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Crescimento em Goniopsis cruentata (Latreille) (Crustacea, Brachyura, Grapsidae) em laboratório

Growth in Goniopsis cruentata (Latreille) (Crustacea, Brachyura, Grapsidae) in laboratory

Resumo

The growth of the crab Goniospis cruentata (Latreille. 1803), was studied in the laboratory, through of the molt increment and intermolt period. A total of 86 crabs (48 males and 38 females) were collected in the ltacuruçá's Mangrove in Mangaratiba's county. Rio de Janeiro. The crabs were maintened in the laboratory in four 1000 l tanks, with continuous water circulation during fifteen months. They were fed each two days with pieces of fish and fruits. The crabs varied in size from 19.3 to 56.0 mm in males and 23.3 to 48.8 mm in females. The males presented until four molts during the experiment and the females until six molts. The molts oceurred during ali the months. The mean percentage of molt increment was 6.1 ± 2.7%, for both sexes and it decreased with the animal growth. The relation between the molt increment and the carapace width can be expressed by the equation IM = -0.32LC + 18.26 (r = -0.82). This relation didn't show any significative difference between the sexes. The mean intermolt period was of 87.6 + 37.3 days in male crabs and 97.3 ± 27.6 days in females. The growth was contiguous, through successive molts, although the increment was reduced with animal size. The intermolt period was proportional to the animal size increase, however males with autotomy of limbs had the intermolt period reduced.

Brachyura; Goniopsis cruentata; growth; molt increment; intermolt period; laboratory


Brachyura; Goniopsis cruentata; growth; molt increment; intermolt period; laboratory

Crescimento em Goniopsis cruentata (Latreille) (Crustacea, Brachyura, Grapsidae) em laboratório

Growth in Goniopsis cruentata (Latreille) (Crustacea, Brachyura, Grapsidae) in laboratory

Zilanda de Souza Silva; Lídia Miyako Yoshii Oshiro

Estação de Biologia Marinha, Universidade Federal Rural do Rio de Janeiro. Rua Sereder, 23860-000 Itacuruçá, Mangaratiba, Rio de Janeiro, Brasil. E-mail: oshiro@ufrrj.br

ABSTRACT

The growth of the crab Goniospis cruentata (Latreille. 1803), was studied in the laboratory, through of the molt increment and intermolt period. A total of 86 crabs (48 males and 38 females) were collected in the ltacuruçá's Mangrove in Mangaratiba's county. Rio de Janeiro. The crabs were maintened in the laboratory in four 1000 l tanks, with continuous water circulation during fifteen months. They were fed each two days with pieces of fish and fruits. The crabs varied in size from 19.3 to 56.0 mm in males and 23.3 to 48.8 mm in females. The males presented until four molts during the experiment and the females until six molts. The molts oceurred during ali the months. The mean percentage of molt increment was 6.1 ± 2.7%, for both sexes and it decreased with the animal growth. The relation between the molt increment and the carapace width can be expressed by the equation IM = -0.32LC + 18.26 (r = -0.82). This relation didn't show any significative difference between the sexes. The mean intermolt period was of 87.6 + 37.3 days in male crabs and 97.3 ± 27.6 days in females. The growth was contiguous, through successive molts, although the increment was reduced with animal size. The intermolt period was proportional to the animal size increase, however males with autotomy of limbs had the intermolt period reduced.

Key words: Brachyura, Goniopsis cruentata, growth, molt increment, intermolt period, laboratory

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AGRADECIMENTO. Ao Senhor Casemiro Antônio Alves, pelo auxílio nas coletas.

Recebido em 10.XII.2001; aceito em 04.IX.2002.

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Datas de Publicação

  • Publicação nesta coleção
    15 Maio 2009
  • Data do Fascículo
    Set 2002

Histórico

  • Aceito
    04 Set 2002
  • Recebido
    10 Dez 2001
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