서해안 안강망의 끝자루 망목크기에 따른 주요 어종의 어획과 혼획
Catches of main species and bycatch according to the codend mesh sizes of stow net on anchor in the West Sea of Korea
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서해안 안강망의 끝자루 망목크기에 따른 주요어종의 어획과 체포금지 어종의 혼획을 비교하기 위하여 끝자루 망목크기가 각각 다른 5종 (세망, 15mm, 25mm, 35mm, 45mm)의 시험어구를 제작한 후 충남 서천 연안에서 조업하는 상업선 (7.93톤)을 임차하여 시험조업을 실시하였다. 본 조사에서는 상업적으로 중요한 어종 중 멸치, 꽃새우, 꼴뚜기, 갑오징어, 꽃게가 다섯 종류의 시험어구 모두에서 우점하였다. 모든 시험어구에서 어획된 어획종은 꽃새우였으며, 끝자루 망목크기별 허용 어획종의 어획량은 세망에서 멸치, 15mm, 25mm, 35mm에서 꽃새우, 45mm에서 꼴뚜기의 어획이 가장 높았다. 각 어구별 혼획을 살펴보면, 세망에서 총 어획 2,171,844g 중에서 혼획 어획물은 623,376g (28.7%)를 차지하였고, 15mm에서 704,451g 중 11,932g (1.7%), 25mm에서 221,432g 중 3,616g (1.6%), 35mm에서 191,052g 중 9,276g (4.9%), 45mm에서 51,431g 중 2,724g (5.3%)으로서 세목망에서의 혼획이 가장 높았으며, 25mm 망목에서의 혼획이 가장 낮은 것으로 나타났다.
Abstract
Experimental fishing was carried out to compare the catches of main species and bycatch according to the codend mesh size (raschel, 15mm, 25mm, 35mm, 45mm) of stow net on anchor in the coastal waters of Seocheon after manufacturing five kinds of fishing gears and commercial fishing boat (7.93 tons) was used for it. Anchovy (Engraulis japonicus), southern rough shrimp (Trachysalambria curvirostris), beka squid (Loligo beka), cuttle fish (Sepia esculenta), swimming crab (Portunus trituberculatus) were dominant on the five kinds of experimental fishing gears. Southern rough shrimp was caught from all kinds of fishing gears and catches of anchovy was highest in the raschel codend, southern rough shrimp for 15mm, 25mm, 35mm codend and beka squid for 45mm codend. Bycatch proportion against total catches was 623,376g (28.7%) for 2,171,844g in raschel, 11,932g (1.7%) for 704,451g in 15mm, 3,616g (1.6%) for 221,432g in 25mm, 9,276g (4.9%) for 191,052g in 35mm and 2,724g (5.3%) for 51,431g in 45mm.
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