins, and their ranging and social association patterns were similar
to their most frequent associates."
Benirschke, K. and H.H. Cornell, 1987. The placenta of the Killer Whale
(Orcinus orca). Marine Mammal Science. Vol. 3, No. 1, pp. 82-86.
Discusses the gross & histological description of a placenta from a captive
killer whale. Grossly it was bicornuate with a distinctly separate allontoic
cavity. The cord surface was covered with many black and fewer white pustules
and plaques (the function of which is known). Histologically the chorion
resembled other cetaceans', cuboidal to columnar epithelium covering the
Best, P.B., D.W. Rice and A.A. Wolman, 1978. Age, Growth, and Sexual
Dimorphism in Killer Whales (Orcinus orca). Proceedings (
International Conference on Determining Age of Odontocete Cetaceans, La
Jolla, Calif. Sept.5-7, 1978.
Bigg, M.A., G.E. Ellis, J,K.B. Ford, and K.C. Balcomb, 1987. Killer Whales,
a study of their genealogy and natural history in the Pacific Northwest.
Compiles photo-identification history
of resident and transient killer whales in the Pacific Northwest of North
This study demonstrates utility of photo-identification
technique for field studies of free-ranging killer whales.
Bigg, M.A., P.F. Olesiuk, G.E. Ellis, and K.C. Balcomb, 1990. Social
organization and genealogy of resident killer whales (Orcinus orca) in the
coastal waters of British Columbia and Washington State [In] Hammond, et.
al. (Eds.) Individual recognition of Cetaceans. Int. Whal. Commn. Special
Issue 12, Cambridge.
261 Pacific Northwest killer whales
were alive in 1987 in two resident communities. A community comprises individuals
that share a common range and associate with one another; a pod is a group
of individuals within a community that travels together the majority of
the time; a subpod is a group of individuals that temporarily fragments
from its pod to travel separately; an intra-pod group consists of a cohesive
group of individuals within a subpod that always travels in close proximity.
The genealogical trees indicate that intra-pod groups are matrilines. A
matrilineal group typically comprises 2-3 generations. Pod-specific dialects
suggest that related pods eventually associate randomly. The lack of dispersal
of the resident form of killer whale from their natal groups appears to
be unique among mammalian social systems. This species has the potential
to have developed many local races over its cosmopolitan range, with each
race having unique social and behavioral characteristics.
Bossart, G.D. and L.A. Dierauf, 1990. Marine mammal clinical laboratory
medicine. In: Handbook of marine mammal medicine: health, disease, and rehabilitation.
(L.A. Dierauf,ed.) p.42. CRC Press, Boca Raton.
baseline blood values must be established for each animal in one's care
before being confident that any particular value is abnormal. A minimum
of two annual blood samples from each individual is recommended. A delay
in more than 15 min in centrifugation of the clot from the serum can lower
sodium, potassium, creatinine, blood urea nitrogen (BUN), and globulin values,
and can raise calcium, phosphorous, total protein, and albumin values. There
is little hematologic data on the larger cetaceans. Table 4. provides normal
ranges of cetacean hematology and serum chemistry reported. Case history
1 describes erysipelas treatment for killer whale; 2 describes hepatitis
B treatment in a dolphin; 3 describes marked elevation in GGT; 4 describes
pancreatitis in dolphins; 5 describes melioidosis in a dolphin; 6 describes
candidiasis in dolphins. Table 10 provides a flow diagram for marine mammal
Bowers, C.A. and R.S. Henderson, 1972. PROJECT DEEP OPS: Deep Object
Recovery with Pilot and Killer Whales. NUC TP 306. Undersea Surveillance
and Ocean Sciences Department, Naval Undersea Center, San Diego, CA. Unclassified,
Describes in detail the US Navy program from 1968
to 1971 for two male killer whales (Ahab and Ishmael) which were captured
in Puget Sound, WA and airlifted to Point Mugu, CA, and later to Kaneohe,
HI. Both killer whales were maintained at NUC Hawaii in fenced ocean pens,
"...with low maintenance costs and excellent animal health." By
September 1970, both whales had attained "open ocean reliability",
wherein they would accompany a vessel out to sea an average of five times
per week for a round trip distance of 10-12 nautical miles, typically swimming
alongside the vessel at speeds of 6-7 knots. Ishmael on 19 February 1971
did not respond to his underwater recall signal and apparently swam away.
On 8 June 1971, Ahab went on a 24 hour excursion ranging over 50 nautical
miles in a northwesterly direction along the Oahu coast, and no further
sea trials were conducted with him. Ahab died in 1974 at an estimated age
of 15-16. Note:
This report is important documentation of transport
of cold water adapted killer whales to tropical latitude, their successful
maintenance and open ocean training, their instrumentation, and in Ishmael's
case a release. We will examine all relevant US Navy photographs of Ishmael
to ascertain whether he has been subsequently documented in any known populations
of killer whales in the North Pacific Ocean.
Brill, R.L. and W.A. Friedl, 1993. Reintroduction to the wild as an option
for managing Navy Marine Mammals. Technical Report 1549, Naval Command,
Control and Ocean Surveillance Center, San Diego, CA, 92152-5001.
This report documents the efforts made to provide information to respond
to a Congressional request to "...develop training procedures which
will allow mammals which are no longer required for this project to be released
back into their natural habitat..."
Conclusions: There is no compelling scientific reason for reintroducing
nonendangered species. Proven methods of operant conditioning can be used
to prepare marine mammals for reintroduction to the wild. The success of
reintroducing marine mammals to the wild, however, depends upon resources,
methodologies, and technologies which do not currently exist. The success
of a Navy reintroduction program would depend on developing technologies
for monitoring and tracking reintroduced animals to quantify the success
of the effort. "Such technology does not exist and its development
is estimated to take at least 2 years." In terms of cost effectiveness,
the lifetime care and maintenance of the animals is preferable to reintroduction.
The methodologies and technologies for reintroduction do exist
and they were published and available as of the drafting of the Navy report.
Britt, J.0. and E.B. Howard, 1983. Virus Disease In: Pathobiology of
marine mammal diseases vol 1 (E.B. Howard,ed.) pp.50-51. CRC Press, Boca
Evaluates material from 1,500 marine mammal necropsies.
The field of marine mammal virology is in its infancy. Section of chapter
on viral diseases describing the gross and microscopic lesions of dolphin
Brown, David H. and Kenneth S. Norris, 1956. Observations of Captive
and Wild Cetaceans. Journal of Mammalogy 37(3): 311-26.
Describes sightings of Pacific killer whales, some involving fairly close
approaches to the research vessel and to Marineland for the Pacific oceanarium.
Buck, J.D. and S. Spotte, 1986. Microbiology of Captive White-beaked
Dolphins (Lagenorhynchus albirostris) with comments on Epizootics. Zoo Biology.
In March 1983, 6 female whitebeaked dolphins
were rescued from an ice clogged bay in Newfoundland, Canada, and transported
to Mystic Marinelife Aquarium. Anal and blowhole samples (swabs) were collected
at frequent intervals for bacteriological analysis. One dolphin died of
neurogenic shock syndrome in transit. The others died at intervals of 1-101
days during captivity. Staphylococci were implicated in the deaths of 3
of the 5 dolphins that remained alive after capture. Euysipelothrix rhusiopathiae
probably caused the death of the fourth, and infection by unidentified gram-negative
bacteria was responsible for the death of the fifth dolphin. The two dolphins
that survived the longest (44 and 101 days) showed a predominance of species
of Protues, Margalella, and Pseudomones. Several genera of potential significance
to humans also were found (e.g., Vibrio alginolyticus, V. fluvialis and
Buck, J.D., 1984. Microbiological observations on two stranded live whales.
Journal of Wildlife Diseases. 20: 148-150.
is available on types of microorganisms associated with healthy cetaceans
to compare with data from debilitated animals. More studies are needed to
define which microbes are associated with both wild and recently stranded
animals. It is also necessary to know if microorganisms associated with
healthy or diseased animals are potentially zoonotic. Swabs were taken from
a stranded pygmy sperm whale and a juvenile pilot whale. Most of the organisms
isolated from the sperm whale have been reported in apparently healthy dolphins
and pinnipeds. A few of the organisms from the pilot whale have been known
to cause disease in humans. Caution chould be used by personnel who handle
stranded animals to prevent exposure to bacteria that are potentially hazardous
Burn, D.M. and G.P. Scott, 1988. Synopsis of available information on
marine mammal-fisheries interactions in the southeastern United States:
preliminary report, NOAA/NMFS/SEFC/Miami Laboratory, Coastal Fisheries Resources
Division Contribution CRD-87/88-26.
Case, R.A.M., 1948. A study of the incidence of disease in a whaling
expedition to the Antarctic pelagic whaling grounds 1946-7. British Society
of Medicine. 2: 1-17.
Castillo, O., H. Lehmann and L. Jones, 1977. The myoglobin of the killer
whale. Biochimica et Biophysica Acta(491): 23-28.
Calambokidis, J., G.H. Steiger, J.C. Cubbage, K.C. Balcomb, and P. Bloedel,
1989. Biology of humpback whales in the Gulf of the Farallones. Final Report
for Contract No. CX 8000-6-0003, to Gulf of the Farallones National Marine
Sanctuary, Fort Mason Center, San Francisco, CA, pp. 91.
Over 1,000 sightings of humpback whales were made during vessel and aerial
surveys, and 225 different individuals were photo-identified from 1986-1988.
On average, identified whales were seen more than five times each year.
Humphrey, the whale that swam up the Sacramento River in 1985 (and was stuck
in a slough until he was escorted back out under the Golden Gate Bridge
25 days later) was seen in all three years. Note:
return of Humphrey to the wild was considered impossible by many, including
the authors, but the whale proved us wrong and survived to strand again
in San Francisco Bay in 1988. He was escorted out again a few days later,
and has not been seen since. His survival is a testament to his hardiness.
Cates, M.B. and J.P. Schroeder, 1986. The nutrition of acclimated newly
captured Tursiops truncatus. Aquatic Mammals, 17-20.
Two groups of Atlantic bottlenose dolphins, Tursiops truncatus one
in captivity for over 6 years, the other captured in the Mississippi Sound
and transported to Hawaii in April, 1984, were monitered monthly
for weight changes and daily for food consumption. Gross energy was measured
on each shipment of fish and used to calculate energy consumption of the
individual dolphins. During this time, at least 3 major diet changes occurred,
due to unavailability of preferred fish species and too poor quality of
some of the substituted species. Similarities were noted between the two
groups of dolphins as reflected in weight change patterns and caloric requirements.
It appears that newly captured animals, even after long-distance transport,
permanent change of environment and several diet changes, adapt readily,
showing comparable nutritional responses with the acclimated group of animals.
Cates, M.B., L. Kaufman, J.H. Grabau, J. Pletcher and J.P. Schroeder,
1986. Blastomycosis in an Atlantic bottlenose dolphin. Journal of the American
Veterinary Medical Association. 189: 1148.
