Pelagic observer program data summary, Gulf of Mexico bluefin tuna (Thunnus thynnus) spawning season 2007 and 2008; and analysis of observer coverage levels

Beerkircher, Lawrence; Brown, Craig A.; Restrepo, Victor

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Pelagic observer program data summary, Gulf of Mexico bluefin tuna (Thunnus thynnus) spawning season 2007 and 2008; and analysis of observer coverage levels

2009
By Beerkircher, Lawrence ; Brown, Craig A. ; Restrepo, Victor
Series: NOAA technical memorandum NMFS SEFSC ; 588

[PDF-897.39 KB]

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Personal Author:

Beerkircher, Lawrence ; Brown, Craig A. ; Restrepo, Victor

Beerkircher, Lawrence ; Brown, Craig A. ; Restrepo, Victor Less -
Corporate Authors:

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

NMFS (National Marine Fisheries Service) ; SEFSC (Southeast Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; SEFSC (Southeast Fisheries Science Center) Less -
Description:

The Atlantic Bluefin tuna, Thunnus thynnus, is a large apex teleost that inhabits the pelagic environment in temperate and subtropical waters of the North Atlantic. While the species engages in long seasonal migrations throughout its range, it is believed that two major stocks exist, one in the eastern Atlantic and Mediterranean and one in the western Atlantic and Gulf of Mexico (Block et al., 2005). In the west, spawning activity is concentrated in the Gulf of Mexico during April, May, and June (Mather et al., 1995). The decline of both Eastern and Western stocks of Atlantic bluefin tuna has been well documented and the species is subject to major rebuilding efforts (ICCAT, 2007). Part of the rebuilding effort has been to increase the amount of information known about the basic biology of bluefin tuna, as well as collecting robust information regarding fisheries catch and bycatch. In the spring of 2007, and again in the spring of 2008, the National Marine Fisheries Service (NMFS) conducted enhanced observer coverage of the U.S. pelagic longline fleet operating in the Gulf of Mexico (GOMEX) in order to accurately quantify and characterize bluefin tuna bycatch in this fishery during spawning season, as well as collect biological samples to support various research into bluefin tuna age and growth, maturity, and reproduction. Here we provide background information on the GOMEX longline fishery and the summary statistics of the observer data collected during bluefin tuna spawning season coverage in 2007-2008; as well as analyses of levels of observer coverage needed to provide bycatch estimates of various precisions.
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Bluefin Tuna Fishery Management
Series:

NOAA technical memorandum NMFS SEFSC ; 588
Document Type:

Technical Memorandum
Place as Subject:

Mexico, Gulf of
Rights Information:

Public domain
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urn:sha256:88abbf12ed8f45e69a38074968424e404c39555c36f9ae596be4a43a88bbff80
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https://repository.library.noaa.gov/view/noaa/30885/noaa_30885_DS1.pdf
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Pelagic observer program data summary, Gulf of Mexico bluefin tuna (Thunnus thynnus) spawning season 2007 and 2008; and analysis of observer coverage levels

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