River pollution, high water temperatures and lack of oxygen have been reported as the main causes of fish kills in the province by several fishpond owners. An agriculture official said though only a few fishponds have already reported fish kill incidents, still the fish kills were due to rising water temperatures. Reports of fishkill came from Tocok, parts of Lucao in Daupan and Pugaro, the source added. Earlier, 700 fishponds owners, operators and fisherfolks in this city aired their fears of massive fishkill due to pollution and siltation of the rivers.

Inigo, L. B. (2015, March 20). River pollution from fishpens blamed for fishkill in Dagupan. Manila Bulletin, p. 15.