Giant clam hatchery, ocean nursery and stock enhancement. 2007. Mingoa-Licuanan & Gomez. 110 p
Giant Clam
Giant clams are listed under CITES in 1985. In the Philippines, Tridacna gigas is considered as extinct.
The first batch of giant clam was stocked in cages in Carbin Reef, Sagay Marine Reserve in March 2006 and followed by another stocking in August 2006 in Kawit Reef, Malalison Island.
Verification of developed and established technologies (click titles below to expand/collapse)
Growth and survival of hatchery-reared giant clam, Tridacna gigas, in ocean nurseries in Negros and Panay Islands
Stocking of 2 batches in Sagay Marine Reserve and Malalison Island has been continued from the last year, and a new batch has been newly stocked in Igang Marine Substation (Guimaras, SEAFDEC/AQD).
Growth performance and environmental condition have been regularly monitored and compared among 3 stocking sites.
There were no significant differences in growth rates between cages within one site.
A significantly higher growth rate was observed in clams grown in Igang than in Sagay and Culasi (ANOVA: p<0.001).
A significantly higher survival was observed in clams grown in Igang and Sagay than in Culasi (ANOVA: p<0.001).
There were no significant differences in temperature, salinity and total suspended solids between sites. Depth is the only factor that differs between sites with the Igang ocean nursery situated in the shallowest and the Culasi ocean nursery in the deepest area.
There was no significant correlation between growth rates and temperature, salinity and total suspended solids in Sagay, Culasi and Igang.
There was no significant correlation between survival and temperature, salinity and total suspended solids in Sagay and Culasi. Survival was negatively correlated with temperature (Pearson correlation=-0.779, p<0.05) but not with salinity and total suspended solids in Igang.
Proposed Activities for 2008
Socioeconomic analysis of stock enhancement of abalone and giant clams in Sagay Marine Reserve in the Philippines
The objective of this study is to determine the socioeconomic effects of stock enhancement activities being conducted in SMR located in the northern part of Negros Occidental in the Philippines; and assess the efficiency of allocation of economic and social gains to intended beneficiaries and stakeholders. To achieve this goal, the following activities are planned in 2008:
Continuation of analysis of survey data, including ex-ante evaluation of estimates of appropriate costs of and benefits from stock enhancement in project sites;
Conduct of seminars to present results to stakeholders in project sites.
Giant clams are listed under CITES in 1985. In the Philippines, Tridacna gigas is considered as extinct.