SciELO - Scientific Electronic Library Online

 
vol.65 número3Dieta e alimentação de peixes no rio Grande, a jusante da barragem de Volta Grande, MG/SPPequenos mamíferos do Parque Nacional da Chapada dos Veadeiros (Cerrado do Brasil Central): considerações ecológicas, cariológicas e taxonômicas índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Brazilian Journal of Biology

versão impressa ISSN 1519-6984versão On-line ISSN 1678-4375

Resumo

ANDRADE, P. M.  e  BRAGA, F. M. S.. Reproductive seasonality of fishes from a lotic stretch of the Grande River, high Paraná river basin, Brazil. Braz. J. Biol. [online]. 2005, vol.65, n.3, pp.387-394. ISSN 1519-6984.  http://dx.doi.org/10.1590/S1519-69842005000300003.

We searched for correlations between water level, rainfall, temperature, and reproductive activity of fishes in a lotic stretch of the Grande River below the Volta Grande Dam. Gillnets were used to catch the fish on six field journeys made bimonthly between April 1998 and February 1999. Fish gonads were classified according to maturation grade and the amount of mature or spent gonads was correlated with rainfall and air temperature. Most fish species showed seasonal reproduction (between October and February). The relative frequency of fully mature and spent gonads significantly correlated with rainfall (Spearman r = 0.94, p = 0.005) and air temperature (r = 0.84, p = 0.036), showing the importance of these factors in regulating the reproductive cycle of fishes in this location. Nevertheless, dam operation resulted in minimal water level variation that did not significantly correlate with reproductive activity (r = -0.43, p = 0.396).

Palavras-chave : fish; reproduction; seasonality.

        · resumo em Português     · texto em Inglês     · Inglês ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons