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Reproductive cycle of the swimming crab Portunus spinimanus Latreille (Crustacea, Decapoda, Brachyura) from Ubatuba, São Paulo, Brazil

Abstract

This study analyses some reproductive aspects of Portunus spinimanus Latreille, 1819, a crab usually commercialized in Ubatuba region. Monthly otter-trawl collections were taken for two years along the northern coast of São Paulo State, Brazil. The reproductive period was studied based on the frequency of ovigerous females in the population along the year; the frequency of physiologically mature swimming crabs and the type of spawn. The condition of development of ovigerous females ovary was associated with the stage of eggs development. This species presents continuous reproduction in Ubatuba region and total spawn, but with successive broods, which suggests a multiple spawn during the reproduction period.

Portunus spinimanus; reproduction; spawn; Brazilian coast


Reproductive cycle of the swimming crab Portunus spinimanus Latreille (Crustacea, Decapoda, Brachyura) from Ubatuba, São Paulo, Brazil

Sandro SantosI,III; Maria Lucia Negreiros-FransozoII,III

IDepartamento de Biologia, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria. 97105-900 Santa Maria, Rio Grande do Sul, Brasil

IIDepartamento de Zoologia, Instituto de Biociências, Centro de Aquicultura, Universidade Estadual Paulista. 18618-000 Botucatu, São Paulo, Brasil

IIINEBECC, Group of Studies on Crustacean Biology, Ecology and Culture

ABSTRACT

This study analyses some reproductive aspects of Portunus spinimanus Latreille, 1819, a crab usually commercialized in Ubatuba region. Monthly otter-trawl collections were taken for two years along the northern coast of São Paulo State, Brazil. The reproductive period was studied based on the frequency of ovigerous females in the population along the year; the frequency of physiologically mature swimming crabs and the type of spawn. The condition of development of ovigerous females ovary was associated with the stage of eggs development. This species presents continuous reproduction in Ubatuba region and total spawn, but with successive broods, which suggests a multiple spawn during the reproduction period.

Key words:Portunus spinimanus, reproduction, spawn, Brazilian coast.

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ACKNOWLEDGMENTS. To Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), for the financial support (proc. nº 92/1941-5 and 94/4878-8), to Dr. Carlos Roberto Padovani for his help in statistical analysis and to the colleagues in the NEBECC.

Recebido em 18.VI.1998; aceito em 20.X.1999.

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Publication Dates

  • Publication in this collection
    19 June 2009
  • Date of issue
    1999

History

  • Accepted
    20 Oct 1999
  • Received
    18 June 1998
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