Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Diel Changes in the Diet of Rudarius ercodes: A Diurnal Omnivore and Nocturnal Carnivore

그물코쥐치의 먹이습성의 일별 변화: 낮은 잡식성, 밤은 육식성

  • Kwak, Seok Nam (Korea Inter-university Institutes of Ocean Science) ;
  • Huh, Sung-Hoi (Department of Oceanography, Pukyong National University) ;
  • Choi, Chang Geun (Research Institute of Marine Science and Technology, Korea Maritime University)
  • 곽석남 (부경대학교 해양과학공동연구소) ;
  • 허성회 (부경대학교 해양학과) ;
  • 최창근 (한국해양대학교 해양과학기술연구소)
  • Received : 2006.06.24
  • Accepted : 2006.08.11
  • Published : 2006.09.30
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Abstract

Diel changes in the feeding habits of Rudarius ercodes were investigated in an eelgrass bed of Jindong Bay, Korea. The main food components for R. ercodes (1.6~ 4.3 cm SL) were gammarid amphipods, eelgrass, polychaetes and urochordates. Most dietary items were inhabitants of an eelgrass bed. Diel variations in diet and feeding activity occurred. The diet of R. ercodes underwent changes from eelgrass and gammarid amphipods (omnivore) at day to mainly gammarid amphipods, polychaetes, and urochordates (carnivore) at night. Rudarius ercodes probably took detached eelgrass leaves and grazed live eelgrass during day, whereas feeding on gammarid amphipods, polychaetes, urochordates, and bivalves were facilitated by nocturnal movement and activity of these prey during night. The feeding activity of R. ercodes was also correlated with periods of high tides.

진동만 잘피밭에 서식하는 그물코쥐치의 먹이습성의 일별변화를 조사하였다. 출현한 그물코쥐치는 1.6~4.3 cm SL의 범위였으며, 주요 먹이생물은 단각류에 속하는 옆새우류, 잘피, 갯지렁이류, 그리고 미삭동물이었다. 그물코쥐치의 먹이습성의 일별변화는 뚜렷하였다. 낮에는 잘피와 옆새우류를 주로 먹은 잡식성을, 밤에는 옆새우류, 갯지렁이류, 그리고 미삭동물을 주로 먹는 육식성을 나타내었다. 이와 같은 결과는 낮보다는 밤에 이들 먹이생물의 활동이 활발하여 그물코쥐치가 섭이하기가 용이하였던 것으로 판단된다. 또한 그물코쥐치의 섭이활동은 저조보다는 고조에 활발하였다.

Keywords

Acknowledgement

Supported by : Ministry of Maritime Affairs and Fisheries

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