An adult female
Atlantic bottle-nosed dolphin caught in the Mississippi Sound of the Gulf
of Mexico was kept in an open ocean pen in Kaneohe bay, Hawaii. One year
after capture, the dolphin developed lethargy, anorexia, and cranial swelling.
An abscess was found on the right craniolateral aspect of the melon from
which Vibrio sp, and later Candida sp, were isolated. Despite antibiotic
and antifungal treatment, respiratory disease and anorexia developed and
the dolphin died 4 weeks after the onset of illness. The rarity of blastomycosis
in cetaceans and the delayed development of respiratory illness hindered
diagnosis of the disease. Nutrition was not considered a factor in the development
or progression of disease in this dolphin.
Christensen, I., 1982. Killer whales in Norwegian coastal waters. SciRepIWC(32):633-641.
Claridge, D.E. and K.C. Balcomb, 1993. In search of marine mammals. Bahamas
studies of free ranging cetaceans in Bahamian waters. Cites two recent sightings
of killer whales in Bahamian waters. Also documents a successful reintroduction
to the wild of a bottlenose dolphin which had spent seventeen years in captivity.
Killer whales have been sighted and/or photographed in Bahamian
waters on at least three occasions in the past three years, and it now appears
that at least some whales of this species widely range in these waters during
all seasons of the year. It is not yet known how they relate to other killer
whale sightings in the Caribbean or tropical Atlantic Ocean, nor has their
prey preference been identified. All that we know is that the habitat is
apparently suitable for them and obviously within their thermoneutral range.
In May and June 1995, a pod of killer whales was seen and photodocumented
off Hope Town, Abaco. One of the whales had a spotted dolphin (Stenella
sp.) in its mouth. They apparently eat marine mammals. One of the individuals
in the pod matched to a whale previously photo-identified in the Gulf of
Cordes, D.O., 1982. Dolphins and their diseases. New Zealand Veterinary
Journal. 30: 46-49.
Thirty-eight species of small cetaceans
termed "dolphins and porpoises" are listed. This review is a contribution
to the growing general and veterinary interest in the welfare and diseases
of these animals.
Cornell, L.H., 1974. Puget Sound Already is a Killer Whale Sanctuary.
Pacific Search. 9(1): 16-18.
Sea World's defense of capturing
killer whales in Puget Sound.
Cornell, L.H., 1983. Hematology and clinical chemistry values in the
killer whale, Orcinus orca. Journal of Wildlife Diseases 19(3): 259-64.
Clinical hematology and blood chemistry values reported
for the killer whale collected over a 10-year period at Sea World facilities.
"Normal" differences observed among age classes emphasize the
importance of establishing an animal's individual hematologic and blood
chemistry profile by routine sampling.
Cornell, L.H., 1993. Veterinary evaluation of Keiko. Report to Fund for
Animals, July 1993.
Cornell considered Keiko's problems
iatrogenic (stress-related), and rehabilitation/release possible.
Cowan, D.F., 1968. Lung diseases in whale and dolphins. In Proceedings
of 2nd Conference on Diseases of Aquatic Mammals, Boca Raton, Fla, pp. 145-151.
Cowan, D.F., 1966. Pathology of the pilot whale (Globicephala melaena).
Arch. Path. 82: 178-179.
A systemic necropsy examination
of 55 pilot whales is described. The predominant disease is parasitism by
a wide variety of worms, the most vulnerable organ system being the lower
respiratory tract. The relationship of altered form and function to the
severity of the disease is discussed. Other diseases include focal myocarditis,
arteriosclerosis, basophilic degeneration of the myocardium, sarcosporidiosis
of the cardiac and skeletal musculature, focal embolic glomerulitis, and
simple colloid goiter and fillicular hyperplasia of the thyroid. Foreign
body granulomata of the thyroid were found, due to ectopic colloid. A specimen
of an osteoarthritic spine is described.
Coyle, V. and J. Hickman, 1988. Readaption and Release to the wild for
Joe and Rosie. Published by ORCA, Oceanic Research Communication Alliance,
Tides Foundation 873 Sutter St, Suite A, San Francisco, CA 94109.
Provides summary of "Joe" and "Rosie" release project,
together with newspaper clippings and information on followup. Apparently,
there were reliable reports of these two dolphins coping successfully in
the wild as late as October 1987. Note:
Dr. Joe Geraci of Guelph
University examined the cause of this die-off and reported it to be coincident
with high contaminant levels in the dolphin tissues which may have suppressed
their immune system. See Geraci, 1989 in this bibliography.
Cusick, P.K. and B.C. Bullock, 1973. Ulcerative dermatitis and pneumonia
associated with Aeromonas hydrophila infection in the bottlenose dolphin.
Journal of the American Veterinary Medical Association. 163: 578-579.
The report is concerned with Aeromonas hydrophila infection in a bottle-nosed
dolphin originally captured with the intent of training it for use as an
entertainment attraction, but died while en route from St. Louis to North
Carolina. It was received with a history of illness of about 2 months' duration
that was unresponsive to treatment with several antibiotics. Previous examination
had resulted in diagnoses of pneumonia and ulcerative dermatitis. Psuedomonas
spp. had been isolated from the blood. The lesions described in this dolphin
are quite similar in some respects to those described in some fish suffering
from Aeromonas punctata infection. With the exception of a report concerning
an alligator, pneumonia has not been an important factor in any of the reports
of disease in aquatic animals associated with either A. punctata or A. hydrophila.
The pneumonia in the dolphin of this report was marked.
Dailey, M.D. and R.K. Stroud, 1978. Parasites and associated pathology
observed in cetaceans stranded along the Oregon Coast. Journal of Wildlife
Diseases. 14: 503-511.
Ten stranded cetaceans, representing
5 species, from the Oregon coast were examined between 1973-1977. Fourteen
general of parasites, together with the pathogenesis and pathology with
the presence of some of these parasites are reported.
Dalheim and Heyning, in press. Killer Whale. [In] Ridgeway and Harrison
[Eds] Handbook of Marine Mammals vol 6., Academic Press, London
Davis, R., 1975. Sea Wolves of the Pacific Northwest. British Columbia
Outdoors. Pt.1,Vol.31(3) May/June, pp.6-10; Pt.II,Vol.31(4) July/Aug., pp.20-25.
Lengthy discussion of pros and cons of capturing and
keeping killer whales.
Demaster, D.P. and J.K. Drevenak, 1988. Survivorship Patterns in Three
Species of Captive Cetaceans. Marine Mammal Science. 4(4): 297-311.
Discussion of problems in determining the longevity of killer whales in
captivity. Annual survival rate for males 0.88 and for females 0.96, calculated
on daily basis.
Diamond, S.S., D.E. Ewing and G.A. Caldwell, 1979. Fatal bronchopneumonia
and dermatitis caused by Pseudomonas aeruginosa in an Atlantic bottlenose
dolphin. Journal of the American Veterinary Medical Association. 175: 984-987.
A captured female Atlantic bottle-nosed dolphin began
to lose weight during transport to a holding facility. Areas of epidermal
necrosis developed along with continued weight loss and normal appetite.
On day 70 after capture, the dolphin was in great distress with dyspnea
and anorexia, and hard dermal nodules had developed all over the body surface.
They were hard, round, and raised, with necrotic centers, some being confluent.
The dolphin subsequently died on day 70 and a necropsy was performed. Most
marine mammal clinicians believe that P. aeruginosa is an opportunistic
organism. Diseases that lead to immunosuppression are frequently followed
by secondary infections that range from peracute hemorrhagic bronchopneumonia
to chronic abscessation. Pseudomonas is listed as one of the more frequent
agents of pneumonia in mammals. It was believed that P. aeruginosa isolated
from the lesions in this case was in fact the etiologic agent. Note:
It was postulated that the dolphin probably came in contact with the organism
during captivity and that its debilitated condition provided a fertile environment
for P. aeruginosa to proliferate and cause the disease described.
Dover, S.R. 1992. Poxvirus infection in a killer whale: clinical signs
and diagnosis. IAAAM Proceedings, Volume 23. College of Veterinary Medicine,
Oklahoma State University.
Poxvirus lesions noted in
three year old captive killer whale (Sea World, Ohio) in 1991 and still
present in 1992. "It begins as a small circular lesion and progressively
enlarges. Adjacent lesions may coalesce to form larger areas. The lesions
are visible in both pigmented and non-pigmented areas. They are slightly
raised on the active borders only, with the exception of a lesion on this
animals fluke, which was raised, pigmented and hyperplastic. There have
been no behavioral signs of illness in this animal and hematologic and biochemical
parameters indicated a mild inflammatory response. It does not appear to
be detrimental to cetaceans, and is generally a self limiting disease.
Dragesund, O. and O. Ulltang, 1975. Stock size fluctuations and rate
of exploitation of the Norwegian spring-spawning herring, 1950-1974. CounMeetIntCounExplorSea
Dudok van Heel, W.H., 1977. Successful treatment in a case of lobomycosis
(Lobo's Disease) in Tursiops truncatus (Mont) at Dolfinarium, Harderwijk.
Aquatic Mammals. 5: 8-15.
In the earlier paper (Poelma
et al., 1974) the observation of a case of Lobomycosis (Lobo's disease)
in the Dolphinarium, Harderwijk, was described. The animal, an old male
Tursiops truncatus, was treated successfully with the fairly new drug Miconazole.
The treatment lasted from September 17, 1974 until April 28, 1975. At the
time of conclusion of this report (December 1976) no recurrence of the infection
has been observed.
Dudok Van Heel, W.H., 1986. From the Ocean to the Pool. In: Research
on Dolphins (M.M. Bryden and R. Harrison [eds.]), pp. 163-182. Oxford Science
Dudok van Heel's detailed chapter on captive
orcas is a primer on how to catch, transport, and maintain orcas. Longest
survived transport 63 hours. Describes Icelandic captures.
Duffield, D.A. and K.W. Miller, 1988. Demographic Features of Killer
Whales in Oceanaria in the United States and Canada, 1965-1987. Rit Fiskideildar.
Annual mortality rate estimated from "animal
years" in captivity was 8.9%. Females have a linear growth rate up
to age 10-12 and males up to 12-16 about the time they become sexually mature.
Various females first gave birth at age 11, 12, 13, and 15. A 17-month gestation
period based on serum and urine progesterone studies. Note:
rates calculated were not age-specific; nonetheless, they do overall indicate
a high mortality rate for captive killer whales.
Dunn, J.L., 1990. Bacterial and mycotic diseases of cetaceans and pinnipeds.
In: Handbook of marine mammal medicine: health, disease and rehabilitation
(L.A. Dierauf,ed.) pp.73-96. CRC Press, Boca Raton.
of chapter to briefly acquaint its readers with the common, clinically important
bacterial and mycotic diseases of marine mammals.
Dunn, J.L., J.D. Buck and S. Spotte, 1982. Candidiasis in captive cetaceans.
Journal of the American Veterinary Medical Association. 181: 1310-1315.
