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  • 1
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    Post mortem studies of sea otters, Enhydra lutris L., in California (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/683 | 8 | 2011-09-29 21:41:42 | 683 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-02
    Description: Dead sea otters found on or near beaches in central California from January 1968 through June 1974 were collected for study. Necropsies were conducted on many of these carcasses. Sea otter mortalities are related to: (1) area of recovery; (2) sex; (3) relative age; (4) general cause of death; and (5) sea surface roughness.Selected specific aspects of necropsies are summarized. Tables for estimating weight from total length and estimating total length from tail length and foot length are given. Organ weights are discussed. Criteria for establishing relative age based on degree of fusion of cranial sutures, eruption and wear of dentition, and development of the glenoid fossa are given. A method of estimating relative age of male otters is given based onbaculum length or volume.Methods useful for sexing dissociated skeletal remains basedon osteological differences in pelves are presented.(87pp.)
    Keywords: Health ; Biology ; sea otters ; Enhyrda lutris L. ; California ; post mortem
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
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  • 2
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    A report on the sea otter, Enhydra lutris L., in California (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/674 | 8 | 2011-09-29 21:42:26 | 674 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-01
    Description: This report discusses in detail findings and observationsof 5 years of research on the sea otter population and itsrelationship to the nearshore marine environment in California. Initial efforts were directed at providing some relief to the commercial abalone fishery in the Cambria - Point Estero area north of Morro Bay. This fishery has subsequently collapsed along with other commercial and sport abalone and sport crab fisheries throughout the sea otter's range due to continued sea otter foraging. Capturing, tagging and translocation studies, censusing studies, examination of sea otter remains, habitat surveys, food habits observations and studies on otters in captivity provide a broad base of information on the expandingsea otter population in California and its effects onresources utilized by man. Recommendations for sea ottermanagement consistent with esthetic, recreational, and commercial uses of marine resources are included in this report. (95pp.)
    Keywords: Management ; Biology ; sea otter ; Enhydra lutris ; California ; Estero Bay ; Monterey Bay
    Repository Name: AquaDocs
    Type: monograph
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  • 3
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    An assessment of the accidental take of sea otters, Enhydra lutris, in gill and trammel nets (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/721 | 8 | 2011-09-29 21:39:12 | 721 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-02
    Description: The sea otter, Enhydra 1utris, is fully protected inCalifornia by both state and federal law. Despite thisprotection the population has not grown appreciably since atleast 1976. Research efforts directed at identifying thereasons for the lack of population growth have concentratedon sources of mortality and their contribution to totalmortality.The accidental drowning of sea otters in gill and trammelnets used to take California halibut, Para1ichthysca1ifornicus, was identified as a source of mortality whichhas probably increased as the sea otter population expandedinto areas of intense fishing. As a result, an existinggill and trammel net fishery observation program in MontereyBay was expanded to assess the extent and significance ofthe accidental drownings of sea otters in the areas nearMorro Bay and Port San Luis.Three different estimates of the number of sea ottersdrowned annually in gill and trammel nets were generatedusing comparable data bases. The average of these estimateswas approximately 80 sea otters per year for the level offishing effort expended during the June 1982 through June1984 study period.Back calculations of the annual take of sea otters by thegill and trammel net fishery for California halibut weremade for each year from 1973 through 1983. Thesecalculations suggest that the level of accidental take ofsea otters during the last decade may have been high enoughto be a significant factor in the lack of sea otterpopulation growth. (31pp.)
    Keywords: Fisheries ; Biology ; Sea otter ; Enhydra lutris ; California ; gill net ; trammel net
    Repository Name: AquaDocs
    Type: monograph
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  • 4
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    A simulated translocation of sea otters, Enhydra lutris, with a review of capture, transport and holding techniques (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/719 | 8 | 2011-09-29 21:41:01 | 719 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-02
    Description: A number of techniques and pieces of equipment judged necessary for the translocation of sea otters were field tested. Captures were accomplished with either a scuba diver operated capture device (Wilson trap), a surface set tangle net or a dip net. A portable floating pen proved verysatisfactory for simultaneously holding at least ten otters for several days. Commercially available pet transport kennels, with the capability of holding water, were adequate for maintaining the otter's pelage in good condition during a transport of approximately five hours duration. Subsequent observations indicated no apparent stress related dispersal. (17pp.)
    Keywords: Biology ; Sea otter ; Enhydra lutris ; transport ; California
    Repository Name: AquaDocs
    Type: monograph
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  • 5
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    A review of California sea otter, Enhydra lutris, surveys (2021)
    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/718 | 8 | 2011-09-29 21:41:32 | 718 | California Department of Fish and Game
    Details
    Publication Date: 2021-07-02
    Description: Recent surveys (1977 to 1983) of the sea otter, Enhydra lutris, in California were summarized and compared to past surveys, to evaluate the adequacy of current survey design and to-make inferences about current population status.Ground counts within selected index areas provided the bestindicator of population trends. These data suggest a ratherremarkable stability in the long-term occupied range. Rangewide aerial surveys with ground truth stations provided the best available data for estimating total population size. The most recent (1979) survey yielded a population estimate of approximately 1500 sea otters. Comparisons with past surveys suggest there have been no demonstrable changes in population size since at least 1976. (34pp.)
    Keywords: Biology ; Sea otter ; Enhydra lutris ; California
    Repository Name: AquaDocs
    Type: monograph
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  • 6
    Electronic Resource
    Electronic Resource
    ANALYSIS OF SEA OTTER, ENHYDRA LUTRIS, SCATS COLLECTED FROM A CALIFORNIA HAULOUT SITE (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 2 (1986), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.1986.tb00042.x
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