THE fish kill in the waters of Bgy. Buso-buso and Gulod in Laurel and Bgy. Bañaga in Agoncillo, Batangas last week was triggered by depleted level of dissolved oxygen, the Department of Agriculture-Bureau of Fisheries and Aquatic Resources said,
The BFAR advised fish cage operators to closely watch their stocks after it noticed a drop in the dissolved oxygen level.
The Agency regularly conducts monitoring of water quality, including dissolved oxygen level in Taal Lake.
The BFAR said that total allowable number of fish cages in Taal Lake is 6,000 units and out of this number, only 121 units were affected by the fish kill.
The fish kill resulted to over 600 metric tons in losses of tilapia stocks worth P43.13-million.
Fish cage operators in areas where dissolved oxygen level is down were advised to start emergency harvest of marketable sizes of tilapia and use oxygen pumps or aerators as part of mitigating measures.
While heavy rain, sudden change of wind direction and intense heat caused the fisk kill, the BFAR also observed that the overstocking of fish cages in the areas affected also contributed to the depletion of dissolved oxygen in the lake.