Disseminated Candida albicans infections were found or
suspected in 4 captive cetaceans. Ketaconazole at a dosage of 2.5mg/kg,
BID, administered orally for 18 days, followed by 8 biweekly oral doses
of lavamisole hydrochloride at the rate of 9 mg/kg, resulted in regression
of clinical signs in an adult male Atlantic bottlenose dolphin (Tursiops
truncatus). A higher dosage of ketoconazole (6mg/kg, BID) was effective
in eliminating the shedding of C albicans from a adult belukha whale (Delphinus
leucas). A juvenile female harbor porpoise (Phocoena phocoena) treated with
nystat died with disseminated candidiasis, as did a juvenile male longfinned
pilot whale (Globicephala melaena) treated with mystatin and levamisole.
Three other adult bottlenose dolphins, a juvenile female belukha whale,
and a female Commerson's dolphin (Cephalorhyncus commersonii) kept in the
same water system never had evidence of candidiasis. A 5th bottlenose dolphin
(adult female) was culture-positive on one occasion, but never had signs
of the disease.
Early, G. and T. Rumage, 1988. A whale's fancy and the three that got
away. Whalewatcher, Vol 22(1): pp. 3-5. published by the American Cetacean
Society, P.O. Box 2369, San Pedro, CA 90731.
pilot whales ("Baby", "Notch" and "Tag") were
rescued from a mass stranding event at Cape Cod on 3 December 1986, and
rehabilitated at the New England Aquarium. After making a significant recovery
and gaining weight, the three whales were evaluated for behavioral and social
fitness for release. Two critical behaviors assessed were ability to act
as their own small group, and the ability to forage. "In the early
feedings the whales would quickly eat the fish and not play with them. As
live fish became a more regular part of the whales' diet, the whales would
eat them more slowly and play with them longer." "The stability
of their group behavior was best seen in the whales' response to novel stimuli,
in particular the playback of sounds from free ranging pilot whales."
"The whales reacted strongly to the playback." "All whales,
particularly "Baby" showed an increase in attention to the speaker
during playbacks. No specific call or pattern of sounds appeared to have
a specific effect on the whales, although thge activity level in the pool
seemed to vary directly in proportion to the rate of calling on the tape."
The whales were released after seven months of rehabilitation and evaluation.
See Mate, 1989 in this bibliography.
Erickson. K.L., W.G. Ferlin, L. Landon, S. Chivers, T. Reidarson, R.S.
Wells, J. Stott, and D.A. Ferrick, 1993. Interleukin-2 receptor expression
assay: a novel method for measuring immunocompetence.
Abstracts, Tenth Biennial
Conference on the Biology of Marine Mammals, Galveston, TX. November 11-15.
Measuring the expression of IL-2R is a method of determining
the activation capacity of lymphocytes, independent of their ability to
proliferate. By stimulating lymphocytes with mitogen and assaying for the
expression of IL-2R the authors were able to examine individual cells for
their activation response.
Evans, W.E. [Editor], 1974. The California gray whale. Marine Fisheries
Review, Special Number Vol 36(4): 64 pages.
March 1971 an expedition sponsored by Sea World, Inc. of San Diego, under
the direction of David W. Kenney with scientific support from the University
of California, San Diego, captured a newborn female California gray whale
(Eschrictius robustus) in Scammon's Lagoon, Baja California. Dr. Kenney's
colleagues were doubtful that a newly born gray whale could be successfully
maintained alive for more than a few months, let alone a year. Gigi II,
as the whale was known, was radio tagged and released on 13 March 1972 off
San Diego by the Naval Undersea Center (NUC) San Diego. In captivity, ultrasonography
using the A-mode technique was employed to measure blubber thickness. At
capture, she was 18'2" long and weighed 4,300 pounds and she was initially
maintained in a 55,000 gallon holding tank. Gigi began feeding after two
weeks and gained 4,200 pounds and grew to 24' long in eight months, at which
time she was transferred to a one million gallon tank. She was radiotagged
and released five miles off the California coast during the gray whale northern
migration in 1972. The radio signals were monitored until 5 May, when they
ceased; but, subsequently there were several confirmed sightings of Gigi,
and the experiment was considered a qualified success. Note:
return of a large whale to its native waters was probably successful insofar
as the whale surviving, in spite of the fact that the baby whale was released
approximately 400 miles from where it was captured a year earlier. That
the baby whale had never been near the release location was not an impediment
to its release, nor was its prolonged captivity over a very formative period
of its life. Natural instinct or the presence of migrating congeners may
have provided her the clues necessary for its survival. It is also interesting
to note that the "friendly whale" phenomenon began to be experienced
by gray whale watchers not too many years after Gigi's release. It is interesting
to speculateif her release and the phenomenon had any correlation. Presumably,after
spending virtually all of her life in captivity, Gigi was able to migrate
several thousand miles to the feeding areas of her natural population. Additional
MFR Paper 1045 in this volume by Wahrenbrock et. al. describe
studies on an earlier gray whale female calf, known as Gigi I, captured
in February 1965. Although the whale at first seemed to thrive, it died
of an uncontrollable infection about two months after it was captured. A
tremendous amount of scientific information was gained from studies of these
two whales. It should be noted that neither a capture or a release of a
gray whale had ever been done before, nor has it been done since.
Flom, J.0. and E.J. Houk, 1979. Morphologic evidence of poxvirus in "tattoo"
lesions from captive bottlenosed dolphins. Journal of Wildlife Diseases.
Skin lesions known as "tattoos"
were observed in several captive Atlantic bottlenosed dolphins (Tursiops
truncatus) maintained at the Naval Ocean Systems Center in San Diego California.
Biopsy of typical lesions and subsequent ultrasonic examination revealed
intracytoplasmic particles with poxvirus morphology.
Flores Ochoa, L.M., 1991. Observaciones de conducta de una Orca en cautiverio en la Cuidad de Mexico.
(In Spanish). Professional Thesis, UNAM, Faculty of Sciences, Mexico, D.F.
Pp 90 + Appendices.
This professional thesis describes
behavioral, veterinary, and environmental conditions of "Keiko"
in Reino Aventura from October 1986 to November 1987. Blood parameters,
salinity and temperature conditions, behavioral observations, diet, and
his veterinary condition (including skin problems) are noted. Ambient water
temperatures varied from low of 13C in January to high of 23C in August/September.
Salinity (p.p.m.) varied from 16.0 to 30.0. Ph varied from 7.15714 to 7.33929.
And, mean chlorine concentrations (p.p.m.) varied from 0.16 to 0.26 free
chlorine, and 0.42 to 0.70 total. Total kg fish consumed per day varied
from 37 in June to 53 in October and November. Fish species consumed varied
in proportion of smelt, capelin, herring, sierra, mackerel, and occasionally
other species. The medical reports of his health indicated constant intestinal
and stomach worms, and manifesting fever, as well as papillomas on his skin.
This is an excellent background reference which documents Keiko's
health problems since at least 1986.
Flores Ochoa, L.M., 1993. The Law of the Sea and a Case of International
Marine Scientific Research. Final Paper, International Law of the Sea, Univ.
Discusses Iceland's obligation under international
law to permit the experimental release of Keiko in Icelandic waters.
Ford, J, G. Ellis and K. Balcomb, 1994. Killer Whales. UBC Press, Vancouver,
Gales, N. and K. Waples, 1993. The rehabilitation and release of bottlenose
dolphins from Atlantis Marine Park, Western Australia. Aquatic Mammals,
Nine dolphins in a socially perturbed group
were released 13 January 1992 off Perth, Australia. Three of these dolphins
were subsequently brought back into captivity; another presumably died;
and the fate of the others is unknown, although unconfirmed sightings of
radio tagged dolphins extend to January 1993 (one year). "The major
reason for the ambiguity of the results was our inability to effectively
track the dolphins whilst they were at sea." Note:
state that there are undoubtedly some aspects of this release that they
would have done differently. There were not any realistic alternatives for
this dolphin group beyond a release attempt - The commercial marine park
was closing, and efforts to relocate the dolphins to other facilities were
unsuccessful. The recaptured dolphins will be kept permanently in a large
netted enclosure at Hillary's Marina in Perth, and fed by Underwater World
Geraci, J.R. & M.C. Keyes, 1970. Veterinary medicine in the conservation
and management of marine mammal resources. Journal of the American Veterinary
Medical Association. 157:19701974.
Discusses ways in
which the veterinarian plays a role in the conservation and management of
marine mammal resources. Examples are developing more effective, long-lived
markers, assessing the factors underlying the pathologic and epizootiologic
features of disease in nataural populations, and disseminating information,
beyond the limits of professional circles, to the general public. Through
unique training, they are able to assist the conservationist in reestablishing
the integrity of the marine mammal community.
Geraci, J.R., S.A. Testaverde, D.J. St. Aubin and T.H. Loop, 1978. A
mass stranding of the Atlantic white-sided dolphin (Lagenorhynchus acutus):
a study into pathobiology and life history. Final Report to the Marine Mammal
Commission. National Technical Information Service Report No. PB289361.
Geraci, J.R., B.D. Hicks and D.J. St Aubin, 1979. Dolphin Pox: A Skin
Disease of Cetaceans. Canadian Journal of Comparative Medicine. 43: 399-404.
Poxvirus has been identified morphologically from skin
lesions in captive and free-ranging bottlenosed dolphins (Tursiops Truncatus)
and a stranded Atlantic white-sided dolphin (Lagenorhynchus acutus). The
lesions, commonly referred to as ring or pinhole lesions, appear as solitary
coalesced circular gray blemishes. Advanced ring lesions may take the form
of black punctiform stippled patterns known as "tattoos". Histologically,
the stratum externum is thickened, and there is ballooning degeneration
and eosinophilic intracytoplasmic inclusions in the stratum intermedium.
These inclusions contain virus particles which exhibit typical poxvirus
morphology. Stress, environmental conditions and general health appear to
play a major role in the clinical manifestation of dolphin pox.
Geraci, J.R., 1986. Marine Mammals (Cetacea, Pinnipedia and Sirenia),
[In] Fowler, Zoo and Wild Animal Medicine, 2nd Edition. pp:750-797.
In the husbandry section discussing environment, it is noted that cetaceans
can be maintained permanently in pools having a minimal lateral dimension
of at least two or more times the adult size and a depth of not less than
one half to two thirds the animals' length. All but freshwater cetaceans
require either natural or artificial seawater. A safe and relatively natural
salinity range is 25 to 35 parts per thousand, with a pH of 7.5 to 8.2.
The desired goals can be achieved most easily by the use of an "open"
system, whereby water is continuously discarded and replaced. Free chlorine,
maintained at levels from 0.3 up to 3.0 ppm at pH 7.6 and above is safe
and controls most bacteria. When free chlorine combines with organic matter,
harmful chloramines may be formed. Temperatures of 2 to 20C are suitable
for beluga and killer whales. Air temperature also can be critical to cetaceans.
In most cases it is the rate of change and not the ultimate temperature
that is important. "For example, one killer whale adjusted easily to
Canadian winter air temperatures of below -22C after having spent five years
in a subtropical pool in which air temperatures sometimes exceeded 40C.
