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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
LM Gomiero [1] ; FMS Braga [2]
Total Authors: 2
Affiliation:
[1] Universidade Estadual Paulista. Instituto de Biociências. Departamento de Zoologia - Brasil
[2] Universidade Estadual Paulista. Instituto de Biociências. Departamento de Zoologia - Brasil
Total Affiliations: 2
Document type: Journal article
Source: Brazilian Journal of Biology; v. 67, n. 4, p. 721-726, 2007-11-00.
Abstract

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. (AU)