Aspectos reprodutivos das espécies Acestrorhynchus microlepis, Pygocentrus nattereri e Plagioscion squamosissimus capturadas no Lago do Juá e Lago Grande de Monte Alegre, no Oeste do Pará

Abstract

This work aimed to evaluate the reproductive aspects of the three most abundant carnivorous species throughout all campaigns, which were Acestrorhynchus microlepis, Pygocentrus nattereri and Plagioscion squamosissimus, captured in the lakes of Juá and Lago Grande in Monte Alegre, Pará. At the end of the monitoring, 448 A. microleps, 62 P. quamosissimus and 96 P. nattereri were captured. Collections were made monthly in Lake Juá and Lake Monte Alegre, in 4 seasonal periods (flood, flood, ebb and dry). To determine the breeding season, the gonadosomatic relationship (GSR) was calculated bimonthly, considering the females in maturation stages "B", "C" and "D", according to Vazzoler's equations. The environment was classified according to its use at different times of the year in: use for reproduction (gonads C and D) and nursery (A), rest and/or development (B). In this study, a pattern of reproductive seasonality of the species is evidenced, confirmed by the gonadosomatic indices (GSI) throughout the months of January to May, where these species showed greater reproductive activity, that is, greater numbers of mature gonads in these months.