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

Abstract

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-

Growth and reproduction of the mangrove crab Goniopsis cruentata (Latreille, 1803) (Crustacea: Decapoda: Grapsidae) in southeastern Brazil

“…According to the longevity estimates and CW growth curves described here, individuals exhibiting 36 mm CW would be about 0.5 years old and would live for an additional 0.7 to 0.8 years. As individuals attained similar CW sizes in both studies, the lower longevity exhibited by G. cruentata in the present study also implies in a higher growth rate compared to the population studied by Silva and Oshiro (2002a). Other authors also reported differences in absolute growth patterns for brachyuran species from different locations, even from close latitudes, which was mainly attributed to differences between habitats such as in primary productivity or sheltering (e.g.…”

“…In this context, fast growing females would have a selective advantage because they attain sexual maturity at larger CW sizes with a greater cephalothoracic space for gonad development and egg production, therefore improving reproductive effort Taddei 2005a, Taddei andHerrera 2010). Silva and Oshiro (2002a) investigated the molt increment and intermolt period of G. cruentata in captivity collected in a mangrove area of Mangaratiba, state of Rio de Janeiro. These authors reported a continuous growth through successive molts and a similar mean number of molts (about 3) and molt increment (6.1%) for males and females over the 1.25 years of study period, suggesting that both genders exhibited similar growth rates, in contrast to the findings of the present study.…”

“…Beyond its economic value, G. cruentata may also play an important role in the functioning of mangrove ecosystems, by acting as an engineer species (Lima-Gomes et al 2011), probably affecting soil biogeochemistry, rates of decomposition, and nutrient cycling (see Werry andLee 2005, Kristensen 2008). Some studies evaluated biological aspects of G. cruentata in Brazil: Silva and Oshiro (2002a) investigated the species growth in captivity; Lira et al (2012) evaluated the weight versus carapace width relationship and the condition factor; Fransozo (1998, 2005) and Moura and Coelho (2004) studied its physiological sexual maturity; Fransozo (2000, 2003), Silva and Oshiro (2002b), and Moura and Coelho (2003) investigated reproductive aspects such as fecundity and breeding period; Garcia and Silva (2006) described the species testis and vas deferens morphology, and spermatophore formation; Garcia and Silva (2009) described the sperm cell development; Souza and Silva (2009) described the morphology of the female reproductive system and the development of the germ cells; Fransozo et al (1998) described the species first zoeal stage; Moura et al (2000), Santos and Botelho (2002), and Botelho et al (2004) provided information on population structure; Lima-Gomes et al (2011) investigated its feeding behaviour; and Maciel and Alves (2009) analyzed the knowledge and practices of traditional gatherers on the species.…”

Crescimento somático do caranguejo-uçá Ucides cordatus (Crustacea, Brachyura, Ocypodidae) em laboratório

“…Dentre as espécies estudadas até então, o sexo parece não influenciar o percentual de incremento de muda, como em C. maenas (CROTHERS, 1967), Rhithropanopeus harrisii (Gould, 1841) (TUROBOYSKI, 1973), C. punctatus (BROEKHUYSEN, 1941) e G. cruentata (SILVA & OSHIRO, 2002). No entanto, o menor tamanho percentual em relação ao incremento de muda verificado para as fêmeas pode ser atribuído a uma reduzida longevidade desses indivíduos (HENNING, 1975), ou ainda devido ao menor crescimento somático atingido depois que o animal alcança a maturidade sexual (HARTNOLL, 1982).…”

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“…Essa espécie é encontrada errante no solo, na região intertidal, entre as raízes, troncos e ramos das árvores do mangue, ou sob pedras, tanto em substratos consolidados como inconsolidados. Além disso, apresenta importante papel ecológico como herbívoro primário e predador (COELHO, 1965;COELHO;RAMOS-PORTO, 1994/95;MELO, 1996 FRANSOZO, 1998FRANSOZO, , 2003FRANSOZO, , 2005SILVA;OSHIRO, 2002aOSHIRO, , 2002b, e outros nos litorais de Pernambuco (MOURA et al, 2000;SANTOS et al, 2001;SANTOS;BOTELHO, 2002;COELHO, 2003 …”