Mass fish kill in Laguna de Bay has been traced to four major causes - dissolved oxygen, pollution, turbidity, and diseases. Eighty percent of reported fish kill incidents occur between May and September. These were the results of a study on mass fish kill occurrences in Laguna Lake from 1972 to 1998 done by the researchers at the Binangonan Freshwater Station in Binangonan, Rizal, of Southeast Asian Fisheries Development Center-Aquaculture Department (SEAFDEC-AQD). The report was presented at the 9th International Conference on the Conservation and Management of Lakes held not long ago in Japan.

Major causes of Laguna mass fish kill traced. (2002, July 18). Manila Bulletin, p. B-10.