Gillnet selectivity for juvenile blacktip sharks (Carcharhinus limbatus)

Baremore, Ivy E. and Berthea, Dana M. and Andrews, Kate I. (2012) Gillnet selectivity for juvenile blacktip sharks (Carcharhinus limbatus). Fishery Bulletin, 110(2), pp. 230-241.

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Official URL: http://fishbull.noaa.gov/1102/baremore.pdf

Abstract

Gillnet mesh selectivity parameters were estimated for juvenile blacktip sharks (Carcharhinus limbatus) by using length data from an experimental fishery-independent gillnet survey in the northeastern Gulf of Mexico. Length data for 1720 blacktip sharks were collected over 17 years (1994–2010) with seven mesh sizes ranging from 7.6 to 20.3 cm. Four selectivity models, a normal model assuming fixed spread, a normal model assuming that spread is proportional to mesh size, a lognormal model, and a gamma model were fitted to the data by using the SELECT (share each length’s catch total) method. Each model was run twice under separate assumptions of 1) equal fishing intensity; and 2) fishing intensity proportional to mesh size. The normal, fixed-spread selectivity curve where fishing intensity is assumed to be proportional to mesh size provided the best fit to the data according to model deviance estimates and was chosen as the best model. Results indicate that juvenile blacktip sharks are susceptible as bycatch in some commercial gillnet fisheries.

Item Type: Article
Title: Gillnet selectivity for juvenile blacktip sharks (Carcharhinus limbatus)
Personal Creator/Author:
CreatorsEmail
Baremore, Ivy E.
Berthea, Dana M.
Andrews, Kate I.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 110
Number: 2
Page Range: pp. 230-241
Date: April 2012
ISSN: 0090-0656
Subjects: Biology
Ecology
Fisheries
Item ID: 8677
Depositing User: Patti M. Marraro
Date Deposited: 05 Jun 2012 13:32
Last Modified: 05 Jun 2012 13:32
URI: http://aquaticcommons.org/id/eprint/8677

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