The UP Marine Sciences Institute (UPMSI) said yesterday that a preliminary investigation on the cause on the massive fish kill that occurred in Bolinao, Pangasinan last Feb.1 can be traced to two circumstances. In a statement, the UPMSI said that the fishkill coincided with a bloom of a red-pigmented phytoplankton identified as "pro-centrum minimum" that has been reported to be associated with Eutrophied waters.

Plankton bloom, low oxygen level blame for fishkill. (2002, February 8). Manila Bulletin, p. G-1.