Estimated Loggerhead (Caretta caretta) interactions in the Mid-Atlantic scallop dredge fishery, 2009-2014

Murray, Kimberly T.

doi:10.7289/V5GT5K5W

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Estimated Loggerhead (Caretta caretta) interactions in the Mid-Atlantic scallop dredge fishery, 2009-2014

2015
By Murray, Kimberly T.
Series: Northeast Fisheries Science Center reference document ; 15-20

[PDF-746.79 KB]

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Details:

Personal Author:

Murray, Kimberly T.
Corporate Authors:

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

NMFS (National Marine Fisheries Service) ; NEFSC (Northeast Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; NEFSC (Northeast Fisheries Science Center) Less -
Description:

This paper estimates total loggerhead (Caretta caretta) turtle interactions, adult equivalent interactions, and mortality in the Mid- Atlantic sea scallop (Placopecten magellanicus) dredge fishery from 2009-2014 using data collected by the Northeast Fisheries Observer Program. During this time period, some vessels were equipped with chain mats and turtle deflector dredges designed to exclude turtles from being captured in the dredge bag or cutting bar frame , rendering many interactions to be "unobservable." As a result, observer data from 2009-2014 were pooled with data from 2001-2008 to estimate observable and unobservable yet quantifiable interactions. A Generalized Additive Model was developed describing intera ction rates as a function of sea surface temperature, chain mats, depth, and year, and was then applied to commercial Vessel Trip Report data to estimate total loggerhead interactions. The average annual observable turtle interactions in the Mid-Atlantic scallop dredge fishery plus unobserved, quantifiable interactions was 22 loggerheads per year (coefficient of variation = 0.73, 95% confidence interval: 4-67 ) , 9 -19 of which were lethal. The 22 interactions equate to 2 adult equivalents per year and 1-2 adult equivalent mortalities. Estimated interactions in the fishery have decreased relative to 2001-2008, and the utility of observers as a monitoring tool for turtle interactions in the fishery appears to be decreasing. [doi:10.7289/V5GT5K5W (http://dx.doi.org/10.7289/V5GT5K5W)]
Content Notes:

by Kimberly T. Murray.

"Web version posted September 18, 2015"--Document's home page: http://www.nefsc.noaa.gov/publications/crd/crd1520/

"September 2015."

doi:10.7289/V5GT5K5W (http://dx.doi.org/10.7289/V5GT5K5W)

System requirements: Adobe Acrobat Reader.

Includes bibliographical references (page 9).
Keywords:

[+]

Bycatches (Fisheries) Conservation Effect Of Fishing On Endangered Species Environmental Aspects Equipment And Supplies Fisheries Fishery Management Fish Stock Assessment Loggerhead Turtle Management Monitoring Mortality Scallop Fisheries
Series:

Northeast Fisheries Science Center reference document ; 15-20
DOI:

http://doi.org/10.7289/V5GT5K5W
Document Type:

Miscellaneous
Place as Subject:

Atlantic Coast (U.S.) ; Mid-Atlantic Bight

Atlantic Coast (U.S.) ; Mid-Atlantic Bight Less -
Rights Information:

Public Domain
Compliance:

Library
Main Document Checksum:

[+]

urn:sha256:a1b3d08b2f6240d0c505cd6ef9caac12c6fca68b0c4eb6d7126c703286df4911
Download URL:

https://repository.library.noaa.gov/view/noaa/5046/noaa_5046_DS1.pdf
File Type:

Document's home page

htm

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