Idade e crescimento de Callinectes danae e C. ornatus (Crustacea, Decapoda) na Baía de Guanabara, Rio de Janeiro, Brasil

Abstract

ABSTRACT. Age and growth of Callinectes danae and C. ornatus (Crustacea, Decapoda) in Guanabara Bay, Rio de Janeiro, Brazil. Callinectes danae Smith, 1869 and C. ornatus Ordway, 1863 constitute an important portion from the fishing products at Guanabara Bay. Both species compose a significant by-catch fraction being a lot discarded during shrimp trawlings along Brazilian coast. Growth curves were estimated by modal progression analysis. For the biological parameters it was applied the Bertalanffy growth function and for the age it was used its inverse formula. Growth curves of C. danae and C. ornatus were respectively: LC = 120 (1 -e -0,005t ), LC = 113 (1 -e -0,005t ); LC = 94 (1 -e -0,005t ) and LC = 110 (1 -e -0,005t ). The age for both species reached around 2.5 years, besides to confirm growth curves. Growth study in crustaceans is very important, because besides supplying biological information it subsidizes fishery management for exploted species.

Age and growth of Callinectes danae (Brachyura: Portunidae) in a tropical region

“…This result was also observed for C. danae in Venezuela (11°N) (Castillo et al, 2011) and at lower latitudes, between 22°and 27°S, in Brazil (Keunecke et al, 2008 andBranco andMasunari, 1992, respectively). An important feature of the growth curves is that the CW ∞ and k act in opposing ways, i.e., a model can be fitted to the same data with lower values of CW ∞ if values of k are higher and vice versa.…”

Abundance and spatial-temporal distribution of the family Portunidae (Crustacea, Decapoda) in the Curuçá estuary on the northern coast of Brazil

“…In Brazil, only the state of Santa Catarina (southern region) has a fishery targeting swimming crabs, whereas they are generally a bycatch in fish and shrimp fisheries in the most of the other regions of the country (Vieira et al, 1996;Andrade, 1998;Keunecke et al, 2008). On the coast of the state of Pará, swimming crabs serve as a food resource for the local human population, thereby constituting an important source of protein as well as a source of income in the for local commerce.…”

Baía de todos os santos: aspectos oceanográficos

“…Em Santa Catarina, na Lagoa da Conceição, esses camarões podem viver até 3,5 anos, com os machos apresentando maior taxa de crescimento (k=0,70) e maior comprimento máximo teórico, no modelo Von Bertalanffy (L∞=140 mm de largura da carapaça), do que as fêmeas (k=0,66; L∞=133 mm) (Branco e Masunari, 1992). Já na Baía de Guanabara (RJ), tanto a taxa de crescimento (k=2,0) quanto a idade máxima foram menores do que em Santa Catarina (2,5 anos), assim como o comprimento teórico máximo (L∞ machos=120 mm de largura da carapaça e L∞ fêmeas=113 mm) (Keunecke et al, 2008). A reprodução é contínua, ao longo do ano, podendo as fêmeas apresentar mais de uma desova por período reprodutivo (Costa e Negreiros-Fransozo, 1998).…”

“…Tolera grande variação de salinidade (0 a 50) e temperatura (18 a 31°C) (Tavares, 2002b). Machos e fêmeas da população da Baía de Guanabara (RJ) apresentaram longevidade de 2,5 anos e taxa similar de crescimento (k ≈ 2), mas com comprimentos assintóticos diferentes (L∞ machos=94 mm de largura da carapaça; L∞ fêmeas=110 mm) (Keunecke et al, 2008). O espectro alimentar das populações de Santa Catarina é amplo, constituído por algas, macrófitas, Foraminiferida, Mollusca, Polychaeta, Crustacea, Echinodermata e Osteichthyes, com predomínio de moluscos bivalves, camarões, caranguejos e peixes (Branco et al, 2002); enquanto no Sudeste (Ubatuba, SP) destacam-se os camarões, peixes e poliquetas (Petti, 1997).…”