• Title, Summary, Keyword: fishing efficiency, ratio for entering

Search Result 1, Processing Time 0.021 seconds

Studies on the Development of the Fishing System of Set Net in the Coast of Jeju Island - I. Comparative of Fishing Efficiency of Rectangular Set Net and Pound Net by the Model Net - (제주도 연안 정치망 조업시스템 개발에 관한 연구 - I. 모형어구에 의한 각망과 낙망의 어획성능 비교 -)

  • 김종범;김석종
    • Journal of the Korean Society of Fisheries and Ocean Technology
    • /
    • v.37 no.3
    • /
    • pp.223-231
    • /
    • 2001
  • For the purpose of providing the basic data on the improved fishing gear and the man power saving, which contribute to enhance fishing efficiency of set net in the coast of Jeju Island, this study executed the test of fish tank by reducing these actual nets by 1/30 and using the manufactured model nets, and observed and interpreted the behaviors of entering and escaping of the schools of mackerel Scomber japonicus, horse mackerel Trachurus japonicus and rabbit fish Siganus fuscescens. Thereby the result is as follows ; 1. After the elapsed time of 60 seconds, in case of rectangular set net, the ratio for entering by a school of fish marked 50% with mackerel, 18% with horse mackerel and 28% with rabbit fish, and in case of pound net, the ratio for entering net by a school of fish marked 70% with mackerel, 60% with horse mackerel and 30% with rabbit fish. 2. After the elapsed time of 60 seconds, in case of rectangular set net, the ratio for escaping by a school of fish marked 70% with mackerel, 40% with horse mackerel and 24% with rabbit fish, and in case of pound net, the ratio for escaping from net by a school of fish marked 0% with mackerel, 0% with horse mackerel and 3% with rabbit fish. 3. After the elapsed time of 60 seconds, in case of rectangular set net, the ratio for remaining by a school of fish marked 30% with mackerel, 60% with horse mackerel and 76% with rabbit fish, and in case of pound net, the ratio for remaining by a school of fish marked 100% with mackerel, 100% with horse mackerel and 97% with rabbit fish.

  • PDF