ABSTRACT. Reproductive aspects of GOl/iopsis cruelltata (Latreille) (Crustacea, Brachyura, Grapsidae) at the Sepetiba Bay, Rio de Janeiro, Brazil. The objective of this study was to get so me knowledge abou! the reproducli ve aspects of Goniopsis cruel/tala (Latreille, 1803), concerning through sex ralio, morphological sex ual maturily, reproducti ve periad, Fecundity and eggs size. The crabs were collected monthly in Ilacuruçá's Mangroves from November, 1997 to November, 1998. Four hundred and seven crabs were caughl and they were 47 % males, 36% females and 17% ovigero us females. The sex ratio was I: 1.1 3 (male:female) (X 2 = 1.54, P > 0.05). The Goniopsis cruel/fata é um cara ng uejo sem i terrestre conhecido popularmente como aratu ou mu la ta (MELO 1996) (1998, 1999), que estudaram uma população em Ubatuba, São Pau lo, sobre os aspectos de re produção e c rescime nto . Na B aía de Sepetiba, os aspectos reprod ut ivos e m braquiúros foram estud a d os apenas para as
ABSTRACT. Growth in GOlliopsis cruelllala (Latreille) (Crus tacea, Brachyura, Grapsidae) in laboratory. The growth of the crab GO/liospis cruel/ta ta (Latreill e, 1803), was studied in the laboratory, through of the molt incre ment and intermolr period. A total of 86 crabs (48 ma les and 38 femal es) were collected in the Itacuruçá 's Mangrove in Mangaratiba 's cOllnly, Ri o de Jane iro . The crabs were maintened in the laboratory in fOllr 1000 I tanks, with continuous water circulation during fifteen months. They were fed each two days with pieces of fish and fruit s. The crabs varied in size from 19.3 to 56.0 mm in males and 23.3 to 48.8 mm in fema les. The males presented until four molts during the experiment and lhe fema les ul1lil ix mo lts. The molts occ urred during ali the months . The mean percentage of molt increment was 6. 1 ± 2.7%, for both sexes and it decreased wi th lhe animal growlh . The relation between the moll incre menl and the carapace width can be expressed by lhe equation IM = -0.32LC + 18.26 (r = -0.82). Thi s relation didn ' t show any signifi cati ve difference between the sexes. The mean intermolt peri od was of 87 .6 ± 37 .3 days in malc crabs and 97.3 ± 27.6 days in females . The growth was co ntiguous, through successi ve molts, although the increment was reduced with animal size. The inlennoll period was proportional 10 the animal size increa e, howeve r males wit h alltotomy of limbs had the intermolt period reduced. KEY WORDS . Brachyura, GO/liopsis cruenrata , growth. molt increment, interInolt period , laboratory Os crustáceos apresentam um padrão de cresc imento diferente dos demais animais, por apresentarem vári os estágios de desenvolvimento da fase larval até a fase adulta e o crescimento através de mudas suces ivas . A muda em crustáceos pode ser descrita como o processo de eliminação da carapaça velha ou exoesq ueleto, com secreção de um novo, faze ndo parte do mecanismo de crescimento (LOB ÃO et ai. 1996). Durante a pré-muda um novo tegumento é formado, na muda o tegumento velho é liberado, o cru stáceo aumenta em tama nho pela absorção de água e na pós-muda o novo tegumento endurece pelo processo de calcificação (HARTNOLL 1988). A rigidez do tegumento facilita a mensuração permitindo então o estudo do cresc imento dos crustáceos a cada muda. A porcentagem de aumento no tamanho do animal entre a pré-muda e a pós-muda é o incremen to de muda e o tempo gasto entre duas mudas sucess ivas é o período de intermuda. Esses doi s parâmetros determinam a taxa de cresc imento nos crustáceos (H ART OLL 1988).Estudos sobre o incremento de muda em braquiúros fora m realizados por H ARTNOLL ( 1982, 1988) e, especi ficamente nos grapsídeos, destacam-se o traba-
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