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Reproductive strategies of two sympatric swimming crabs Callinectes danae and Callinectes ornatus (Crustacea: Portunidae) in an estuarine system, south-eastern Brazil

Published online by Cambridge University Press:  21 April 2011

K.A. Keunecke ,
F. D'Incao ,
J.R. Verani  and
M. Vianna
K.A. Keunecke*
Affiliation:
Departamento de Biologia Animal, Instituto de Biologia, Universidade Federal Rural do Rio de Janeiro, BR 465 km 7, Cidade Universitária, Seropédica, Rio de Janeiro, 23890-000, Brazil
F. D'Incao
Affiliation:
Fundação Universidade de Rio Grande, Departamento de Oceanografia, Laboratório de Crustáceos Decápodes, Caixa Postal 474, 96201-900, Rio Grande, Rio Grande do Sul, Brazil
J.R. Verani
Affiliation:
Universidade Federal de São Carlos, Departamento de Hidrobiologia, Laboratório de Dinâmica de Populações de Peixes, Caixa Postal 676, 13565-905, São Carlos, São Paulo, Brazil
M. Vianna
Affiliation:
Universidade Federal do Rio de Janeiro, Instituto de Biologia, Departamento de Biologia Marinha, Laboratório de Biologia e Tecnologia Pesqueira, CCS-Bl.A, 21949-900, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, Brazil
*
Correspondence should be addressed to: K.A. Keunecke, Departamento de Biologia Animal, Instituto de Biologia, Universidade Federal Rural do Rio de Janeiro, BR 465 km 7, Cidade Universitária, Seropédica, Rio de Janeiro, 23890-000, Brazil email: [email protected]
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Abstract

The present study analysed the reproductive biology of Callinectes danae and Callinectes ornatus, which are captured as by-catch from pink-shrimp trawling in Guanabara Bay. The size at gonadal maturity was 79.9 mm and 67.4 mm respectively, for C. danae and C. ornatus. The pattern of reproduction was continuous for both species; however, the gonadosomatic index analyses showed seasonal and alternating reproductive peaks in the bay. While C. danae showed reproductive peaks in the autumn and in the winter, C. ornatus showed an apparent reproductive peak in the summer and probably another in the spring. The sex-ratio of C. danae was significantly skewed in favour of females (3.0:1). However, in C. ornatus, males predominated (1.2:1). This reproductive pattern indicated that possibly the females of C. danae return to the estuary after spawning where trawling takes place, while ovigerous females of C. ornatus migrate to adjacent coastal areas around the bay.

Keywords

by-catchGuanabara BayDecapodareproductionsize at gonadal maturitysex-ratio
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 92 , Issue 2 , March 2012 , pp. 343 - 347
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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