선단 축소를 위한 기선권현망 축소형 대형 어구의 전개 성능 (The opening efficiency of the miniaturized large-scale net for anchovy boat seine to reduce the fleet size)

서지정보

· 발행기관 : 한국수산해양기술학회
· 수록지 정보 : 수산해양기술연구 / 54권 / 1호 / 12 ~ 24페이지
· 저자명 : 안영수, 백영수, 진송한, 장충식, 강명희, 차봉진, 조윤형, 김보연, 차주형

초록

권현망어업의 선단규모를 현재 5척에서 4척으로 축소하는 데에 목적을 두고 축소형 대형어구를 제작하여 해상실험을 행하였으며, 그 결과는 다음과 같았다. 축소형 대형어구로서 어구의 형상을 측정한 결과, 오비기 앞끝, 오비기 중간, 수비 입구, 앞창, 나발그물 입구, 자루그물 입구, 깔때기, 자루그물 뒤끝의 망고 변화폭과 실제 전개율은 각각 8.7～13.3, 28.1～34.2, 31.3～38.5, 22.7～29.6, 20.9～26.4, 17.2～21.1, 7.4～7.9, 11.9～12.4 m와, 51～78, 55～67, 60～73, 47～62, 42～52, 72～89, 78～83, 72～75%로 나타났다. 오비기 앞끝의 그물목줄 연결로 현용어구에 비하여 오비기 앞끝의 전개율이 대폭 개선되어 오비기, 수비그물까지의 정상적인 망고 형성으로 어군의 구집효과가 매우 양호하게 나타났으며, 나발 및 자루그물의 망고도 현용어구에 비하여 높게 형성되었다. 특히 나발그물 부착으로 포켓형상이 대폭 개선되었고 자루그물에서 입망된 어군의 도피가 저감되어 어획효율이 높게 나타났다. 오비기 및 자루그물의 축소에 따라 어구의 예망장력은 2,771～7,110 kg에 불과하여 법정 기관마력인 350마력으로도 충분한 예망이 가능하였으며, 양망 및 투망시간도 현용어구에 비하여 단축되었고 대형 뜸 부착 조업으로 어탐선 없이도 선단조업이 가능하였다.

영어초록

This study was conducted in order to improve opening efficiency of the miniaturized large-scale net for anchovy boat seine gear to reduce the fleet size. Field experiments were performed to observe geometry of nets by catcher boats. When the distances between the two ships were 150, 300 and 450 m, and the speeds of towing nets were 0.6, 0.9, and 1.2 k't, respectively. The vertical opening and actual opening of each part of the miniaturized large-scale net was as follows: the front part of the wing net, 8.7-13.3 m, 51-78%; the middle part of the wing net, 28.1-34.2 m, 55-67%; the entrance of the inside wing net, 31.3-38.5 m, 60-73%; the square and bosom, 22.7-29.6 m, 47-62%; the entrance of the body net, 20.9-26.4 m, 42-52%; the entrance of the bag net, 17.2-21 m, 72-89%; the flapper, 13.2-15.3 m, 78-83%; and the end of the bag net, 13.2-15.7 m, 72-75%. By connecting the net pendants with the front part of the wing net, the opening of the front part of the wing net was significantly improved compared to the traditional gear, which ensured both the wing net and the inside wing net with a normal net height.
This, in turn, increased the efficiency of herding. The height of the body and bag nets was also higher than that of the tradition gear. In particular, the body net attached to the gear significantly improved the pocket shape of the gear and reduced the number of fish that were caught and escaped from the bag net, which increased the rate of fishing. The tension of towing nets was measured approximately between 2,958 and 7,110 kg, which indicates that the fleet can tow nets with 350 ps, the standard engine horse power. The fishing operation time was shortened compared with of the existent net, and the large-scale buoy attachment operation was also possible to operate the ship without fish detecting boat.

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