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Oogenesis dynamic and spawning of the dab, Limanda limanda, from the western coast of Brittany and the English Channel Cinetique de lovogenese et strategie de ponte chez la limande, Limanda limanda, en mer dIroise et en Manche orientale



Oogenesis dynamic and spawning of the dab, Limanda limanda, from the western coast of Brittany and the English Channel Cinetique de lovogenese et strategie de ponte chez la limande, Limanda limanda, en mer dIroise et en Manche orientale



Aquatic Living Resources 93: 249-256



In order to describe oogenesis and the mechanism of spawning in the dab, Limanda limanda (L., 1758) the ovaries of 74 females caught on the western coast of Brittany (the Bay of Douarnenez) and in the English Channel (the Bay of Seine) were investigated. A microscopic scale including six oocyte developmental stages was used to classify oocytes. Cortical alveoli which appeared in the peripherical cytoplasm were the first microscopic features of vitellogenesis; they were present in 120 mu-m diameter oocytes, the threshold size to be retained for fecundity studies. In ovaries of precocious females there was a gap between previtellogenic and vitellogenic oocytes before beginning of spawning, thus the dab must be considered as a species with a determinate fecundity. The intensity of atresia was low and the annual fecundity was nearly the same as the potential annual fecundity. On the other hand in ovaries of females with later spawning, vitellogenic oocytes which were unspawned at the end of spring degenerate.

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