Distribution and composition of fish fauna between wet and dry season in Batang Kerang, Balai Ringin, Sarawak

The composition and distribution of freshwater fishes between wet and dry season at Batang Kerang River, Balai Ringin was studied from July 2005 to April 2006. A total of 473 individuals of fish were caught during the study. More individuals of fish were caught during the dry season compared with the wet season. However, there is no significant difference of species density between both seasons. The dominant species is Oxygaster anomalura. The river contains numerous fish species with the majority capable of enduring extreme conditions. There are significance differences of water quality such as dissolved oxygen, biological oxygen demand (BOD5), depth, total suspended solids, orthophosphate (P034-) concentration and water transparency between both dry and wet seasons