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Aspectos reprodutivos do caranguejo Aratus pisonii (H. Milne Edwards) (Crustácea, Decapoda, Grapsidae) do manguezal de Itacuruçá, Rio de Janeiro, Brasil

Reproductive aspects of crab Aratus pisonii (H. Milne Edwards) (Crustacea, Decapoda, Grapsidae) in Itacurucá's mangrove

Resumo

The objective of this work has to get knowledge about the reproductive aspect of the tree crab Aratus pisonii (H. Milne Edwards, 1837). The sampling were made monthly from April, 2000 to April, 2001, in the Itacurucá's mangrove (22º54'S and 43º33'W), Rio de Janeiro. The crabs were collected handly, using an effort of 50 minutes with three collectors. In laboratory, the specimens were separated by sex and had measured the carapace width and lenght. The ovigerous females were separated and the mass of eggs was removed for a mensurament of size and count of eggs. Afterwards, the animals were conservad in 70% alcohol. A total of 783 individuals were caught among 59% males and 41% females among these 8% were ovigerous. The ovigerous females were found almost during the whole year, except in the winter showing major plenty on February and March, demonstrating the reproductive period. The ovigerous females presented size between 14.0 and 23.6 mm of carapace width and the average fecundity estimated to the specie was 9081 ± 3684 eggs. The mean size of the eggs was 0.27 mm varied from 0.24 to 0.29 mm and the size at onset of egg production was verified from 13.1 to 15.0 mm of the carapace width.

Aratus pisonii; reproduction; tree crab; Itacurucá's mangrove; Sepetiba Bay


Aratus pisonii; reproduction; tree crab; Itacurucá's mangrove; Sepetiba Bay

Aspectos reprodutivos do caranguejo Aratus pisonii (H. Milne Edwards) (Crustácea, Decapoda, Grapsidae) do manguezal de Itacuruçá, Rio de Janeiro, Brasil

Reproductive aspects of crab Aratus pisonii (H. Milne Edwards) (Crustacea, Decapoda, Grapsidae) in Itacurucá's mangrove

Cristiane Ferreira NicolauI,II; Lídia Miyako Yoshii OshiroII

ICurso de Pós-Graduação em Biologia Animal, Universidade Federal Rural do Rio de Janeiro

IIEstação de Biologia Marinha, Universidade Federal Rural do Rio de Janeiro. Rua Sereder, Itacuruçá, 23880-000 Rio de Janeiro, Rio de Janeiro, Brasil

ABSTRACT

The objective of this work has to get knowledge about the reproductive aspect of the tree crab Aratus pisonii (H. Milne Edwards, 1837). The sampling were made monthly from April, 2000 to April, 2001, in the Itacurucá's mangrove (22º54'S and 43º33'W), Rio de Janeiro. The crabs were collected handly, using an effort of 50 minutes with three collectors. In laboratory, the specimens were separated by sex and had measured the carapace width and lenght. The ovigerous females were separated and the mass of eggs was removed for a mensurament of size and count of eggs. Afterwards, the animals were conservad in 70% alcohol. A total of 783 individuals were caught among 59% males and 41% females among these 8% were ovigerous. The ovigerous females were found almost during the whole year, except in the winter showing major plenty on February and March, demonstrating the reproductive period. The ovigerous females presented size between 14.0 and 23.6 mm of carapace width and the average fecundity estimated to the specie was 9081 ± 3684 eggs. The mean size of the eggs was 0.27 mm varied from 0.24 to 0.29 mm and the size at onset of egg production was verified from 13.1 to 15.0 mm of the carapace width.

Key words:Aratus pisonii, reproduction, tree crab, Itacurucá's mangrove, Sepetiba Bay

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AGRADECIMENTOS. Agradecemos a colaboração do Sr. Casemiro Antonio Alves da Estação de Biologia Marinha da UFRRJ, no auxílio às coletas mensais e das Ms. Zilanda de Souza Silva e Giovana Valverde Lima nas coletas, utilização dos programas para análise e apresentação dos dados.

Recebido em 08.VIII.2002; aceito em 27.XI.2002.

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Datas de Publicação

  • Publicação nesta coleção
    03 Jun 2009
  • Data do Fascículo
    Dez 2002

Histórico

  • Aceito
    27 Nov 2002
  • Recebido
    08 Ago 2002
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