It should also be pointed out that the animal was prepared for the impending
temperature change with a threefold increase in food." In the food
handling section, it is noted that only products of the finest quality (according
to human standards) should be purchased. The selection should be varied
to include high and low fat fishes. One should avoid feeding a single food
type. Mackerel has a notably short shelf life (less than four months). Thaw
fish as close to feeding as possible, in a cool room or in cool water (8C
or less). Store thawed fish whole in a closed container at cool temperature;
prepare cut fish just before feeding; discard unfed fish after 24 hours.
Whole fish should be fed whenever possible eviscerated fish has lower
nutritional value. A general food quantity guideline for young whales is
5-9% of body weight per day, old whales 2-5%. A good quality, mixed fish
diet requires little, if any supplements. As a rule of thumb, vitamin supplement
formulas should be based upon energy expenditure, not on gross weight of
animal. General all-purpose human and veterinary preparations at rate of
1 tab/150kg administered twice weekly is sufficient. If diet contains herring
additional thiamin should be given twice weekly at the rate of 25mg/kg fish.
Geraci, J.R., 1989. Clinical investigation of the 1987-88 mass mortality
of bottlenose dolphins along the U.S. Central and South Atlantic Coast.
Final Report to National Marine Fisheries Service and U.S. Navy, Office
of Naval Research and Marine Mammal Commission. Published by Wildlife Disease
Section, Department of Pathology, University of Guelph, Ontario, Canada
Over 740 bottlenose dolphins stranded along
the Atlantic coast during the 11-month period beginning June, 1987. Data
or specimens from 347 of these were available for analysis by the investigating
team. Results: pathology - those that came ashore in August and early September
1987 had a range of skin lesions (pock-like craters and pox-like lesions
- viral infection was suspected); a second type of skin lesion noted was
the sloughing of large areas of skin, exposing underlying intensely reddened
dermis (one manifestation of systemic bacterial invasion which seems to
have been the ultimate cause of death of many of the dolphins in summer.
Virology - papovavirus was detected in 4 of 12 dolphins. The virus was immunologically
related to simian virus 40. The size, shape and localization of the virus
was consistent with a reovirus identity. Bacteriology- a wide variety of
bacteria was recovered including Edwardsiella, Streptococcus, Vibrio, Pseudomonas,
Klebsiella, Acinetobacter, Bacillus, Staphylococcus and members of the Vibrio
group predominated. Overall, "geographic and temporal patterns of mortality
lacked the hallmark of infectious disease." "The accumulating
evidence led us to consider a point source contaminant as the cause of mortality."
"Levels of contaminants in the dolphins' blubber were found to be among
the highest recorded for a cetacean."... "a commentary on the
state of eastern coastal waters." But, "it is unlikely that contaminants
were the key to the event." Rather, "The circumstantial evidence
suggests that PbTx [brevetoxin produced by a dinoflagellate] is the most
probable cause of the mortality." Note:
implicate a morbillivirus in this mass die-off. A phocine morbillivirus
was detected in samples from New England since 1986, and perhaps earlier
(MMC 1994 report to Congress).
Gorzelany, J.F., 1992. The rescue, rehabilitation, and reintroduction
of an injured Atlantic bottlenose dolphin along the southwest Florida coast.
20th Annual Conference of the International Marine Animal Trainers Association,
Greenwood, A.G. and D.C. Taylor, 1985. Captive Killer Whales in Europe.
Aquatic Mammals. 11(1): 10-12
Of 32 killer whales examined
after dying in aquariums around the world, half had died of bacterial infections,
one quarter of pneumonia.
Greenwood, A.G., R.J. Harrison and H.W. Whitting, 1974 Functional and
Pathological Aspects of the Skin of Marine Mammals.In: Functional Anatomy
of Marine Mammals, vol.2 (R.J. Harrison, ed.) pp.82-89.
"Skin disease in wild cetaceans is known from a number of reports (see
below) but has rarely been accorded any importance in the ecology of these
animals. Lesions, although often multiple, are usually mild, and in stranded
animals are usually overshadowed by more serious pathological changes elsewhere.
In captive dolphins, however, skin disease is one of the major problems
facing the veterinarian. Disfigured dolphins are unacceptable in a commercial
establishment where they come in close contact with the public, who quite
rightly interpret the external appearance of the animals as reflective of
their handling and care since capture. More serious from the medical viewpoint
is that any large area of skin damage may allow entry of organisms into
the body, initiating systemic disease. Much care goes into the maintenance
of high quality water for captive cetaceans, but despite all our efforts
most dolphins live in a highly contaminated and infective environment, particularly
those in artificial seawater systems." "It is a feature of cetacean
skin that although it bleeds very readily when injured, clean superficial
wounds heal remarkably rapidly, often within 48 hours." "A considerable
number of the recognized skin conditions in dolphins, particularly in captive
T. truncatus from the Gulf of Mexico, have the appearance and behavior of
viral disease." "An incidental finding at a recent autopsy of
a young captive killer whale (Taylor and Greenwood, unpublished observations)
was a group of papillomatous lesions on the skin of the ensheathed penis,
closely resembling verracue"..."Similar lesions have been seen
on the dorsal fin of another killer whale. Such lesions appear to be benign."
Reiterating, skin disease in wild cetaceans has rarely been
accorded any importance in the ecology of these animals; and, papillomatous
lesions in killer whales appear to be benign. It appears that papilloma
exists in wild cetacean populations all over the world. The young killer
whale reported to have papilloma was from the Pacific Northwest, indicating
the virus is probably present in the wild population.
Guinet, C., 1991. Intentional stranding apprenticeship and social play
in killer whales (Orcinus orca), CanJZool(69)11:2712-2716.
Haley, D., 1970. Views on the Killer Whale Dispute. Pacific Search. 5(1):
Interviews with scientists, conservationists, killer
whale captors, and aquarium owners involved in the controversy over capturing
orcas in Puget Sound.
Haley, D., 1973. Albino Killer Whale. Sea Frontiers. 19(2), Mar./Apr.:
The life and death of "Chimo", the white
whale captured in 1970 off Vancouver Island. An all white individual killer
whale appeared off the coasts of Vancouver Island in 1924. Dr. Clifford
Carl, curator of the BC Provincial Museum collected sighting records for
more than 20 years. In 1946, a biologist sighted the white whale in a pod
of ten. In 1970, another white killer whale was reported. It was assumed
that this whale, later named "Chimo", was the offspring of the
earlier reported whale which was named "Alice". The capture of
Chimo by Bob Wright took place near the spot where the first white killer
whale was seen 47 years earlier. Chimo was estimated at five years of age,
15' and adapted to captivity. Soon after capture a yellow substance appeared
on her skin, lesions formed, and she lost weight. Examination revealed a
blood calcium deficiency. Her dose of Vitamin A was increased from 200,000
to 3,000,000 units daily, and food from 75 to 120 pounds. Diagnosed as Chidiak-Higashi
syndrome, always fatal, underlying cause dysfunction of the white blood
cells. Chimo became ill on October 28, 1972 and died five days later. Pathologist
Dr. Ken Thornton (Royal Jubilee Hospital, Victoria) indicated cause of death
streptococcal infection which developed into interstitial pneumonia. "Because
CH syndrome is inherited as a recessive trait, there must be considerable
inbreeding to bring it out. This may be a bit of evidence to support the
idea that killer whales live in the same pods through long-going family
relationships, instead of changing pods frequently."
Hewlett, K.G., 1974. The Killer Whale: A Need for Perspective. Pacific
Search. 9(1): 18-19.
Vancouver Aquarium curator argues
the importance of zoos and aquariums and of keeping killer whales captive.
Hoelzel, A.R., 1993. Genetic ecology of marine mammals. Symp. zool. Soc.
Lond. No. 66:15-32.
Three categories of application of
molecular genetics: (1) paternity testing and kinship analysis; (2) estimation
of effective population size; (3) the assessment of genetic distance between
Hoelzel, A.R., 1992. Conservation genetics of whales and dolphins. Molecular
Ecology No. 1:119-125.
Obvious geographic boundaries
correlate to genetic distance in some species, and not in others. Furthermore,
morphological variation within species can be fairly extensive without correlating
to genetic distance, or relatively minor between morphotypes that are as
genetically distinct as some species.
Hoelzel, A.R. and D.R. Bancroft, 1992. Statistical analysis of genetic
variation, In: A.R. Hoelzel (ed), Molecular genetic analysis of populations,
a practical approach. IRL Press, Oxford University Press, Oxford. pp 159-186.
Hoelzel, A.R. and G.A. Dover, 1991. Genetic differentiation between sympatric
killer whale populations. Heredity 66:191-195.
nuclear genomes and sequencing the D-loop region of the mitochondrial genome
showed very low levels of variation within populations relative to comparisons
between allopatric populations, suggesting inbreeding. The two sympatric
populations in the northeastern Pacific (resident and transient) were as
genetically distinct as North Pacific populations from a South Atlantic
Hoelzel, R., 1991. Analysis of regional mitochondrial DNA variation in
the killer whale: implications for cetacean conservation, [In] Genetic ecology
of whales and dolphins, IWC Special Issue:225-234.
Hoyt, E. 1977. Orcinus orca: Separating facts from fantasies. Oceans 10: 23-36.
A paper covering aspects of the natural history of killer whales, especially
in the Pacific Northwest and, at the same time, dispelling some myths that
earned it the name "killer" whale.
Hoyt, E., 1987. Saving Whales from Themselves. Equinox. 6(36),Nov./Dec.,p.
Story of pilot whales successfully returned to the
wild after stranding and many months in captivity could provide a model
for returning captive orcas to the wild.
Hoyt, E., 1990. Orca. The Whale Called Killer. Camden House, Ontario,
Canada, pp. 1-290.
Erich Hoyt and his colleagues spent
seven summers following orcas in the waters off northern Vancouver Island,
intent on dispelling the killer myth. First published in 1981, this revised
edition contains the latest world-catch and live-capture statistics as well
as updated records of killer whales kept captive.
Hoyt, E., 1993. The Performing Orca. Why the Show Must Stop. Whale and
Dolphin Conservation Society, London.
Erich Hoyt describes
the justifications for captivity in relation to the known natural history
of the species. (To obtain a copy, email FranC@wdcs.org.).
Hui, C.A. and S.H. Ridgway, 1978. Survivorship Patterns in Captive Killer
Whales (Orcinus orca). Bulletin. 77(2): 45-51. Southern California Academy
of Sciences, Los Angeles.
Study of causes and rates of
killer whale mortalities at established North American aquariums undertaken
by the Biosciences Dept. of Naval Ocean Systems Center, San Diego, to answer
a specific query by a congressional committee looking into the survival
of captive killer whales.
Hunter, R. Bob Hunter (column), 1974. The Vancouver Sun. October 25,
The argument against keeping killer whale captives.
Temporary sentences "putting them back" as a lesson
in conservation that aquariums could teach.
Irvine, B., 1970. Conditioning marine mammals to work in the sea. Marine
Technology Society Journal, 4(3):47-52.
Irvine, B. and R.S. Wells, 1972. Results of attempts to tag Atlantic
bottlenose dolphins (Tursiops truncatus). Cetology 13:1-5.
