Estimates of marine mammal, sea turtle, and seabird bycatch in the California large-mesh drift gillnet fishery: 1990-2021

Carretta, James V.

doi:10.25923/kh19-sk22

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Estimates of marine mammal, sea turtle, and seabird bycatch in the California large-mesh drift gillnet fishery: 1990-2021

2022
By Carretta, James V.
Series: NOAA technical memorandum NMFS-SWFSC ; 671

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Personal Author:

Carretta, James V.
Corporate Authors:

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

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

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

Bycatch of marine mammals, sea turtles, and seabirds in the California thresher shark / swordfish drift gillnet fishery from 1990 to 2021 is estimated with random forest classification and regression trees. Tree estimates are compared with annual ratio estimates using the same observer data. Biases associated with ratio estimators (systematic under- and overestimation of bycatch) are notable when observed bycatch is rare, when each annual bycatch estimate is informed only by data from the same year, and observer coverage is low.
Keywords:

[+]

Southwest Fisheries Science Center, Marine Mammal and Turtle Division, bycatch, marine mammal bycatch, sea turtle bycatch, seabird bycatch, California, large-mesh drift gillnet
Series:

NOAA technical memorandum NMFS-SWFSC ; 671
DOI:

https://doi.org/10.25923/kh19-sk22
Document Type:

Technical Memorandum
Rights Information:

Public Domain
Compliance:

Submitted
Main Document Checksum:

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urn:sha256:f1296740eb6d318e0328f13445b79209c0ef01aa83577d959d326d125be14369
Download URL:

https://repository.library.noaa.gov/view/noaa/47167/noaa_47167_DS1.pdf
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Estimates of marine mammal, sea turtle, and seabird bycatch in the California large-mesh drift gillnet fishery: 1990-2021

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