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Effects of migration activity on the mortality rates of two Portunidae crabs in a tropical bay

Published online by Cambridge University Press:  03 March 2009

Karina Annes Keunecke ,
Demarques Ribeiro da Silva Jr ,
Marcelo Vianna ,
José Roberto Verani  and
Fernando D'Incao
Karina Annes Keunecke*
Affiliation:
Universidade Federal do Rio de Janeiro, Instituto de Biologia, Depto. Biologia Marinha, Laboratório de Biologia e Tecnologia Pesqueira, CCSBl.A, 21949-900, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
Demarques Ribeiro da Silva Jr
Affiliation:
Universidade Federal do Rio de Janeiro, Instituto de Biologia, Depto. Biologia Marinha, Laboratório de Biologia e Tecnologia Pesqueira, CCSBl.A, 21949-900, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
Marcelo Vianna
Affiliation:
Universidade Federal do Rio de Janeiro, Instituto de Biologia, Depto. Biologia Marinha, Laboratório de Biologia e Tecnologia Pesqueira, CCSBl.A, 21949-900, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
José Roberto Verani
Affiliation:
Universidade Federal de São Carlos, Depto. de Hidrobiologia, Laboratório de Dinâmica de Populações de Peixes, Caixa Postal 676, 13565-905, São Carlos, São Paulo, Brazil
Fernando D'Incao
Affiliation:
Fundação Universidade de Rio Grande, Depto. de Oceanografia, Laboratório de Crustáceos Decápodes, Caixa Postal 474, 96201-900, Rio Grande, Rio Grande do Sul, Brazil
*
Correspondence should be addressed to: K.A. Keunecke, Universidade Federal do Rio de Janeiro, Instituto de Biologia, Depto. Biologia Marinha, Laboratório de Biologia e Tecnologia Pesqueira, CCSBl.A, 21949-900, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil email: keunecke@biologia.ufrj.br
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Abstract

Callinectes danae and Callinectes ornatus are two Portunidae crabs which are an important portion of the fishing products of Guanabara Bay, but are being discarded by shrimp trawlers along the Brazilian coast. Instantaneous mortality rates Z, M, F and the exploitation rates E for both species and for both sexes were estimated. Total mortality (Z) was estimated by length-converted catch curves and natural mortality (M) was based on life history analysis where K and t0 were parameters of the von Bertalanffy growth function. Fishing mortality rates presented low values of F for males of C. danae and C. ornatus (0.27 and 0.80), but not for the females (3.29 and 16.27). These females exhibited high values of fishing mortality and elevated exploitation rates (0.64 and 0.90). These high values may be a result of intense trawling in the region and/or the migration activity of these species to other coastal areas during the reproductive period, overestimating fishing mortality.

Keywords

Callinectes danaeCallinectes ornatusGuanabara Bayby-catch
Type
Research Article
Information
Marine Biodiversity Records , Volume 2 , January 2009 , e34
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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