Gonadossomatic relation and reproductive strategy of Brycon opalinus (Cuvier, 1819) in the Serra do Mar State Park - Núcleo Santa Virgínia, Atlantic Forest, Brazil

Brazilian Journal of Biology

Lm Gomiero¹  Fms Braga¹ 

[1] ,Universidade Estadual Paulista Instituto de Biociências Departamento de ZoologiaRio Claro São Paulo ,Brazil

关键词: Brycon opalinus;    gonadossomatic relation;    reproductive strategy;    Brazil;    Brycon opalinus;    relação gonadossomática;    estratégia reprodutiva;    Brasil;   

DOI  :  10.1590/S1519-69842007000400020

来源: SciELO

【 摘 要 】

The objective of this study was to analyze the gonadossomatic relation of males and females of Brycon opalinus (the Pirapitinga do Sul) in the Serra do Mar State Park-Núcleo Santa Virgínia. The study area included three rivers: Paraibuna, Ipiranga, and Grande. From the gonadossomatic relation, it was possible to determine the reproductive season and strategy of this species. The gonadossomatic relation was high throughout the year for both males and females. Sperm competition and dilution of the ejaculate in the spawning locations favored substantial development of the testicles. The sex ratio of Brycon opalinus was always in favor of females. The existence of sexual dimorphism in this species was confirmed from the larger size of the females.

【 授权许可】

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