Isenberg, H.D. and A. Balows, 1981. Bacterial pathogenicity in man and
animals.In: The Prokaryotes [M.P. Starr, H. Stolp, H.G. Truper, A. Balowa
and H.G. Schlegel (ed)] pp. 83-122. Springer-Verlag, New York.
Jakobsson, J., 1985 Monitoring and management of the Northeast Atlantic
Herring Stocks. Canadian Journal of Fisheries and Aquatic Sciences, Vol
42 (1): 207-221.
The collapse of all the major herring
stocks in the Northeast Atlantic due to overfishing in the late 1960's and
early 1970's was undoubtedly the most striking phenomenon in the history
of the European fisheries. Figure 2. shows migration pattern of the Atlanto-Scandian
herring during a period of high stock level which suggests interrelationship
of Icelandic, Norwegian and Barents Sea stocks. Fishing catches peaked at
3.5 million tons per year in the mid-1960's, and then rapidly declined to
about 200,000 tons by 1980. The stocks are gradually increasing at present.
The killer whales which are predators on these stock(s) of
herring could also be interrelated with their movements. Satellite information
on oceanographic conditions and likely herring school locations are needed,
as well as areas where herring are likely to be to be seen to see if killer
whales are also present.
Jalakas, I., 1993. Gentle Killers. Scanorama Magazine, Sept., pp 46-52.
Popular Scandinavian article describing photo-identification
and acoustic studies of killer whales near Tysfjord, Norway by Tiu Simila,
Anna Bisther, and Hanne Strager. Roughly 360 ID's of approximately 500 whales.
"We are pleased if we see a pod ten times in a season." The same
killer whales come to Tysfjord every year. Note:
Tiu Simila in personal
communication has indicated that at least one pod of killer whales found
off the Norwegian coast has a dialect unlike the others, and more similar
to Icelandic dialect. This may be preliminary evidence of interrelationship
of these killer whales, or at least evidence of their broad distribution.
Johnston, D.G. and J. Fung, 1969. Bacterial flora of wild and captive
porpoises. Journal of Occupational Medicine. 11: 276-277.
Deaths have occasionally occurred among marine mammals held in captivity
by a Naval facility in Point Magu, California. Necropsy studies of fatal
infections among captive porpoises resulted in isolation of bacteria commonly
associated with humans (Proteus vulgaris, E. coli, and Pseudomonas earuginosa).
It was suspected the animals were being infected by contamination of pool
water by their own trainers. Conclusions regarding the source of the infection
could not be established without knowledge of the normal bacterial flora
of the wild animal and of the sea water. Specimens were cultured form several
wild porpoises upon capture and compared with cultures taken after 4-6 weeks
in captivity. Samples of seawater from 5 areas of ocean occupied by these
animals were obtained at various times. Streptococcus fecales and S. gemma
were not identified in sea water nor in newly captured animals, but were
cultured from 5 of the animals after 4-6 weeks in captivity. It seems reasonable
to conclude these organisms represent introduction of bacteria into the
environment of captive animals, presumably by human attendants entering
Johnston, D.G. and S.H. Ridgway, 1969. Parasitism in some marine mammals.
Journal of the American Veterinary Medical Association. 155: 1064-1072.
Among marine mammals in captivity at the Naval Faclity
in Point Magu, California, a variety of interesting pathologic features
have been found, including bacterial infections and parasitic lesions. Parasitism
has accounted for a major portion of the pathologic changes found in marine
mammals. Parasitic infestation has been the subject of many reports. Endoparasites
found have included a variety of cestodes, nematodes, and trematodes. The
incidence of parasitism is striking, and one cannot ignore the possible
hazards of similar parasitism to men who work within the ocean environment.
Katona, S.K., J.A. Beard, P.E. Girton, and F. Wenzel, 1988. Killer whales
(Orcinus orca) from the Bay of Fundy to the Equator, including the Gulf
of Mexico. [In, Sigurjonsson and Leatherwood, Eds. North Atlantic Killer
Whales, Journal of the Marine Research Institute Reykjavik, Vol. XI, pp
Authors suggest the existence of a small seasonally
migrating population of killer whales along the United States eastern seaboard
and possibly a year-round population south of 35N. Killer whales occur in
the Gulf of Mexico and in tropical waters (sea surface temperatures to 30C)
of the North Atlantic ocean.
Kamiya, T., T. Tobayama and M. Nishiwaki, 1979. Epidermal Cyst in the
Neck of a Killer Whale. Scientific Reports. No.31: 9394. Whales Research
Ketterer, P.J. and L.E. Rosenfeld, 1974. Septic embolic nephritis in
a dolphin caused by Staphylococcus aureus. Australian Veterinary Journal.
Fatal Staphylococcus aureus infection in an
adult dolphin (Trusiops truncatus) is described. Haematogenous spread of
infection from a subcutaneous abcess resulted in septic embolic nephritis.
Klontz, George W., 1970. Medical care of newly captured killer whales.
The Southwestern Veterinarian. Summer: 267-9.
aquatic animal veterinarian reports on the capture and post-capture management,
nutrition and immunization of the killer whale.
Lambertson, R.H., B.A. Kohn, J.P. Sundberg and C.D. Buergelt, 1987. Genital
Papillomatosis in sperm whale bulls. Journal of Wildlife Diseases. 23: 361-367.
Examination of 31 male sperm whales (Physeter catadon)
caught off the western coast of Iceland revealed three cases of genital
papillomatosis involving the unsheathed penis. One subadult and 2 sexually
mature bulls were affected. Gross lesions resembled papillomas common in
terrestrial mammalian species. Transmission electron microscopy of these
lesions revealed nonenveloped intranuclear virus particles 28-40 nm in diameter
and round to hexagonal in shape. In two cases immunoperoxidase staining
was negative for group-specific papillomavirus antigen. These findings indicate
that the spectrum of animal species affected with virus-associated genital
papillomotosis includes at least one globally distributed species of the
Leatherwood, S. and R.R. Reeves, 1982. Bottlenose dolphins (Tursiops
truncatus) and other toothed cetaceans. In: Wild mammals of North America:
Biology, management, economics (J.A. Chapman G.A. Fedlhamer,eds.), pp. 369-414.
Johns Hopkins University Press, Baltimore. 1147pp.
Linden, E., 1989. Setting free the dolphins. Whalewatcher Vol 22(1):
pp.6-7. Published by the American Cetacean Society, P.O. Box 2639, Sazn
Pedro, CA 90731.
Describes people involved in release
of "Joe" and "Rosie", a male and female bottlenose dolphins
used in Dr. John Lilly's communication experiments at Marineworld-Africa,
U.S.A. at the time based in Redwood City, CA.
Lopez, J. and D. Lopez, 1985. Killer whales (Orcinus orca) of Patagonia,
and their behavior of intentional stranding while hunting nearshore. J.Mamm.
Lubow, A., 1977. Riot in Fish Tank II. New Times. Oct.14: 36-53.
The story of the freeing of two captive dolphins in Hawaii and a discussion
of the rights of animals.
MMC Workshop, 1975. Killer Whale Workshop Report, 28 April 1975. Marine
Martineau, D., A. Legace, P. Beland, R. Higgins, D. Armstrong and L.R.
Shugart, 1988. Pathology of Stranded Beluga Whales (Delphinapterus leucas)
from the St. Lawrence Estuary, Quebec, Canada. Journal of Comparative Pathology.
From June 1983 to May 1986, 13 carcasses
of stranded beluga whales from a polluted area of the St. Lawrence River,
Canada were necropsied. High performance liquid chromatography was performed
on the brains of 3 animals to determine concentrations of benzo-a-pyrene
(BaP). Two juvenile animals had severe multisystemic lesions, one of which,
a severe necrotizing dermatitis, was associated with a Herpes-like particle.
Four adults had 5 varieties of tumors. An adult had a systemic nocardiosis
and a juvenile was affected by a non 0:1 Vibrio cholerae septicaemia. High
concentrations of BaP adducts were found in the brains analyzed. Ocurrence
of Bap adducts in the brain of 3 whales of this population coincides with
the high incidence of tumors. This and the previous finding of high concentrations
of organochlorine in the tissues of these animals suggest an important role
of industrial contanimants in the recent decrease of this population.
Mate, B., 1989a Satellite-Monitored Radio Tracking as a Method for Studying
Cetacean Movements and Behaviour. Sci. Rep Int. Whale Commn. 40:389-391.
In summer 1987, a pilot whale tagged with an Argos satellite-monitored
radio tag was tracked for 95 days in the western North Atlantic. The whale
was located 479 times by satellite during movements of at least 7,588 km
and sighted from an aircraft several times in the company of other pilot
whales. Duration of dive data were collected on 187,866 dives. Transmitter
temperature information was also sent and indicated that virtually all deep
dives occurred at night, when the whale was likely feeding on squid. Surface
resting occurred most often immediately after sunrise on a four-to seven-day
cycle. Future movement and dive information in conjunction with oceanographic
data will be important in identifying the critical habitats of whales and
understanding their behavior. Satellites offer an important new cost-effective
tool for studying whales. Note:
The technology existed as of 1989
to satellite tag released whales and track them over long distances for
significantly long periods of time. Dr. Mate has also satellite tagged Bowhead
whales and bottlenosed dolphins with good success. Addendum from Pers comm:
Two other pilot whales attached with radio tags in 1991 were sighted in
February 1994 with harnesses still attached.
Mate, B., 1989b. Watching whale habits and habitats from earth satellites.
Whalewatcher Vol 23(2):pp13-15. Published by the American Cetacean Society,
PO Box 2639, San Pedro, CA 90731.
tracking of cetaceans by satellite. Shows photograph of satellite tag on
pilot whale reported in Mate 1989a in this bibliography.
Matkin, C., 1994. The killer whales of Prince William Sound. Prince William
Sound Books, Valdez, AK.
Matkin, C. and E. Saulitis, 1994. Killer whale Orcinus orca. Report to
the US Marine Mammal Commission, unpublished 1994.
Matthews, A. (pers. comm., 1994). With respect to Keiko, comments from
former manager of Marineland, Ontario.
to Marineland, Ontario in 1983, by which time Keiko was already there. Both
Kiska (a female) and Keiko (a male) had the skin problem (papilloma?), only
Kiska was worse. The problem was cyclic, getting worse in April/May/June.
Dr. Charlie Godsell thought it might be related to photo-period, and treated
both with autovaccine. Kiska was cured, and Keiko wasn't. He was subsequently
sold to Reino Aventura for approximately $125,000 Canadian. The Hunt Brothers
of Chicago also were trying to sell a killer whale to Reino Aventura at
that time (ca. February 1985), and they unsuccessfully attempted to block
the Canadian sale through Congressional obstruction (non MMPA authorized
whale flying over US airspace). Gunnar Jonsson came to Marineland Ontario
and stayed one year to learn marine park side of business (he was son of
Jon Gunnarson of Iceland who figured prominently in orca capture business).
When questioned about the skin problem, Gunnar is alleged to have said that
they [Iceland captors] see it all of the time in wild orcas, as well as
in the ones they catch. Papillomatosis not considered a problem to the whales,
it affects only their appearance.
