Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Study of the Fish Fauna Associated with Drifting Seaweed in Northeastern Coastal Waters of Cheju, Korea

제주도 동북 해역의 유조 (流藻) 어류상에 관한 연구

박정호;노섬

  • Published : 20020000
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Abstract

The study of the fish fauna associated with drifting seaweed in coastal waters is very important for evaluation of potential fishery economics. Limited information is available on the biodiversity, distribution and movement of this fauna despite its economic importance to fisheries. This study investigated seasonal variation and species composition of the fish fauna associated with drifting seaweed present in coastal waters of northeastern Cheju from March 2001 to January 2002. Drifting seaweed clumps were mostly composed of Sargassum spp. (such as S. horneri, S. ringglodium and S. micarcanthum), which showed seasonal variation in their abundance. Drifting seaweed was more abundant in spring and summer than in autumn and winter. The total number of individuals collected (6,598) belonged to 51 species, 32 families and 8 orders. Some species, such as Petroscirtes breviceps, Syngnathus schlegeli and Histrio histrio, stayed in drifting seaweed more than four months. In contrast, Exocoetidae spp., Apogon spp., Diodon holocanthus, Scatophagus argus, Lobotes surinamensis, Seriola dumerili and Siganus fuscescens stayed in drifting seaweed only one month. Order Perciformes (33 species and 20 families) had the highest abundance during the sampling period. The number of species varied monthly, with the highest number of species (25 spp.) in July 2001 and the lowest (3 spp.) in March 2001. Diversity of the fish fauna was highest in July 2001 and lowest in October 2001. It was assumed that the diversity and evenness of the fish fauna in northeastern coastal waters of Cheju were related to water temperature, reproduction and primary production.

어류 자치어의 회유 경로를 파악하기 위한 기초 자료로서, 2001년 3월부터 2002년 1월까지 제주도 동북 해역에서 유조 어류상을 조사하였다. 유조를 구성하는 해조류는 대부분이 모자반류 (Sargassum spp.)였고, 유조의 크기는 계절별로 뚜렷한 변화를 가지며, 6, 7월에 절정을 이룬다. 조사기간 중 유조와 함께 채집된 어류는, 과 수준까지 분류한 3종을 포함하여 총 8목 32과 51종이었으며, 그 중 목단위에 있어서는 농어목 (Perciformes)이 20과 33종으로 가장 많았다. 월 별 종 다양도 지수는, 두줄베도라치가 거의 대부분인 10월에 가장 낮았고, 각 출현종의 개체수가 고루 분포하는 7월에 가장 높았다. 실고기, 두줄베도라치 및 노랑씬벵이 등은 유조 아래에서 4개월이상 오래 머무는데 반해, 연어병치, 백미돔 및 동갈돔류 등의 어류들은 한달 정도의 짧은 기간동안만 유조에 머문다.

Keywords

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