Thermal Shock Spawning of Philippine Cupped Oyster Crassostrea iredalie, Faustino 1932
Keywords:
Thermal Shock, Spawning, Philippine Cupped Oyster, Crassostrea iredalieAbstract
Induced spawning of Philippines cupped oyster Crassostrea iredalie, throughthermal shock was investigated. Five (5)temperatures was tested namely; 40oC, 30oC, 27oC, 20oC, and 15oC. A preconditioning protocol was established. Oyster’s lengthranging from 9.6 cm to 12.6 cm spawned effectively when exposedtohighertemperatures compared to lower temperatures. Thermal shock spawning was effectiveat 30oC compared to 27oC treatments which spawned constantly over 5 runs. 40oCwaslethal to the experimental animal. No success in stimulating spawningincoldtemperatures at 20oC and 15oC was observed. Spawning rates at 1,338,034cells/650ml/female in 30oC, and 825,735 cells/650ml/female in 27oC respectively, diddiffer significantly at (P>0.05). Immersal periods were shorter in 30oCat 1.82hourscompared to 27oC at 2.05 hours which differ statistically at (P>0.05). Fertilizedeggsproduced from 30oC were better in terms of survival or egg density per hour fromfertilized egg to trochophore stage compared to that produced at ambient temperature27oC.
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