Mayer, Sue. 1988. A Review of the Scientific Justification for Maintaining
Cetaceans in Captivity. A Report for the Whale and Dolphin Conservation
Society. (To obtain a copy, email FranC@wdcs.org.)
Medway, W. and J.R. Geraci, 1964. Hematology of the bottlenosed dolphin
(Tursiops truncatus). American Journal of Physiology. 207(6): 1367-1370.
The hemaetology of six bottlenosed dolphins, kept in
an aquarium filled with simulated sea water, has been studied. Blood samples
were easily collected from a branch of the braclial vessels. With the exceptions
of the low total red cell count, larger mean corpuscular volume, and the
high normal eosinophil count, the other hemaetological parameters are comparable
to those of the common domestic animals.
Medway, W. and H.F. Schryver, 1973. Respiratory Problems in Captive Small
Cetaceans. Journal of the American Veterinary Medical Association. 163 (Sept
Miller, R.M. & S.H. Ridgway, 1963. Clinical experiences with dolphins
and whales. Small Animal Clinics 3: 189193.
Mooney, Jerye, 1997. Captive Cetaceans: A Handbook for Campaigners. A
Report for the Whale and Dolphin Conservation Society. (To obtain a copy,
Mori, H., 1972. Bacteria in the stomach of marine little toothed whales
(translated from Japanese). Bulletin of the Japanese Society of Scientific
Fisheries. 38: 11771183.
Muller, Kirk, and Scott (editors), 1983. Epithelial neoplasms. From Small
Animal Dermatology (Muller, Kirk, and Scott, editors), Third Edition, pp.
Cutaneous papillomas are common in canines but
rare in cats. Canine viral papillomatosis is common and caused by a DNA
papovavirus. It is contagious and has an incubation period of about 30 days,
and almost always occurs as multiple lesions. Cutaneous papillomas occur
in older dogs and cats. In cats, there is no breed or sex predilection,
but in dogs papillomas are more common in males and in cocker spaniels and
Kerry blue terriers. Note:
Both cutaneous and viral papillomas are
usually benign. Rare cases of papillomatosis have been completely unresponsive
to treatment, perhaps due to immunologic defects. Clinical management of
cutaneous papillomas may include surgical excision, cryosurgery, electrosurgery,
or observation without treatment. Canine viral papillomatosi usually undergoes
spontaneous regression within about 3 months and solid immunity follows
experimental or natural infection. Autogenous or commercially produced wart
vaccines are without documented value.
Myrick, A., P. Yochem and L. Cornell, 1988. Toward calibrating dentinal
layers in captive killer whales by use of tetracycline labels. [In] Siggurjonsson
and Leatherwood, North Atlantic killer whales, RitFisK XI: 285-296
Nakajima, M. and I. Takikawa, 1961. Swine Erysipelas in the dolphins
(translated from Japanese). Journal of the Japanese Association of Zoological
Gardens and Aquariums. 3: 69-73.
Newman, K. and H. Markowitz, 1993. Echolocation by killer whales (Orcinus
orca) while in pursuit of live fish.
Abstracts of Tenth Bienniel Conference
on Marine Mammals, Galveston, TX.
Two captive killer
whales at Marine World-Africa USA were presented with live coho salmon and
were documented to echolocate and catch the live fish. Echolocation clicks
reveal spectral energy up to 80 kilohertz. Note:
The two captive
killer whales were captured in 1969 and 1980, indicating that even long-term
captives can and will pursue, capture, and eat live fish. Providing live
fish can be considered "environmental enrichment" in captive settings.
O'Barry, R., 1988. Glimpses of the journey home. Whalewatcher Vol 22(1):
pp. 8-10. Published by the American Cetacean Society, P.O. Box 2639, San
Pedro, CA 90731.
Chronicles release of "Joe"
and "Rosie" from 19 Feb to 15 July 1987. On 13 July, "The
gate was opened today and both dolphins swam out immediately. They first
swam approximately 300 yards up Blue Bank Creek into the marshlands. This
was the longest distance each has travelled in a straight line in more than
seven years." See also Coyle and Hickman, 1988 in this bibliography.
Olesiuk, P.F., M.A. Bigg and G.E. Ellis, 1990. Life history and population
dynamics of resident killer whales (Orcinus orca) in the coastal waters
of British Columbia and Washington State. Reports of the International Whaling
Commission (Special Issue 12): 209-248.
parameters for resident killer whales in coastal waters of British Columbia
and Washington State are presented: females have a mean life expectancy
of 50.2 years, males 29.2 years. Maximum longevity estimated 80-90 years
and 50-60 years, respectively.
Orlov, M.V., A.M. Mukhlya and N.A. Kulikov, 1988. Hormonal indices in
the bottlenosed dolphin (Tursiops truncatus) in the norm and in the dynamics
of experimental stress (translated from Russian). Zhurnal Evolyutsionnoi
Biokhimii i Fiziologii. 24: 557-563.
Prato, C.M., T.G. Akers and A.W. Smith, 1974. Serological evidence of
calicivirus transmission between marine and terrestrial mammals. Nature
(London). 249 (5954): 255.
The recent isolation of two
serotypes of San Miguel sea lion virus (SMSV) a calicivirus indistinguishable
from vesicular exanthema of swine virus (VESV), from California sea lions
(Zalophus c. californianus) and Northern fur seals (Callorhinus ursinus)
points to: (1) the widespread distribution of SMSV, and (2) the role of
marine mammals as possible reservoirs of viral diseases of terrestrial animals.
Ridgway, S.H., 1965. Medical Care of Marine Mammals. Journal of the American
Veterinary Medical Association. 147 (Nov 15): 1077-1085.
From an anatomical standpoint, the cetaceans most closely resemble cattle
internally, wheras the sea lion is more like a dog in anatomy and behavior.
Disease problems encounterd include erysipelas, diabetes, gastric ulcers,
scurvy, and pheumonia. A number of unidentified dermatoses have caused proglems.
Parasitic conditions include tapeworms, tapeworm cysts, flukes, and numerous
other parasites. Life cycles for most of the parasites of marine mammals
are unknown. Methods for various clinical procedures have been established.
Therapeutic agents that have been used include antibiotics, steroids, vitamins,
tranquilizers, and vermifuges.
Ridgway, S.H., 1979. Reported Causes of Death of Captive Killer Whales.
Journal of Wildlife Diseases. 15: 99-104.
discusses causes of captive killer whale deaths.
Ridgway, S.H. and M.D. Dailey, 1972. Cerebral and cerebellar involvement
of trematode parasites in dolphins and their possible role in stranding.
Journal of Wildlife Diseases. 8: 33-34.
(Delphinus sp.) that were found stranded near Point Magu, California between
1966 and 1970 were geven complete necropsy examinations. In all seven cases
a similar pathological picture was observed. The findings included adult
trematodes in the bile and pancreatic ducts, severe liver damage, and massive
brain necrosis due to the presence of numerous trematode ova in the brain
tissue. The authors suggest that the stranding and subsequent deaths of
all 7 animals resulted from this disease.
Ridgway, S.H. and C.A. Fenner, 1982. Weight-length relationships of wild
caught and captive Atlantic bottlenose dolphins. Journal of the American
Veterinary Medical Association. 181: 13101315.
and weight mesurements were obtained on 144 Atlantic bottlenosed dolphins
. Data were compared for wild-caught dolphins (n = 124), dolphins in training
(n = 34), and dolphins that had died in an emaciated condition (n = 15).
The purpose of the study was to establish guidelines for use in estimating
when a dolphin is over- or underweight. Regression lines were plotted to
give the minimal aceptable weight for any length from 185 to 265 cm.
Ridgway, S.H. and D.G. Johnston, 1965. Two interesting diseases cases
in wild cetaceans. American Journal of Veterinary Residents. 26: 771-775.
A Pacific common dolphin, (Delphinus bairdi) stranded
on a beach was found to be infested with larval tapeworm cysts, Phyllobothrium
delphini. These cysts ranged from 2 to 25 mm in diameter and were found
in the fat, muscle , and peritoneum of the lower abdomen. Unidentified ova
were found in several cerebral and cerebellar abscesses. These ova and assoiated
lesions apparently caused spatial disorientation and eventually death. An
emaciated young Pacific white-sided dolphin, (Lagenorrynchus obliquedens)
was captured after it had spent 2 weeks in a small boat harbor. It was kept
in captivity for 4 days, while it was treated with antibiotics and multiple
vitamin preparations. It died as a result of fish filling the rumen and
esophagus, thus causing pressure against the air passages and resulting
in death due to choking. Numerous gastric ulcers, which may have caused
the inability to digest fish, were found at necropsy.
Robson, Frank D., 1984. Strandings. The Science Press, Johannesburg,
South Africa, pp. 124.
This paper discusses strandings,
rehabilitation efforts, and cites many examples of successful reintroductions
in New Zealand and Australia.
Rudloe, Jack and Ann, 1994. Sea Turtles: In A Race for Survival. National
Geographic. 185(2): 94-120. Note:
Turtle No. 79 was tracked by telemetry
for 2,728 miles before her signal faded out.
Schroeder, J.P., J.G. Wallace and M.B. Cates, 1985. An infection of Vibrio
alginolyticus in an Atlantic bottlenose dolphin housed in an open ocean
pen. Journal of Wildlife Diseases. 21: 437-438.
male Atlantic bottlenosed dolphin (Tursiops truncatus) had a history of
recurring skin problems. Culture taken from the ulcerated lesions yielded
Vibrio alginolyticus. Treatment of skin with antibiotics continued for 13
weeks until all skin cultures were negative. Species of Vibrio have been
found as normal inhabitants of newly captured small cetaceans. The potential
for human acquistion of infections of Vibrio exists.
Sergeant, D., (1969). Feeding rates of Cetacea. FiskDirSkrSerHavUnders.
Shotts, Jr., Emmett B., Wayne Jones and F. Deborah Talkington, 1979.
A Study of Bacterial Flora Associated with the Spiracle of Captive Dolphins.
From Aquatic Animal Medicine: A State of the Art. Proceedings of a conference
held April 25, 1979 at Whitney Hall, Marineland of Florida, p. 111.
A study was made of the microflora associated with the spiracles of a group
of twenty captive dolphins. Results showed Coagulase positive Staphylococci
(60%) was the most common organism isolated. Other organisms included alpha
streptococci (2.5%), Pseudomonas aeruginosa (5%), Pseudomonas putrifaciens
(5%), Corynebacteria (2.5%), and Candida spp (47%).
Simila, T., 1991. Killer whales in Lofoten and Vestralen Islands 1990.
A report to the College of Fisheries Science, Tromso University, Norway.
Sigurjonsson. J., 1992, et. sequitur. A note on proposal to re-introduce
a killer whale into Icelandic coastal waters. Memorandum to the Minister
of Fisheries, Iceland, 27 April 1992.
