Aspects of reproduction of striped venus Chamela gallina in the Gulf of Cadiz (SW Spain): implications for fishery management
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size at first maturity
Gulf of Cadiz
This study analyzes the main reproductive aspects of a natural population of Chamelea gallina on the SW Spanish coast (Gulf of Cadiz): gametogenic cycle, size at first maturity, size at sexual differentiation and partial fecundity. Methodology involved the use of standard histological techniques, image analysis and the assessment of the variation of gonadal growth. Monitoring throughout one year (May 2010–April 2011) identified 5 gametogenic developmental stages and evidenced the existence of a long reproductive period between March and September. In May 70% of individual were in stage 4, reproduction period (sub-stages 4A: maturity and 4B: partial emission), whereas in June most individuals were partially emitting gametes (4B). An important peak of gamete emission took place between June and July, after that recovery stages were detected (substage 4C). In September most of individuals were in stage 5 (spent). It was not possible to define a single spawning event, but signs of ...
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