Korean Journal of Ichthyology (한국어류학회지)

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

낙동강 수계 대가천의 꼬치동자개 Pseudobagrus brevicorpus (Pisces: Bagridae)의 일주기 활동 및 식성

  • 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)
  • 곽영호 (순천향대학교 생명시스템학과) ;
  • 김강래 (순천향대학교 생명시스템학과) ;
  • 방인철 (순천향대학교 생명시스템학과)
  • Received : 2019.03.12
  • Accepted : 2019.03.26
  • Published : 2019.03.31
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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.

꼬치동자개 Pseudobagrus brevicorpus의 일주기활동과 식성에 관한 연구를 낙동강 지류인 대가천에서 실시하였다. 일주기 활동은 일몰 직후와 일출 전에 2회에 걸쳐 일어났다. 주로 하천의 중층대에서 활동을 하며 먹이생물이 발견하면 접근하여 흡입하는 행동을 취했다. 연령은 3개 그룹으로 구분되었고 위내용물 중 상대중요성지수 (index of relative importance, IRI)가 1%를 초과하는 먹이생물은 하루살이목 (Ephemeroptera) 80.8%, 파리목 (Diptera) 8.6%, 날도래목 (Trichoptera) 8.5% 순으로 나타났다. 또한 모든 연령군에서 하루살이목이 매우 중요한 먹이생물이었고, 성장함에 따라 먹이생물의 크기가 증가하였다.

Keywords

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