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Diel Activity and Feeding Habitat of Pseudobagrus brevicorpus (Pisces: Bagridae) in the Daegacheon Stream of Nakdonggang River, Korea  

Kwak, Yeong-Ho (Department of Life Sciences and Biotechnology, Soonchunhyang University)
Kim, Kang-Rae (Department of Life Sciences and Biotechnology, Soonchunhyang University)
Bang, In-Chul (Department of Life Sciences and Biotechnology, Soonchunhyang University)
Publication Information
Korean Journal of Ichthyology / v.31, no.1, 2019 , pp. 54-61 More about this Journal
Abstract
A study on the diel activities and feeding habits of Pseudobagrus brevicorpus living in the Daegacheon Stream of Nakdonggang River was conducted in September 2017. Diel activity took place during the night, just after sunset and just before sunrise. Pseudobagrus brevicorpus swam in the middle depths, and when they found prey organisms, approached and consumed them immediately. Fish were divided by age into three groups. Prey organisms whose index of relative importance in the stomach contents exceeded 1% belonged to the orders Ephemeroptera (80.8%), Diptera (8.6%), and Trichoptera (8.5%). An index of relative importance by age showed that the Ephemeroptera are very important prey organisms, and the sizes of prey organisms increase with fish growth.
Keywords
Pseudobagrus brevicorpus; diel activity; feeding habits; index of relative importance; Daegacheon Stream;
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