여수 연안 낭장망에서 어획된 어류의 종조성 및 양적변동
Species composition and quantitative fluctuation of fishes collected by gape net in coastal waters of Yeosu, Korea
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초록
전라남도 여수시 돌산읍 두문리 소재의 연안 정치망 어장에서 어획된 어류를 대상으로 2000년 3월부터 11월까지 9개월간 매월 1회씩 어획물을 채집하여 어류군집의 종조성 및 양적변동을 조사하였다. 채집된 어류는 42과 56속 63종이 출현하였고, 2,230,297개체(생체량: 16,076.8㎏)가 어획되었으며, 채집된 어류 중 농어목과 청어목, 복어목 어류가 총 45종으로 전체 출현 종수의 71.4%를 차지하여 가장 우점하는 목들로 나타났다. 개체수와 생체량에서 멸치, 갈치, 삼치, 준치 등이 우점종으로 나타났으며, 출현 개체수와 생체량은 고수온인 봄과 여름, 가을에 높게 나타났고, 저수온기의 겨울에 낮게 나타나 수온과 밀접한 관계가 있었다. 조사 동안 출현한 어종 중 개체수에서 많았던 어종은 멸치, 정어리, 갈치로 이들 3종이 2,211,642개체로 전 출현 개체수의 99.2%를 차지하여 우점종으로 나타났으며, 생체량의 경우에 멸치가 12,807.2㎏, 총 생체량의 79.7%로 가장 우점하였다. 본 해역에서 우점종인 멸치, 정어리, 갈치, 준치, 주둥치와 수온과 관계는 Y= 0.0864χ - 0.2311 (r2 = 0.3516)였으며, 결정계수가 0.3516으로 나타났다. 주요 어종의 출현빈도를 보면, 멸치가 연중 출현하였고, 준치, 갈치, 삼치, 고등어, 전어, 꼬치고기, 참조기가 본 해역을 우점하는 회유성어종이면서 주거종으로 나타났다.
Abstract
To analyze quantitative fluctuation in abundance and species composition in coastal waters of Dolsan, Yeosu, the fished were collected by gape net from March to November, 2000. The fish species caught by set net collected fishes were identified 63 species, 56 families, 42 orders, and the number of appearance and biomass was 2,230,297 individuals and 16,076.8kg. The most dominant orders were Perciformes, Clupeiformes and Tetraodontiformes which accounted for 71.4% of the total. The dominant species in number were Engraulis japonicus, Sardinops melanostictus, Trichiurus lepturus which accounted for 99.2% (2,211,642 individuals) of the total fishes collected. The dominant species in biomass were Engraulis japonicus which accounted for 79.7% (12,807g) of the total fishes collected. Temporal occurence of the dominant species such as the Engraulis japonicus, Sardinops melanostictus, Trichiurus japonicus, Ilisha elongata, Leiognathus nuchalis was closely correlated with water temperature, which is expressed as following regression equation, y=0.0864x-0.2311(r2=0.3516). The species collected during the sampling yearly period were Engraulis japonicus, and migratory fish were Ilisha elongata, Trichiurus japonicus, Scomberomorus nipphnius, Scomber japonicus, Konosirus punctatus, Sphyraena pinguis, Pseudosciaena polyactis.
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