Gonadal Maturation and Artificial Spawning of the Grooved Carpet Shell Clam, Ruditapes decussatus from Timsah Lake, Suez Canal, Egypt.

EGYPT; ISMAILIA (Egypt : Province)

The gonadal maturation and artificial spawning were investigated for the grooved carpet shell clam (Ruditapes decussatus) under experimental conditioning. In the current study, gonad stages, gonad index as well as induced spawning were carried out in a private fish farm in Abu-Sultan, Ismailia. Samples were exposed to different spawning induction methods, namely; thermal shock, chemical, microalgae and stripping methods. In both sexes of the clam, gonad stages (active, ripe, partially spawning and completely spawning) appeared throughout the conditioning periods. Findings showed that the highest values of male and female gonad index were 28.4 and 29.4, respectively in November 2015, while in December and September of the same year the lowest marked values were 18.4 and 19.3 for males and females, respectively. Notedly, among the four previously mentioned methods, the thermal shock and stripping methods proved their successful impact to induce spawning in the clam. [ABSTRACT FROM AUTHOR]

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