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‘Dissolved oxygen caused fish float’

Trece Martires City, Cavite — The reported fish kill in Tanza, this province, recently was, in fact, a “fish float” caused by dissolved oxygen or low oxygen levels in the water, the Provincial Government-Environment and Natural Resources (PG-ENRO) officer clarified yesterday.

Citing the report by Tanza Municipal Environment and Natural Resources Office (MENRO), Engineer Roliño Posas said that low oxygen due to changing water temperature was the cause of the incident which the PG-ENRO tagged as a “fish float.”

“Lumutang ang mga isda dahil mababa ang oxygen. Kapag nag-iiba ang water temperature  nagkakaroon ng BOD (biological oxygen demand). Actually mga sariwa at buhay ang mga isda na lumutang at nakuha  (The fish floated due to low oxygen. There is the biological oxygen demand when water temperature changes. The fish gathered were fresh and alive),” Posas said.

He said that fish, mostly the “sap-sap” species, floated in the waters of Barangay Capipisa on October 13 and in Barangays Julugan I and Julugan III on October 14.

The Bureau of Fisheries and Aquatic Resources reported that some 3,500 kilograms (or 3.5 tons) were hauled on 17 “banyeras” (fish containers) in those two days.

Posas said some residents gathered the fish, “took them home, cooked and ate them as they were fresh, alive and in good condition.”