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      Population structure of two Astyanax Baird & Girard, 1854 (Teleostei, Characidae) species from upper Paraguaçu river

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          The fishes of the family Characidae are among the main species of fresh water fishes in South America. In this work, some aspects of the population structure of two Astyanax species were assessed. The fishes were caught in Santo Antônio and São José rivers, in the Paraguaçu basin, by standardized monthly samplings adapted to the microhabitats. Astyanax sp. b (São José river) presented larger size than Astyanax sp. a (Santo Antônio river). The length-weight relationship showed positive allometric growth for Astyanax sp. a, and negative for Astyanax sp. b. Both the species showed a long reproductive period, with higher activities in dry period.

          Translated abstract

          Os peixes da família Characidae estão entre os principais representantes de peixes de água doce da região Neotropical. Este trabalho apresenta alguns aspectos da estrutura populacional de duas espécies de Astyanax coletadas a partir de amostragens mensais padronizadas e adaptadas a diferentes microhabitats, em trechos dos rios Santo Antônio e São José, tributários do alto curso do rio Paraguaçu. Astyanax sp. b, coletada no rio São José apresentou maior tamanho que Astyanax sp. a, coletada no rio Santo Antônio. A relação peso-comprimento indicou um crescimento alométrico positivo para Astyanax sp. a e negativo para Astyanax sp. b. Ambas as espécies apresentaram um longo período reprodutivo, com maior atividade reprodutiva no período seco.

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          Most cited references 17

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          The Length-Weight Relationship and Seasonal Cycle in Gonad Weight and Condition in the Perch (Perca fluviatilis)

           E. D. Le Cren (1951)
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            A new subfamily of Trichomycteridae (Teleostei, Siluriformes), lower loricarioid relationships and a discussion on the impact of additional taxa for phylogenetic analysis

             Mário Pinna (1992)
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              Biología da reprodução de peixes teleósteos: teoria e practica


                Author and article information

                Brazilian Archives of Biology and Technology
                Braz. arch. biol. technol.
                Instituto de Tecnologia do Paraná - Tecpar (Curitiba, PR, Brazil )
                February 2008
                : 51
                : 1
                : 105-112
                Botucatu SP orgnameUniversidade Estadual Paulista orgdiv1Departamento de Morfologia orgdiv2Laboratório de Ecologia de Peixes; Instituto de Biociências Brasil novaes@ 123456ibb.unesp.br
                Feira de Santana BA orgnameUniversidade Estadual de Feira de Santana orgdiv1Departamento de Ciências Biológicas orgdiv2Laboratório de Ictiologia Brasil
                S1516-89132008000100013 S1516-8913(08)05100113

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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