Sexual maturity and hermaphroditism of the red porgy Pagrus pagrus (Teleostei: Sparidae) |
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| Authors: | L Kokokiris S Bruslé M Kentouri A Fostier |
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| Institution: | (1) Laboratory of Aquaculture, University of Crete, P.O. Box 2208, 71409 Heraklion, Crete, Greece, GR;(2) Laboratoire de Biologie Marine, Université de Perpignan, 52, Av. de Villefrance, F-66860, Perpignan cedex, France, FR;(3) Laboratoire de Physiologie des Poissons, Institut National de la Recherche Agronomique, INRA, Campus de Beaulieu, F-35042, Rennes cedex, France, FR |
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| Abstract: | Gonadal changes related to sexual maturity were examined by histology in reared populations of the red porgy Pagrus pagrus L., aged 0.5 to 6.5 years. More than 50% of red porgies were mature at the age of 4 years although some individuals were
already mature at the age of 3, as indicated by changes in the gonadosomatic index, plasma levels of vitellogenin, 17β-estradiol
and testosterone in females and males. Sex frequency distribution analysis in relation to the age and histological analysis
of the gonads indicated the presence of males originated from the sex change of adult functional females. P. pagrus is a protogynous species. Some females had not changed sex up to the age of 6.5 years.
Received: 16 July 1998 / Accepted: 29 April 1999 |
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