Marietta B. Albina
Samar State University, Philippines
Marietta Albina has completed her Master's degree on Fisheries Technology major in Aquaculture Technology as her field of specialization at SSU-College of Fisheries and Marine Sciences and presently assigned as faculty researcher at the same university at the office of the Vice President for Planning, Research and Extension Services
The study was conducted to gather first hand data on the feasibility of oyster hatchery in the Philippines specifically in Samar as one of the primary producers of oysters in Region VIII, Visayas area. Induced spawning Philippine cupped oyster Crassostrea iredali Faustino, 1932 through thermal shock was investigated. Five (5), temperatures was tested namely; 40oC, 30oC, 27oC, 20oC, and 15oC. A pre-conditioning protocol was established. Oyster’s length ranging from 9.6 to 12.6cm spawned effectively when exposed to higher temperatures compared to lower temperatures. Induced spawning was effective at 30oC compared to 27oC treatments which spawned constantly over 5 runs. 40oC was lethal to the experimental animal. No success in stimulating spawning in cold temperatures at 20oC and 15oC was observed. Spawning rates was at 1,338,034 cells/650ml/female in 30oC, and 825,735 cells/650ml/female in 27oC respectively, and did differ significantly at (P>0.05). Immersal periods were shorter in 30oC at 1.82 hours compared to 27oC at 2.05 hours which differ statistically at (P>0.05). Fertilized eggs produced from 30oC was better in terms of survival or egg density per hour from fertilized egg to trocophore stage compared to that of produced at ambient temperature 27oC.