여수 연안 승망 어장에서 어획된 어업생물의 계절별 분포특성
Seasonal distribution characteristics of fishes catched by a funnel net in the coastal water off Dolsan Island, Yeosu
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여수 돌산도 동쪽 해역의 승망어장에서 2002년 1월부터 2003년 12월까지 2년 동안 양망시마다 조사한 수온 및 어업생물의 어획량 자료를 이용하여 어업생물의 계절별 분포 특성을 주성분분석을 이용하여 조사한 결과를 요약하면 다음과 같다. 여수 돌산도 동쪽 해역에 설치한 승망 어구에 어획된 어업생물은 2002년에 총 21종, 2003년에 총 17종이었으며, 2년 동안 어류가 20종, 두족류가 3종으로 총 23종이었다. 양망당 어획된 개체수는 2002년에 감성돔, 농어, 숭어, 복락 순으로 86.1%의 어업생물이 어획되었고, 2003년에 농어, 복섬, 숭어, 감성돔 순으로 79.9%가 어획되었으며, 2년 동안 감성돔 26.7%, 농어 23.8%, 숭어 17.7% 순으로 혼획되었다. 여수 돌산도 동쪽 해역에 설치한 승망 어구에서 어획된 어업생물의 출현종수와 양망당 개체수는 2002년과 2003년에 큰 편차를 나타내고 있으나 대체로 겨울을 제외한 전 계절에 많았으며, 특히 출현종수는 여름에 가장 다양하였고, 양망당 개체수는 가을에 가장 풍부하였다. 정착성 어류인 감성돔은 전 계절을 통하여 어획되었으며, 회유성 어류인 농어와 숭어가 다량으로 어획되면서 계절적인 종조성과 출현량의 변화에 크게 영향을 미치고 있었다. 승망 어구에서 어획된 주요 어업생물은 2002년과 2003년에 다소 차이를 나타내고는 있지만, 뚜렷한 계절변동을 보였다. 계절별 어획량은 봄과 여름에는 농어와 숭어, 가을에는 복섬, 겨울에는 볼락과 붉은메기가 주로 어획되었으며, 전 계절에 걸쳐 감성돔이 지속적으로 어획되었으나 특히 가을에 더 많이 어획되었다.
Abstract
A study on the species composition and seasonal variations of fishes catched by a funnel net was carried out in the coastal water off Dolsan Island, Yeosu from 2002 to 2003. During the study period, a total of 23 fishes species were catched., Seabream(Acanthopagrus schlegeli), sea bass(Lateolabrax japonicus), mullet(Mugil cephalus), puffer(Takifugu niphobles), and rockfish(Sebastes inermis) predominated. These five species accounted for 85.1% of the total number of fishes catched. Seasonal peaks of number of species occurred in summer, while those of number of individuals occurred in autumn. The lowest number of species and individuals were observed in winter. The large annual variation of diversity indices were observed from May to August. These large annual variation of diversity indices were mainly due to predominance of seabream, sea bass and mullet which accounted for most of all fishes catched. The seasonal variations of fishes showed that sea bass and mullet were catched mainly from spring to summer, seabream and puffer were catched mainly in autumn, and rockfish and brotula(Hoplobrotula armata) were catched mainly in winter.
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