An assessment of the accidental take of sea otters, Enhydra lutris, in gill and trammel nets

Wendell, Frederick E. and Hardy, Robert A. and Ames, Jack A. (1986) An assessment of the accidental take of sea otters, Enhydra lutris, in gill and trammel nets. Long Beach, CA, California Department of Fish and Game, (Marine Resources Technical Report, 54)

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Abstract

The sea otter, Enhydra 1utris, is fully protected in California by both state and federal law. Despite this protection the population has not grown appreciably since at least 1976. Research efforts directed at identifying the reasons for the lack of population growth have concentrated on sources of mortality and their contribution to total mortality. The accidental drowning of sea otters in gill and trammel nets used to take California halibut, Para1ichthys ca1ifornicus, was identified as a source of mortality which has probably increased as the sea otter population expanded into areas of intense fishing. As a result, an existing gill and trammel net fishery observation program in Monterey Bay was expanded to assess the extent and significance of the accidental drownings of sea otters in the areas near Morro Bay and Port San Luis. Three different estimates of the number of sea otters drowned annually in gill and trammel nets were generated using comparable data bases. The average of these estimates was approximately 80 sea otters per year for the level of fishing effort expended during the June 1982 through June 1984 study period. Back calculations of the annual take of sea otters by the gill and trammel net fishery for California halibut were made for each year from 1973 through 1983. These calculations suggest that the level of accidental take of sea otters during the last decade may have been high enough to be a significant factor in the lack of sea otter population growth. (31pp.)

Item Type: Monograph or Serial Issue
Title: An assessment of the accidental take of sea otters, Enhydra lutris, in gill and trammel nets
Personal Creator/Author:
CreatorsEmail
Wendell, Frederick E.
Hardy, Robert A.
Ames, Jack A.
Series Name: Marine Resources Technical Report
Number: 54
Date: 1986
Publisher: California Department of Fish and Game
Place of Publication: Long Beach, CA
Issuing Agency: California Department of Fish and Game
Uncontrolled Keywords: Sea otter; Enhydra lutris; California; gill net; trammel net
Subjects: Fisheries
Biology
Item ID: 721
Depositing User: Joan Parker
Date Deposited: 23 Feb 2008 14:25
Last Modified: 29 Sep 2011 21:39
URI: http://aquaticcommons.org/id/eprint/721

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