Diet of Ompok hypophthalmus in Rungan Floodplain River in Palangkaraya, Central Kalimantan

Abstract

The aims of the research were identify prey species of Ompok hypophthalmus and its availability Rungan floodplain river in Palangkaraya. The collection of O. hypophthalmus from floodplain ecosystem were done monthly during October to November 2013 when water level decrease and December 2013 to January 2014 when water level increase. In the same time of O. hypophthalmus, an analysis of benthos availability in water ecosystems were performed. A total of 183 stomachs of O. hypophthalmus were collected and analyzed systematically. Prey species was identified and the percentage was calculated. The most common prey were shrimp, insect, juvenile fish, and other unidentified prey. The prey species compositions were varies monthly. In October 2013, prey species was dominated by shrimp (61%). In November, the prey were fish juvenile (44%). Insect was dominant in the stomach of O. hypophthalmus which was collected during December (54%). In January, fish juvenile was found dominant in the stomach of O. hypophthalmus (60%). The different of stomach composition was affected by food availability and season. Annelids, insect, and Trichoptera was abundance in December (12.130 ind/m 2 ).