"1) From the
point of view of the status of the stock, there is nothing that would justify
a transfer of a single animal from an aquarium abroad into the sea around
Iceland. The population is far from being threatened and numbers locally
at least in the high hundreds, and in Icelandic and adjacent waters most
likely in the range of 6,000 animals." "2) Killer whales are being
claimed to be extremely "social" creatures, living in relatively
stable social units, called pods. We have been able to identify at least
6 separate pods of killer whales, that number up to 31 known individual
animals (plus some additional "unknown" ones) each." "...if
the pod phenomenon has some major significance to the wellbeing of the animal,
the likelihood of the animal to suffer from not finding its family is quite
great if now put free into the wild." "3) ... The animal has thus
spent more than half its life in captivity and has been deprived very important
years of learning in the wild, both before and after puberty, which may
strongly influence its ability to survive in the wild." "4) ...
it should be pointed out that in general, transfer of animals from one geographical
area (or ecosystem) to another is of major concern within the marine sciences,
particularly in relation to mariculture." "In conclusion, a transfer
of the killer whale in question [Tillicum] seems not to be advisable when
considering the status of the stock off Iceland, the risk of difficulties
the animal may meet in the unprotected wild environment, and the potential
consequences of the introduction of the animal into the marine environment
off Iceland." Note:
This memo is on file at the National Marine
Fisheries Service, Office of Protected Species in a dossier on the Sea World
permit application for a killer whale named "Tillicum", which
was imported into the US on an emergency basis and later changed to "public
display". The NMFS had allowed the emergency importation only on the
condition that if a public display permit were not issued, he would be re-exported
to Canada or returned to his native waters in Iceland. Essentially an identical
letter was prepared by Sigurjonsson for a proposal to reintroduce "Ulises"
from Barcelona (also imported to the US by Sea World on 9 February, 1994).
We got the distinct feeling that Iceland does not wish to 'humanize' a whale
by allowing import of a movie star like Keiko, but the reasoning for rejection
was not supported by any scientific evidence.
Sigurjonsson, J. & S. Leatherwood (Eds.), 1988. North Atlantic Killer
Whales. (Special issue of Rit Fiskideildar). Vol.11: 1-316. Reykjavik, Iceland
Marine Research Institute.
Twenty-one papers on killer
whales in the North Atlantic based on a 1987 workshop held in Provincetown,
Mass. Some individual articles are listed and annotated elsewhere in this
This was the first concentrated attempt to evaluate
the species in the North Atlantic, particularly around Iceland, where they
continue to be sought for the world's aquariums.
Singh and Gupta, 1985. Antiviral efficacy of homeopathic drugs against
animal viruses. Division of Virology, Central Drug Research Inst, India.
The British Homeopathic Journal, 74:
Skoch, E.J., 1990. Heavy metals in marine mammals: presence and analytical
methods. [In] l.A. Dierauf (Ed.), Handbook of marine mammal medicine: Health
Disease and Rehabilitation, CRC Press, Boca Raton. pp. 127-137.
The physiologic and anatomic differences from terrestrial animals that exist
in marine mammals (compartmentalized kidneys, blubber layers, adaptations
for deep diving), as well as the fact that there is relatively little accumulated
data on normal marine mammal levels of toxic metals available, pose great
problems in interpretation of analytical results and determination of toxic
levels. A major source of contamination besides water is food. The wild
marine mammal does not feed on exactly the same food source every day, so
the animal may actually be exposed to fewer metals over a period of time
than the captive animal, which receives relatively the same food source
every day and thereby has the potential for exposure to a much heavier dosage
of metals over time. Making the food metal data a part of the animal's health
record may help prevent chronic or long-term poisoning in an animal. Note:
This is a reasonable counter-argument to the notion that marine mammals
do not do well in the wild due to pollution, etc. The food for captive marine
mammals comes from the wild. For the reasons given, it should be checked
by a laboratory before feeding to captive animals.
Small, R. and D. DeMaster, 1995a. Survival of five species of captive
marine mammals. Marine Mammal Science 11(2):209-226.
in captivity was calculated for 1707 bottlenose dolphins (BD), 72 killer
whales (KW), 73 white whales (WW), 3,090 California sea lions (CSL), and
47 Steller sea lions(SSL) based on data in the Marine Mammal Inventory Report
(MMIR) of the NMFS. Mean annual survival rates (ASRs) between 1988 and 1992
were 0.951, 0.937, and 0.954 for BD, KW, and WW, respectively, and 0.952
and 0.969 for CSL and SSL, respectively. These estimates represent significant
increases in survival for both BD and CSL over the last 5 yr. Using all
of the MMIR data (1940-1992), the ASR of BD calves (<1yr of age) was
significantly less than the ASR of non-calves (0.666 vs 0.946, P,<0.0001).
Survival of captive-born CSL was significantly higher than those born in
the wild (0.962 vs 0.945, P = 0.003), but the difference was not significantly
different for BD (0.948 vs 0.944, P = 0.60). For non-calf BD and KW, captive
animals survived at a slightly lower rate (BD 0.944 vs 0.961, P = 0.07;
KW 0.938 vs 0.976 P < 0.001) than animals in the wild (BD: Wells and
Scott 1990, KW: Olesiuk et. al. 1990). Survival of captive non-pup SSL was
slightly higher (0.968 vs 0.930) than animals in the wild (York 1994, life
table analyses). Survival rates were significantly different among institutions
bor BD calves and non-calves, CSL pups and non-pups, and SSL non-pups. Note:
Perhaps the most relevant finding was that: "Survival of the wild population
Olesiuk et al. studied, based on approximately 250 non-calves, was significantly
higher than our estimates for non-calf captive killer whales (0.976 vs.
Small, R. and D. DeMaster, 1995b. Acclimation to captivity: a quantitative estimate based on survival of
bottlenose dolphins and California sea lions. Marine Mammal Science 11(4):510-519.
The authors compared survival in captivity over the 5-year
period between 1988 and 1992 with estimates based on data from 1965 through
1987, and found that: "Survival in captivity for killer whales (Orcinus
orca)...remained the same." The implication of the former statement
by Small and DeMaster (1995a) is that longevity for captive killer whales
is significantly less than for free-ranging killer whales, since survival
rates are significantly higher in the wild. The implication of the latter
statement by Small and DeMaster (1995b) is that survival for captive killer
whales did not improve up to 1992.
Smith, A.W. and D.E. Skilling, 1979. Viruses and virus diseases of marine mammals. Journal of the American
Veterinary Medical Association. 175: 918-920.
and several serotypes of calicivirus cause recognizable disease in marine
mammals. Pox lesions in pinnipeds are raised and proliferative and are seen
most frequently after confienment in captivity. In cetaceans, a poxvirus
is associated with a much more benign and chronic lesion called a "tattoo".
Numerous caliciviruses of differing antigenic types have been isolated from
vesicular lesions and aborted fetuses of northern fur seals and California
sea lions as well as from clinically normal and orphaned northern elephant
seal pups. An adenovirus has been isolated from a sei whale and an enterovirus
has been isolated from a gray whale.
Smith, A.W., D.E. Skilling and A.B. Latham, 1981. Isolation and identification
of five new serotypes of calicivirus from marine mammals. American Journal
of Veterinary Residents. 41: 693-694.
Five new serotypes
of calicivirus have been isolated from marine mammals. San Miguel sea lion
virus (SMSV)-8 and SMSV-10 were recovered from vesicular lesions on the
flippers of northern fur seals in the Pribilof Islands of Alaska. Serotype
SMSV-9 was isolated from a sea lion in southern California, and SMSV-11
was isolated from 2 northern fur seal pups in southern California. Serotype
SMSV-12 was also isolated in southern California from sea lion and fur seal
Smith, A.W., D.E. Skilling and S.H. Ridgway, 1983. Calicivirus-induced
vesicular disease in cetaceans and probable interspecies transmission. Journal
of the American Veterinary Medical Association. 183: 1223-1225.
A calicivirus isolated from cetaceans is a new serotype designated cetacean
calicivirus Tursiops 1 (CCV-Tur-1). It appears to have spread from an initially
infected Atlantic bottlenosed dolphin to a California sea lion, and was
then carried by the sea lion to a second facility several miles away, where
a second dolphin became infected and developed vesicular skin lesions that
eroded, leaving shallow ulcers. Cetaceans and pinnipeds belong to separate
orders, so this finding of interspecies transmission demonstates the potentially
broad host spectrum for yet another calicivirus.
Smith, A.W., D.E. Skilling, S.H. Ridgway and C.A. Fenner, 1983. Regression
of cetacean tattoo lesions concurrent with conversion of precipitin antibody
against a poxvirus. Journal of the American Veterinary Medical Association.
Tattoo lesions linked to the cetacean
poxvirus of bottlenose dolphins regressed with treatment. Two types of regression
were observed: (1) The tattoo patterns become raised and blanched, then
disappeared along with sloughing skin. (2) When an incision was made through
the tattoo lesion, the tattoo appeared in a zone around the incision. Poxviruses
removed from the raised, blanched skin lesions and the typical tattoo lesions
were reacted with dolphin serums and examined by immunoelectron microscopy.
Antibody was not detected against either of the poxvirus preparations when
the dolphins had the typical tattoo lesions. However, after the raised,
blanched lesions appeared, serums obtained during acute or convalescent
stages were positive for the virus separated from the lesions. Regression
of typical tattoo lesions was concurrent with antibody conversion.
Solorzano Velasco, J.L., 1992. Papillomatosis case in an (Orcinus orca)
IAAAM Proceedings, Volume 23, College of Veterinary Medicine, Oklahoma State
Describes arrival of "Keiko" to
Mexico City from aquarium in Canada in February 1985. In December, 1985,
"... a dark gray neoformation was observed with a coliflower surface
similar to papilloma tissue, with a slow growth, in two years its volume
did not grow more than 15 cm2, and had no apparent disturbances for the
animal. Its location was bilateral in the external surface of the pectoral
fins' foldings and it did not present any problems for the growth of the
Orca." "It has been observed that with the passing of time this
papilloma tissue increases its volume seldom. We consider that this is due
to immunological depression determined by hematology tests taken regularly
and etology, manifested by inactivity, depression and even aggressive behavior."
"New lesions have appeared in sites which involve continuous movement
as in the base of the fluke tail." "With histopathology was found
tissue and cell organization that allow the identification of this neoformation
as a tipical basal papilloma, which corresponds to the clinical image."
Immunochemistry negative to papovavirus; Electrophoresis positive with bovine,
rabbit and human papovavirus; culture isolated two viruses corresponding
with Herpes and Papovavirus; Electron Microscopy revealed intraplasmatic
particles suggesting a Papovavirus. Autovaccine attempted: first and second
inoculations good results, third and fourth inoculations contrary results.
St. Aubin, D.J. anmd J.R. Geraci, 1988. Capture and handling stress suppresses
circulating levels of Thyroxine (T4) and Triiodothyronine (T3) in beluga
whales (Delphinapterus leucas). Physiol Zool. 61: 170-175.
24 juvenile beluga whales were captured in western Hudson Bay. Seventeen
were blood sampled and released immediately, one was held in shallow water
for 15 hours before release, and six were retained in captivity for 10 weeks.
