Resumo
In the present study it was examined the age and growth of Gymnogeophagus lacustris Reis & Malabarba, 1988 in Caconde lagoon (Tramandaí River Basin). The specimens (1080 males and 267 females) were collected monthly, between July 1992 and June 1993. The growth curve in total length was obtained by von Bettalanffy expression and the weight curve through the dedutive method supported by the mathematical expressions of the length growth curve and the length/weight relationship. Formation of the annulli in scales ocurred between winter and spring, and the first anual ring appears when the animals are aproximately 1.5 years old. L∞ and W∞ obtained for males and females, were 206.6mm and 157.3g and 120.2mm and 30.2g, respectively, demonstrating a characteristic sexual dimorfism for the species.
Gymnogeophagus; growth; coastal lagoon; Rio Grande do Sul; Brazil
Gymnogeophagus; growth; coastal lagoon; Rio Grande do Sul; Brazil
Idade e crescimento de Gymnogeophagus lacustris Reis & Malabarba, um Cichlidae endêmico da bacia hidrográfica do Rio Tramandaí, Rio Grande do Sul, Brasil
Age and growth of Gymnogeophagus lacustris Reis & Malabarba, an endemic cichlidae of Tramandaí river basin (Rio Grande do Sul, Brazil)
Sandra Maria HartzI; Willi Bruschi JuniorI; Márcio Vanini FormehlI,II
ICentro de Ecologia, Universidade Federal do Rio Grande do Sul. Caixa Postal 15.007, 91.501-970 Porto Alegre, Rio Grande do Sul. E-mail: hartzsm@ecologia.ufrgs.br
IIBolsista de Iniciação Científica do Programa PIBIC/CNPq/UFRGS
ABSTRACT
In the present study it was examined the age and growth of Gymnogeophagus lacustris Reis & Malabarba, 1988 in Caconde lagoon (Tramandaí River Basin). The specimens (1080 males and 267 females) were collected monthly, between July 1992 and June 1993. The growth curve in total length was obtained by von Bettalanffy expression and the weight curve through the dedutive method supported by the mathematical expressions of the length growth curve and the length/weight relationship. Formation of the annulli in scales ocurred between winter and spring, and the first anual ring appears when the animals are aproximately 1.5 years old. L∞ and W∞ obtained for males and females, were 206.6mm and 157.3g and 120.2mm and 30.2g, respectively, demonstrating a characteristic sexual dimorfism for the species.
Key words:Gymnogeophagus, growth, coastal lagoon, Rio Grande do Sul, Brazil.
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Recebido em 17.IV.1997; aceito em 24.VII.1998.
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Datas de Publicação
-
Publicação nesta coleção
10 Jul 2009 -
Data do Fascículo
1998
Histórico
-
Aceito
24 Jul 1998 -
Recebido
17 Abr 1997
