Evidence of gonochorism in a grouper, <Emphasis Type="Italic">Mycteroperca rosacea</Emphasis>, from the Gulf of California,Mexico |
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| Authors: | Brad E Erisman Jorge A Rosales-Casián Philip A Hastings |
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| Institution: | (1) Marine Biology Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093-0208, USA;(2) Departamento de Ecologia, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, México |
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| Abstract: | The sexual pattern and sexual development of the leopard grouper, Mycteroperca rosacea, were investigated from 483 specimens collected from the Gulf of California, Mexico. Histological and population data indicated
a gonochoric sexual pattern. Some juveniles passed through an immature bisexual phase of gonadal development, but no evidence
of post-maturational sex change was found. The immature bisexual phase is believed to be associated only with male development.
The size distribution and size at sexual maturity were similar for both males and females. In accordance with predictions
of the size-advantage model, the gonochoric sexual pattern of M. rosacea is likely influenced by its group-spawning mating system.
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| Keywords: | Mycteroperca rosacea Groupers Sexual pattern Gonochorism |
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