Plasma concentrations of T3 decreased markedly during the first 24 hrs after
capture, and by 2-4 days there was a similar reduction in T4. Concentrations
of both hormones remained suppressed throughout the 10 week period in captivity.
Stimulation of adrenal activity by injection of adrenocorticotropic hormone
(ACTH) resulted in a further decline in T3 after 6-12 hrs. Handling stress
was alone sufficient to produce similar changes in whales injected with
saline as a control. This study deomonstrated the acute sensitivity of thyroid
hormone balance to stress in beluga whales.
Steuer, K.L., 1989 (unpublished). A comparative institutional survey
of factors influencing mortality of cetaceans in U.S. zoos and aquaria.
Unpublished report to the Animal Protection Institute of America, International
Wildlife Coalition, and Humane Society of the United States.
Stevens, W.M., 1969. Captive Killer. Sea Frontiers, Vol 15:3, pp. 140-141.
Reports on first killer whale to be maintained in warm-water
region (Miami Seaquarium) in refrigerated tank (25 degrees cooler than air)
in May 1968. "On the rare occasions that orcas venture into subtropical
or tropical seas, they evidently make frequent dives to the cold mid-water
depths where the temperature may be 30-40 degrees below that of surface
Streitfield, M.M. and C.G. Chapman, 1976. Staphylococcus aureus infections
of captive dolphins (Tursiops truncatus) and oceanarium personnel. American
Journal of Veterinary Residents. 37: 303-305.
from blowhole and pharynx of 1 dolphin ill with a respiratory tract infection
and 31 healthy dolphins at 2 oceanariums were examined by bacteriologic
culture technique. During the same period, nasal and volar forearm skin
samples were collected from 32 healthy personnel and from the furuncle on
the forearm of 1 attendant. Coagulase-positive staphylococci were isolated
from 8 dolphins (including the ill dolphin) and from 14 persons. Staphylococci
from the dolphins were totally or partially sensitive to every antibiotic,
whereas almost all of the isolates from persons were resistant to penicillin
and ampicillin, as well as to certain other antibiotics. Note:
was concluded that, although Staphylococcus aureus could be isolated commonly
from captive dolphins, there was no evidence of cross infection between
the dolphins and the oceanarium personnel.
Stroud, Richard K. and Thomas J. Roffe, 1979. Causes of Death in Marine
Mammals Stranded along the Oregon Coast. Journal of Wildlife Diseases. 15
Sixty-eight marine mammals stranded
on the Oregon beaches were examined at necropsy. Gunshot was the primary
cause of death in 30% of the pinnipeds examined. Bacterial infections (27%)
and parasitism (27%) were also of major importance in the death and debilitation
of Oregon marine mammals. Traumatic death or debilitation other than gunshot
was observed in 11 animals (16%). Predation, starvation due to neonatal
abandonment, viral encephalitis (presumptive diagnosis), dystocia and neoplasia
were diagnosed as primary or contributory causes of stranding.
Sweeney, J.C. and S.H. Ridgway, 1975. Common Diseases of Small Cetaceans.
Journal of the American Veterinary Medical Association. 167: 533-540.
Relative mortality among captive cetaceans compared with that in the wild
populations has not been assessed. Among certain species, natural mortality
is approximately 10% of the population per year. By careful selection of
animals, good nutrition, safe environment, and a good preventative medicine
program, disease and mortality of captive cetaceans can be minimized. Cetaceans
less than 2 years old and those more than 14 years old tend to become ill
and die at a greater frequency than those within the middle age group. This
report attempts to deal with the more commonly found diseases of small cetaceans.
Information on their diagnosis, treatment and prevalence is presented by
organ or tissue primarily affected.
Summers, W.St.C., 1983. A possible case of Lobo's disease acquired in
Europe from a bottlenosed dolphin (Tursiops truncatus). Bull. Soc. Path.
Ex. 76: 777-784.
Taylor, D.C., 1971. Killer Whales, Orcinus orca, at Flamingo Park Zoo
and Cleethorpes Marineland and Zoo. International Zoo Yearbook. 11: 205-206.
Veterinarian's account of captive killer whales in England.
Details husbandry and care of killer whale imported from Seattle, Washington,
to a temporary facility in England, while awaiting transport to a permanent
home at marineland of France.
Terbush, A.D., 1993. Letter from Chief, Permits Division, Office of Protected
Species, NMFS, NOAA to Robert R. Ambridge, Ocean Reef Club, Key Largo, FL
July 12, 1993.
"Any application for the release
of captive animals must consider a number of practical contingencies as
well as scientific factors. A primary consideration is the effects of the
release on wild stocks." Release criteria which might be applicable
to dolphins: "Animals should be in good physical condition before release
and have maximum fat stores." Routine blood profiles should be run
to ensure that animals do not have medical problems." "Serum agglutination
tests should be run for pathogens that could affect wild populations."
"Animals should demonstrate an ability to feed in the wild. This would
include identification of a variety of endemic fish as a source of food,
demonstration of the ability to catch live fish, and exhibition of foraging
behavior after being presented with live fish. Animals should exhibit a
lack of behavioral focus on humans and should not exhibit performance behaviors
in the presence of humans." "A method should be in place to locate
the animals for a period of up to six months; i.e., satellite or radio tags,
or both." "Stranding networks in the area of release should be
alerted." "Procedures must be in place to recapture the animals
if there is evidence that they are not adapting successfully or if they
become nuisance animals."
Thompson, P.M. and P.S. Hammond, 1992. The use of photography to monitor
dermal disease in wild bottlenose dolphins. Ambio.
is concern that some populations of small cetaceans have declined as a result
of increases in pollution and other human activities in coastal areas. Pollution
and other environmental stresses may directly or indirectly increase the
susceptibility of dolphins and porpoises to disease. However, new oppportunities
exist to monitor the health status of cetacean populations. This paper describes
skin lesions which were observed on bottlenosed dolphins from Scottish waters
and suggests that conventional photo-identification studies could be extended
to assess the prevalence of dermal disease symptoms in cetacean populations.
Thomson, C.A. and J.R. Geraci, 1986. Cortisol, aldosterone, and leucocytes
in the stress response of bottlenosed dolphins (Tursiops truncatus). Canadian
Journal of Fisheries and Aquatic Science. 43(5): 1010-1016.
The activity associated with capturing, restraining and removing bottlenosed
dolphins (Tursiops truncatus) from water stimulates a stress response as
reflected by circulating cortisol, aldosterone, and eosinophils. Serum cortosol
increased from resting levels of about 30-110 nmol/L within one hour, aldosterone
rose from less than 280 pmol/L to up to 1800 pmol/L within three hours,
and circulating eosinophils were depressed to less than 40% of their initial
numbers within 7 hours after the animals were removed from water (calm-capture).
This basic response was not enhanced when the capture procedure was prolonged
for 3 hours (chase-capture) or when the dolphins were given acrenocorticotropic
hormone, and was similar to that observed in free-ranging dolphins after
they had been held in a net for up to 5 hours. Eosinophil numbers appear
to be a consistent and practical indicator of stress in dolphins.
Valentry, Duane, 1969. Big Star All at Sea. Sea Frontiers, Vol 15:4,
Popular article describing captive conditions
of pilot whale (Globichephala malaena) and his successful release to the
wild in 1967. Van Bressem, M.F., K. Van Waerebeek, A. Garcia-Godos, D. DeKegel
and P.P. Pastoret, 1994. Herpes-like virus in Dusky dolphin (Lagenorhyncus
obscurus) from coastal Peru. Marine Mammal Science (in press).
Documents skin lesions associated with herpes-like HSV-1 and Zoster. Mildly
pathogenic, no evidence of poor health.
Wells, R.S., 1989. Return to the wild: Completion of a "Dolphin
Sabbatical", Whalewatcher Magazine Vol 23(4); pp. 3-5. American Cetacean
society, P.O. Box 2639, San Pedro, CA 90731.
male dolphins, Echo and Misha, were captured in Tampa Bay, Florida in July
1988 "to explore the idea that dolphins might be brought into captivity
for brief periods and then released back into the wild." While in captivity,
the dolphins were used in echolocation experiments, after which they are
to be returned to the area of capture. The projected budget for the release,
radiotracking and first year of observations was $95,201. See Bassos, 1993
in this bibliography for followup thesis.
Werner, Linda, R. Halliwell and D. Buesse, 1979. Immunologic Investigation
in Dolphins with Cutaneous Candidiasis. From Aquatic Animal Medicine: A
State of the Art. Proceedings of a conference held April 25, 1979 at Whitney
Hall, Marineland of Florida (Robert L. Jenkins & Joseph G. Halusky, eds.),
Levamisole phosphate, an immune potentiating
drug, has recently proven effective in achieving regression of skin lesions
in dolphins with Candida albicans infections, which might suggest that immune
deficiency might contribute to the pathoetiology of this disease. A group
of dolphins were challenged intradermally with CA extract, resulting in
lymphocyte transformation (LT) suppression, indicating immune deficiency
may be acquired with chronic CA infection, and not necessarily a primary
or predisposing factor. Immune suppression, therefore, constituted a rationale
for the use of levamisole in conjunction with antifungal therapy. The etiology
of CA infection in dolphins is multifactorial, that altered environment
may introduce predisposing factors and that acquired immune deficiency may
account for disseminated infections refractory to conventional modalities
of therapy. Note:
Skin tests results and the increased incidence
of CA infection in artificial environments indicate that there is greater
exposure, and perhaps increased susceptibility in captivity compared to
the natural environment.
White, J.R., 1972. Thiamine deficiency in an Atlantic bottlenosed dolphin,
Tursiops truncatus, on a diet of raw fish. J. AM. Vet. Medical Assn., Vol
156, pp. 620-626.
An Atlantic bottlenosed dolphin, Tursiops
truncatus, on a diet of raw fish, developed signs of illness including prolonged
anorexia, emaciation and regurgitation. Immediate response to high amounts
of thiamine hydrochloride, administered parenterally, suggested a thiamine
deficiency. It was concluded that cetaceans on a diet of raw fish should
be given supplemental thiamine HCl in addition to that contained in most
White, J.R., 1984. Born Captive, Released in the Wild. Sea Frontiers. 30 Nov-Dec, pp.
Description of Miami Seaquarium's efforts to indroduce captive-born and
captive reared Florida manatees back to the wild. Major concern is whether
or not the animal will readily adapt to the natural foods and social interactions
of the wild herds. Two captive-born, captive-reared subadult manateees were
introduced to a large, fenced-off section of the Homosassa River for acclimation
to a natural habitat. They were to be monitored in this enclosure for one
year. Following acclimation, radio harnesses were to be attached to study
their movements and interactions with wild herds.
White, J.R. and R. Floyd., 1988. Nutritional Management of Marine Mammals.
In Proceedings, IAAAM 5, 19.
An Atlantic bottlenosed
dolphin, Tursiops truncatus, on a diet of raw fish, developed signs of illness
including prolonged anorexia, emaciation and regurgitation. Immediate response
to thiamine hydrochloride, administered parenterally, suggested a thiamine
deficiency. It was concluded that cetaceans on a diet of raw fish should
be given supplemental thiamine HCl in addition to that contained in most
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