Coastal Zones and Oceanography

Biography

Biography: Marietta B. Albina

Abstract

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; 40^oC, 30^oC, 27^oC, 20^oC, and 15^oC. 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 30^oC compared to 27^oC treatments which spawned constantly over 5 runs. 40^oC was lethal to the experimental animal. No success in stimulating spawning in cold temperatures at 20^oC and 15^oC was observed. Spawning rates was at 1,338,034 cells/650ml/female in 30^oC, and 825,735 cells/650ml/female in 27^oC respectively, and did differ significantly at (P>0.05). Immersal periods were shorter in 30^oC at 1.82 hours compared to 27^oC at 2.05 hours which differ statistically at (P>0.05). Fertilized eggs produced from 30^oC 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 27^oC.