Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
권호 표지

Comparisons of Fish Assemblages Associated with Eelgrass Bed and Adjacent Unvegetad Habitat in Jindong Bay

진동만 잘피발과 인근 잘피가 없는 해역의 어류군집 비교

  • Kwak, Seok Nam (Korea Inter-university Institutes of Ocean Science, Pukyong National University) ;
  • 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 : 2006.04.04
  • Accepted : 2006.05.15
  • Published : 2006.06.30
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Abstract

Fish assemblages associated with eelgrass beds and unvegetated area were compared based on specimens collected every month in Jindong Bay. The common fish species were Hexagrammos otakii, Acanthopagrus schlegeli, Lateolabrax japonicus, Pholis nebulosa, P. fangi, Leiognathus nuchalis, Repomucenus valenciennei, and Acanthogobius flavimanus. H. otakii, A. schlegeli, P. nebulosa and L. japonicus were higher abundance in an eelgrass bed than unvegetated area, whereas P. fangi, R. valenciennei and A. flavimanus were higher in unvegetated area. Sillago japonicus, Hippocampus japonica, Takifugu niphobles, Pseudoblennius percoides, Sebastes inermis, Syngnathus schlegeli, Sebastes schlegeli were found in an eelgrass bed, but not in unvegetated area. Most of fish species were primarily small fish species or juveniles of fish species in an eelgrass bed, while larger fish species were found in unvegetated area. The eelgrass bed in Jindong Bay seem to play a nursery role for fishes. Seasonal variations in both species composition and abundance were large in two habitats; higher number of species and individuals occurred May 2002, and April 2002 to July 2002, while biomass was the highest in April 2002 and July 2002. Fish numbers as well as biomass were lowest in January 2002. Species richness, number of individuals and biomass of fishes in an eelgrass bed were significantly higher than those of in unvegetated area. These result suggest that differences in fish species richness and abundances are primarily related to habitat structure. Different habitat preferences were evidenced for the juveniles and adult of several fish species.

진동만 다구리 잘피밭과 인근 잘피가 없는 해역의 어류군집을 비교하기 위해서 2002년 1월부터 12월까지 소형 빔 트롤을 이용하여 어류를 매월 채집하였다. 조사기간 동안 우점하였던 쥐노래미, 감성돔, 농어, 베도라치, 흰베도라치, 주둥치, 문절망둑, 그리고 실양태가 우점하였다. 특히 감성돔과 농어는 잘피밭에서 문절망둑과 실양태는 잘피가 없는 해역에서 많이 출현하였다. 청보리멸, 산호해마, 복섬 및 돌팍망둑, 실고기, 흰꼬리볼락 및 볼락 등은 잘피밭에서만, 양태 및 날개망둑 등은 잘피가 없는 해역에서만 출현하였다. 본 조사해역에서 출현한 어류는 대부분이 소형 어종이거나 대형 어종의 유어들로 구성되어 있어서, 잘피밭이 작은 크기의 어종들에게 좋은 성육장의 역할을 하고 있었다. 어류군집은 뚜렷한 계절변동을 보였는데, 출현 종수는 2002년 5월에, 출현 개체수는 2002년 4월에서 7월 사이에 아주 높았다. 한편 생체량은 2002년 4월과 7월에 가장 높은 수치를 나타내었다. 대체적으로 겨울철에는 출현 종수, 개체수 및 생체량이 모두 낮았다. 잘피밭과 잘피가 없는 인근해역의 어류 군집을 비교해보면, 출현 종수, 개체수 및 생체량이 모두 잘피밭에서 높게 나타났다. 이와 같은 결과는 잘피밭은 잘피가 밀생되어 있어서 먹이 이용 가능성 및 포식자로부터 보호받을 수 있는 서식처의 특성에 의한 것으로 주요 우점종의 체장분포에서도 두 서식처간의 차이가 뚜렷하게 나타났다.

Keywords

Acknowledgement

Supported by : Ministry of Maritime Affairs and Fisheries

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