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

Brazilian Archives of Biology and Technology

Alexandre Clistenes De Alcântara Santos²  José Luís Costa Novaes¹ 

[1] ,Universidade Estadual de Feira de Santana Departamento de Ciências Biológicas Laboratório de IctiologiaFeira de Santana BA ,Brasil

关键词: Astyanax;    Characidae;    Chapada Diamantina;    Paraguaçu River;    population structure;   

DOI  :  10.1590/S1516-89132008000100013

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY-NC   
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