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Eutrophic conditions during the 2010 fish kill in Bolinao and Anda, Pangasinan, Philippines

2013; Linguagem: Inglês

0119-1144

Ma. Teresa L. Escobar, Lara Patricia A. Sotto, Gil S. Jacinto, Garry Benico, Maria Lourdes San Diego‐McGlone, Rhodora V. Azanza,

Fish Ecology and Management Studies

Coastal water quality conditions in the months prior to and during the 2010 fish kill of farmed milkfish (Chanos chanos) in Bolinao and Anda, Pangasinan were determined to have high total dissolved inorganic nitrogen (0.31 – 24.2 μM) and dissolved phosphate (0.09 – 4.47 μM) along the Guiguiwanen and Caquiputan channels. Low N:P ratios (0.18 – 11.7) coincided with the phytoplankton blooms of Alexandrium spp. and Skeletonema costatum in May and June 2010, respectively. The dense bloom of these two phytoplankton species for two consecutive months coupled with their die-off and decomposition depleted dissolved oxygen ( Key words: Eutrophication, fish kill