Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
권호 표지

Improving of the Fishing Gear and Development of the Automatic Operation System in the Anchovy Boat Seine- II Analysis of escaping behaviour of anchovy in relation to underwater light and towing flow velocity

기선권현망어업의 어구개량과 자동화조업시스템 개발- II 수중광 및 예망유속과 멸치의 도피반응 행동 분석

  • 김용해 (경상대학교 해양산업연구소) ;
  • 장충식 (경상대학교 해양산업연구소) ;
  • 안영수 (경상대학교 해양산업연구소) ;
  • 김형석 (부경대학교)
  • Published : 2001.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

Escape behaviour of the anchovy (Engralius japonica, total length 4-7cm) at the inside wing net and bag net in the anchovy boat seine was observed by underwater video camera in order to clarify the relationship between visual stimulus of the gear or relative water flow inside gear and reacting behaviour. The vertical attenuation coefficient of underwater illuminance in the offshore of Keoje island and Tongyoung was ranged from 0.24 to 1.03 and it could be affect visual range and visual contrast of the fishing gear. The relative water flow at the joint part between inside wing and bagnet while towing was 1.5 times higher than at the middle part of inside wing or fore part of bag net, but it was estimated under than maximum swimming speed of 4-7 cm anchovy. The mean escaping number of anchovy from end part of inside wing of 30 cm mesh to out side for a minute within visual range of video camera was 455 and anchovy swimming forward from bag net through flapper was 308. These results revealed anchovy could escape as voluntary response in spite of higher visual stimulus or higher water flow.

1999년 5월 29일부터 6월 30일까지의 남해안에서의 수심에 따른 수중광의 변화와 조업시간의 경과에 따른 예망 상대유속을 측정하고, 권현망어구에 대한 체장 4~7cm정도 되는 멸치들의 도피 반응행동을 관찰하고 분석한 결과는 다음과 같다. 1) 남해안 통영, 거제 부근 멸치어장에서 수심에 대한 수중광의 변화를 자연대수 곡선식으로 나타내면 광흡수 계수 c는 대표적인 관측점에서 주로 0.24~1.03 범위로 나타나서, 멸치의 어구에 대한 시인도가 어장에 따라 클 것으로 보인다. 2) 권현망어구의 원형그물과 1/2축소그물의 자루그물 입구부분의 상대유속을 기준으로 할때, 수비와 자루의 연결부분의 유속비는 평균 1.46, 자루부분의 유속비는 평균 0.67로 나타나서, 어구의 부위에 따른 상대유속변화가 멸치의 유영운동과 도피운동에 영향을 줄 것으로 보인다. 축소된 권형망어구에 있어서의 멸치의 대망행동을 관찰한 결과 수비와 자루연결부분에서 빠져나가는 1분당 멸치도피수는 평균 455미 정도였으며, 자루의 앞에서 예인방향으로 유영하는 깔대기를 빠져나가는 1분당 멸치도피 수는 평균 308미 정도로 나타나서, 어구 전체적으로는 상당수의 멸치들이 능동적인 도피행동을 나타내는 것으로 추측된다.

Keywords

References

  1. Bull. Korean Soc. Fish. Tech. v.33 no.2 The opening Efficiency of anchovy boat seine An, Y.-S;Jang, C.-S.;Lee, J.-H
  2. Fish. Bull v.70 Swimming and feeding behavior of larval anchovy, Engraulis mordax Hunter, J. R.
  3. Fish. Bull. v.83 visual threshold for schooling in northern anchovy Engraulis mordax Hunter, J. R.;Nicholl, R.
  4. Bull. Koren Soc. Fish. Tech. v.36 no.4 Improving of the fishing gear and development of the automatic operation system in the anchovy obat seine -Ⅰ.-Underwater geometry of the model net- Jang, C.-S.;Kim, Y.-H.;An, Y.-S.
  5. Bull. Japanese Soc. Sci. Fish. v.56 no.7 Driving anchovy larvae by large mesh wings of pair midwater trawl Kawamura, G.;Tabata, K.
  6. Bull. Korean Soc. Fish. Tech. v.33 no.3 Modelling relative water flow and its sensitvity of fish in a towed fishing gear Kim, Y.-H.
  7. Bull. Korean Soc. Fish. Tech. v.34 no.1 Modelling on contrast threshold and minimum resolvable angle of fish vision Kim, Y.-H.
  8. J. Korean Fish. Soc. v.30 no.6 Modelling of swimming ability limits for marine fish Kim, Y.-H.;Wardle, C.S.
  9. Fisheries Research v.34 Modelling the visual stimulus of towed fishing gear Kim, Y.-H.;Wardle, C.S.
  10. Publ. Inst. Mar. Sci. Nat. Fish. Univ. v.8 The swimming ability of anchovy Lee, B.-G.
  11. Bull. Korean Soc. Fish. Tech. v.15 no.2 Study on the anchovy boat seine - Ⅲ Lee, B.-G.;Su, Y.-T.;Yum, M.;Han, H.
  12. Fisheries Research v.28 behavioural responses of larval anchovy schools herded within large-mesh wings of trawl net Lee, K.-T.;Lee, M.-A.;Wang, J.-P.
  13. J. Fish. Soc. v.22 no.1 Acoustic estimation of biomass and dispelling of larval anchovy herded by large-mesh wings of trawlnet Lee, M. A.;Lee, K. T. Wang, J. P.
  14. Nippon Suisan Gakkaishi v.55 no.11 An estimation of capture probability on anchovy larvae Engraulis japonicus with a 60cm-BONGO net Nakamura, M.
  15. Behaviour of teleost fishes, (2nd Edition) Fish behaviour and fishing gear Wardle, C. S.;T. J. Pitcher(Ed.)
  16. Larvae. Fish. Bull. v.79 no.1 Burst swimming performance of northern anchovy, Engraulis nordax Webb, P. W.;Corolla, R. T.
  17. J. Korean Fish. Soc. v.13 no.3 Optical properties of sea water in the fishing ground of anchovy Yang, Y.-R.