Marine mammal and sea turtle bycatch in the California/Oregon thresher shark and swordfish drift gillnet fishery in 2006

Carretta, James V.; Enriquez, Lyle

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Marine mammal and sea turtle bycatch in the California/Oregon thresher shark and swordfish drift gillnet fishery in 2006

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Personal Author:

Carretta, James V. ; Enriquez, Lyle
Corporate Authors:

Southwest Fisheries Science Center (U.S.)
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center)
Description:

Marine mammal and sea turtle bycatch in the California/Oregon large mesh drift gillnet fishery for thresher shark and swordfish is summarized for calendar year 2006. Observer coverage for 2006 was 18.5%, based on 266 observed fishing sets and an estimated 1,433 sets fished by all vessels. Observed bycatch totals were six short-beaked common dolphin (Delphinus delphis), one long-beaked common dolphin (D. capensis), twelve California sea lions (Zalophus californianus) and one loggerhead sea turtle (Caretta caretta). All marine mammals were dead upon retrieval, and the sea turtle was released alive. Estimated bycatch is 32 (CV = 0.52) short-beaked common dolphin; 5 (CV = 1.04) long-beaked common dolphin; 64 California sea lions (CV = 0.43); and 5 loggerhead sea turtles (CV = 1.11). Of the five estimated loggerhead turtle entanglements, only one mortality is predicted, based on the observed fraction of loggerhead turtles (81%) released alive in this fishery.
Content Notes:

James V. Carretta and Lyle Enriquez.

System requirements: Adobe Acrobat Reader.

Includes bibliographical references (page 5).
Keywords:

Bycatches Bycatches (Fisheries) California Sea Lion Common Dolphin Estimates Gillnetting Loggerhead Turtle Marine Mammals Mortality Sea Turtles Shark Fisheries Swordfish Fisheries California Sea Lion Common Dolphin Loggerhead Turtle Marine Mammals Sea Turtles Shark Fisheries Swordfish Fisheries
Series:

Administrative report LJ 07-06
Document Type:

Administrative Report
Place as Subject:

California ; Pacific Coast ; Oregon
Rights Information:

Public Domain
Compliance:

Library
Main Document Checksum:

urn:sha256:3ec72d57a4ccf68972e64bfe2491b0a04c6e77f79ebd8c47b14d5114669b6555
Download URL:

https://repository.library.noaa.gov/view/noaa/4675/noaa_4675_DS1.pdf
File Type:

[PDF - 101.90 KB ]

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