June 7, 2011
Temperature blamed for Philippine fish kill
The Philippine Bureau of Fisheries and Aquatic Resources (BFAR) revealed that change in water temperature was the prevalent cause of probably the worst fish kill in Batangas.
BFAR Director Asis Generoso Perez that with the onset of the cold months, the overturning of water temperature in the affected areas caused massive fish kill as its oxygen content was harmful for marine life.
Perez explained that fishes need at least six parts per million (ppm) of oxygen which are present in colder water temperature that has eight ppm of oxygen.
With the temperature overturn, the colder water tends to go down and pushes upwards hotter water, which carries only three ppm of oxygen and some debris.
He said that this kindof environment makes it unfit for fishes to survive, adding that the water samples gathered from the affected areas even contained as low as 2.3 ppm of oxygen.
Perez disclosed that this phenomenon, however, does not happen every summer. The last recorded massive fish kill was three years ago.
Perez added that in terms of damage, the fish kill which started last May 27 was probably the worst – affecting at least 970 metric tons, which include 600 metric tons of bangus, 300 metric tons of tilapia, and the rest such as hito, shrimps, katang, carpa, muwang, and biya.

Affected municipalities are Balete, Lumang Lipa, Mataas na Kahoy, Cuenca, Talisay, Agoncillo, San Nicolas, and Laurel.

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