P. Monsalvo-Spencer, A.N. Maeda-Martinez, T. Reynoso-Granados-1997
Journal of Shellfish Research, 16(1):67-70
Abstract:
Reproductive maturity and spawning induction were studied in the hermaphroditic catarina scallop Argopecten ventricosus. A closed system with seawater recirculation (3L/min), constant temperature (23+/- 1 C), and salinity (37 ppt) was used. The scallops were fed 3.9 X 10^9 cells/animal per day of a 6:3:1 mixture of the microalgae Isochrysis galbana, Chaetoceros sp., and Tetraselmis suecica. Ninety-five percent of scallops reached reproductive maturity in 27 days. For spawning induction, several methods were used. Thermostimulation combined with the addition of sexual products produced spawning in 50% of the animals and was the only method from which both gametes were obtained. Male spawning was initiated in a higher proportion than female spawning. Serotonin (5-hydroxytryptamine) was very effective, inducing sperm spawning only. The rest of the methods (electric shocks and KC1 injections) failed as spawning inducers.
(Division de Biologia Marina, Centro de Investigaciones Biologicas del Noroeste, S.C., P.O. Box 128, La Paz, B.C.S., Mexico, 23000)
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