Resumo
The objective of this work was to get some knowledge about the Guaia stone crab reproduction. The sampling was monthly obtained in the intertidal zone at the Ibicuí Rock Beach. The 638 crabs were collected from August, 1995 to March, 1997. In this total amount 293 were males and 345 (41 ovigerous crabs) were female crabs. Biometrical data informing the total width and length were taken, and gonadal stage was checked macroscopically. The total male width range was between 7.9 to 67.1 mm, while in the female crabs it was between 4.4 to 79.3 mm. The female ones were bigger than the male ones. The ovigerous female crabs were found mainly on Spring and Summer and it probably indicates the reproduction season. The carapace width range of the ovigerous female crabs was about 38.0 and 77.0 mm. The individual fecundity was determined on the number of eggs laid, which were dissociated by means of sodium hipoclorito. The number of eggs laid was about 12,800 and 212,000, according to the female size and the average number of the eggs was 98,800. They were round in shape and their size varied between 0.31 and 0.44 mm. Their average size was 0.37 mm. The five female gonadal stages were determined by the color and the width of the gonads. The estimated mean size of first sexual maturity was 37.8 mm carapace width for female.
Decapoda; Xanthidae; Menippe nodifrons; reproduction; stone crab; Sepetiba Bay
Decapoda; Xanthidae; Menippe nodifrons; reproduction; stone crab; Sepetiba Bay
Aspectos reprodutivos do caranguejo guaia, Menippe nodifrons Stimpson (Crustacea, Decapoda, Xanthidae) da Baía de Sepetiba, Rio de Janeiro, Brasil
Reproductive aspects of the guaia stone crab, Menippe nodifrons Stimpson (Crustacea Decapoda, Xanthidae) at the Sepetiba Bay, Rio de Janeiro, Brazil
Lidia Miyako Yoshii Oshiro
Estação de Biologia Marinha, Posto de Aquicultura, Universidade Federal Rural do Rio de Janeiro. Antiga Rodovia Rio-São Paulo, Km 47, 23851-970 Seropédica, Rio de Janeiro, Brasil
ABSTRACT
The objective of this work was to get some knowledge about the Guaia stone crab reproduction. The sampling was monthly obtained in the intertidal zone at the Ibicuí Rock Beach. The 638 crabs were collected from August, 1995 to March, 1997. In this total amount 293 were males and 345 (41 ovigerous crabs) were female crabs. Biometrical data informing the total width and length were taken, and gonadal stage was checked macroscopically. The total male width range was between 7.9 to 67.1 mm, while in the female crabs it was between 4.4 to 79.3 mm. The female ones were bigger than the male ones. The ovigerous female crabs were found mainly on Spring and Summer and it probably indicates the reproduction season. The carapace width range of the ovigerous female crabs was about 38.0 and 77.0 mm. The individual fecundity was determined on the number of eggs laid, which were dissociated by means of sodium hipoclorito. The number of eggs laid was about 12,800 and 212,000, according to the female size and the average number of the eggs was 98,800. They were round in shape and their size varied between 0.31 and 0.44 mm. Their average size was 0.37 mm. The five female gonadal stages were determined by the color and the width of the gonads. The estimated mean size of first sexual maturity was 37.8 mm carapace width for female.
Key words: Decapoda, Xanthidae. Menippe nodifrons, reproduction, stone crab. Sepetiba Bay
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AGRADECIMENTOS. Agradecemos a colaboração do Sr. Casimiro Antônio Alves, Luciano Marques Galdino e estagiários da Estação de Biologia Marinha, Universidade Federal Rural do Rio de Janeiro, que auxiliaram durante o período de coleta dos animais em campo.
Recebido em 28.V.1998; aceito em 24.VIII.1999.
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Datas de Publicação
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Publicação nesta coleção
15 Jun 2009 -
Data do Fascículo
1999
Histórico
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Recebido
28 Maio 1998 -
Aceito
24 Ago 1999