The 2013 fish kill event in Ilog River-Estuary, Negros Occidental, Philippines

  • Abner A. Bucol Silliman University
  • Paulina S. Aspilla Silliman University
  • Floredel D. Galon Palawan State University
  • Reynaldo T. Tababa Central Philippines State University
  • Jessica O. Pacalioga University of St. La Salle
Keywords: estuary, fish kill, fishery, organic pollution


A fish kill (fin fishes and crustaceans) event was documented on April 22–26, 2013 in Ilog River-Estuary, Negros Occidental, in central Philippines. This event was characterized by reduced dissolved oxygen (hypoxia) which ranged from 0.6–3.86 mg O2/L (mean 1.98 ± 0.49 s.e.) during the first day of the event. Several factors leading to the occurrence of the fish kill are discussed. Small-scale trawling, other fishing gears, and related activities were monitored during the months of April, May, September, October, December 2013 and January 2014 to further determine the possible impact of the fish kill event to the local fishery.