The shellfish mortality in the growing areas of Bacoor and Sangley Point in Cavite was caused by the low level of salinity in the areas.
In a statement issued by Regional Director Sammy Malvas of the Bureau of Fisheries and Aquatic Resources (BFAR) Region 4, based on the initial laboratory report, the level of salinity in the areas is ranged from 19 to 25 parts per thousand (ppt) which is lower than the required level for shellfish survival which is 27-35 ppt.
Malvas said that the heavy rainfalls in the past few days may have triggered the salinity of the water to drop.
The test, which was conducted by the BFAR Fisheries Protection , Law Enforcement Division and the BFAR National Fisheries Laboratory Division and BFAR4, also showed that dissolved oxygen levels in the sampling areas are low.
The test results further showed that high concentrations of ammonia and phosphates were also detected.
“These chemicals, at high levels, may cause detrimental effects to fish and other marine life,” Malvas added.
The BFAR also clarified that having no latest advisory saying that Manila Bay is positive for red tide, the consumption of said fishing ground is safe.
Malvas, however, advised the general public to collect only live shellfish and wash them properly before cooking.