Año 1994, Número 9 – 25-58

Año 1994, Número 9 – 25-58

Cotrina, C.P.; Christiansen, H.E. 1994.  El comportamiento reproductivo del besugo (Pagrus pagrus) en el ecosistema costero bonaerense.
Rev. Invest. Desarr. Pesq., 9: 25-58.
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The species, like other members of the Family Sparidae, has a hermaphroditic phase in its sexual development, affecting the population partially during the first period of life. The sexual differentiation mechanisms have been inferred by the way of macroscopic characterization and proportionality of the different stages observed during the first five year classes. The highest proportion of specimens with bisexual gonads is observed during the third year of life: from the macroscopical point of view, both sexes are equally developed or with predominance of the masculine crest; microscopically, both are functional and synchronous. The masculine portion demostrate a normal expulsion of germ cells and in the ovaric part post-ovulatory and atretic follicles with specific characteristics are observed. Even when some specimens can be recognized as males and females from early ontogeny, the majority of juveniles is proteroginous hermaphroditic, but the proportion of this hermaphroditic period affects both sexes in a different way. The common sea bream spawn once a year, between November and January. The ovarian cycle has been determined, macro and microscopically.