북태평양 중부 해산어장에 있어서 저층 선주낙의 어획실태
Fishing investigation of vertical bottom longline fisheries in sea mount of central northern Pacific
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참고문헌
초록
2004. 7. 1－8. 25일까지 북태평양 중부의 공해 해산어장(30°－42°N, 170°－175°E)에서 저층 선주낙에 의한 어획 시험 결과를 요약하면 다음과 같다. 조사를 실시한 43일 동 안 모 두 57회의 조업에서 7,956바스켓을 투승하여 19종, 21,092.4kg을 어획하였다. 일일 평균 185바스켓을 투승하여 4.3시간 동안 침적시키고, 3.7시간 동안 양승한 일일 평균 어획량은 490.5kg으로 나타났다. 어획시험에서 돔발상어 66.3%, 검정꼬리민태 11.7%, 한벌홍감팽 9.8%가 어획되어 주 어획 종으로 나타났으며, 이 들 주어획 종의 입 평균 내경은 6.9cm, 6.8cm, 4.8cm로나타났다. 어획물의 어장별 조획율은 D어장, C어장, A어장, F어장, B어장, E어장 순으로 나타났다. 어획 수심별 조획율은 450－500m, 350－400m, 300－350m, 400－450m, 1,000－1,100m, 500－550m 순으로 나타났으며, 어획수심별 주 어획 종은 300－400m 층에서 돔발상어, 300?550m 층에서 가시줄상어, 1,000m 이심에서 검정꼬리민태로 나타났다. 낚시 종류별 조획율에서 돔발상어는 긴형 6호, 가시줄상어는 둥근형 5호에서 높게 나타났다. 미끼별 조획율에서 돔발상어는 오징어, 한벌홍감팽은 꽁치와 장어, 가시줄상어는 꽁치를 사용하였을 때 높게 나타났다. 조업중 어구의 분실과 파손으로 많은 시간이 소요됨으로 이를 감소시키고, 순 조업시간을 연장시켜야 할 것으로 생각된다.
Abstract
This study was conducted to survey the catches of vertical bottom longline fisheries in the sea mount of central northern Pacific(30°－42°N, 170°－175°E), during the period of July 1 to August 25, 2004 by commercial fishing vessel. The number of 57 test fishing was carried out in the central northern Pacific during 43 days and the total catches were 21,092.4kg as 19 fish species,CPUE/day and catches/day were 185 baskets and 490.5kg, respectively. Main fish species caught from the experimental fishing were Squalus mitsukurii(66.3%), Coelorhyrchus asperocephaius(11.7%) and Helicolenus avius(9.8%) and, average inside diameter for fish mouth was 4.0cm over. Catch ratio according to each fishing ground was the order of F, D, J, B and C. Catch ratio for water depth was the order of 450－500m, 350－400m, 300－350m, 400－450m, 1000－1100m and 500－550m and, main species by water depth was Squalus mitsukuriifor 300－400m, Etmopterus luciferfor 300－550m, Coelorhyrchus sperocephaiusfor 1,000m over. Catch ratio according to the kind of hooks was higher at the hook no. 6 for Squalus mitsukuriiand no. 5 for Etmopterus luciferand, catch ratio by baits was higher at squid for Squalus mitsukurii, saury and eel for Helicolenus aviusand saury for Etmopterus lucifer. Accordingly, it is thought that the extension of fishing hours is needed with the reduction of damage and loss for fishing gears during fishing operation.
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