Reproduction of Oligosarcus hepsetus (Cuvier, 1829) (Characiforms) in the Serra do Mar State Park, São Paulo, Brazil

Lm Gomiero,L Garuana,Fms Braga

doi:10.1590/s1519-69842008000100027

Lm Gomiero, L Garuana + Show 1 more

Open Access

https://doi.org/10.1590/s1519-69842008000100027

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Abstract

The purpose of this study was to characterize the reproduction of Oligosarcus hepsetus in the Grande river (Santa Virginia Unit - Serra do Mar State Park) based on the reproductive period, length of first gonadal maturation for both sexes, sexual proportion, oocyte development, type of spawn and fecundity. The Grande river was sampled monthly from January through December 2004. The numerical frequency of the stages of maturity and the volumetric method were utilized to determine the reproductive period and fecundity, respectively. The reproduction of Oligosarcus hepsetus was characterized by a long period, relatively low fecundity, precocious length of first gonadal maturation and parceled spawning.

Highlights

One of the most important links in the life cycle of fish and in their populational dynamics is reproduction (Braga, 2001)
The general reproduction pattern exhibited by a species or population characterizes the strategies, while reproductive tactics are the variable characteristics within that pattern, which are evoked in response to environmental fluctuations
One hundred and eighteen specimens of Oligosarcus hepsetus were collected in the classes with total lengths of

Summary

Introduction

One of the most important links in the life cycle of fish and in their populational dynamics is reproduction (Braga, 2001). The general reproduction pattern exhibited by a species or population characterizes the strategies, while reproductive tactics are the variable characteristics within that pattern, which are evoked in response to environmental fluctuations. The length of the first gonadal maturation, the sex ratio, periods and type of spawning, oocyte development and fecundity are examples of the variable characteristics of reproductive strategy to each species (Vazzoler, 1996). Biol., 68(1): 187-192, 2008 gies is an indispensable element in guiding the management, handling and preservation of ichthyofauna in face of the impacts caused by anthropic actions such as fishing, pollution, the elimination of spawning and breeding areas through damming of water courses and destruction of marginal vegetation (Vazzoler and Menezes, 1992)

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