Studies on the Behavior of Fish Schools in the Main-Net of a Large Scale Set-Net Using Scanning Sonar ( IV ) - The Behaviour of Trigate mackerel Auxis tapeinosoma School in the Playground and the Catching Function of the Playground-

소나 관찰에 의한 대형정치망내 어군행동의 연구 ( IV ) - 헛통에서 몽치다래 어군의 행동과 헛통의 어획기능

  • Published : 1998.03.01


The moving behaviour of Yellowtail Seriola quinqueradiata schools in the main-net of a large scale set-net was investigated in relation to the catching function of the funnel-net by a scanning sonar. The investigation was took place in the Kishihata set-net fishing ground located in Nanao city Ishigawa prefecture, Japan from Nov. 9 to Nov. 13, 1992. The obtained results are summarized as follows; 1. Fish schools showed the greatest number at the playground in the morning and at the bag-net in the afternoon. The fish schools remained long time in the main-net. 2. The rate of fish school through the funnel-net was smaller than that of fish school which is though the playground and bag-net. Because the Yellowtail school changed the shape of school in passing the funnel-net. 3. The rate of entering the bag-net was 24%, among the fish school heading to the outer funnel-net. But, the rate of escaping to the playground was 27%, among the fish school heading to the inner funnel-net. It seems that the structure of the outer funnel-net was not enough to lead the fish to the bag-net. However, the structure of the inner funnel-net was very effective at preventing escape. 4. It is appropriate to haul the net in the morning in considering the number of accumulated fish in the bag-net during the survey.



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  2. 日水誌 v.24 no.1 漁群探知機の記錄から漁群の遊泳速度を測定す ゐ一っの試み 川田三郞;田原陽三
  3. かたがおてぃち v.32 端口におけゐ漁探調査 井上喜洋
  4. 漁具と魚の行動 井上實
  5. 漁類の垂直行動に關する考察 v.9 市原忠義
  6. テレメトリクによる魚の行動 v.17 no.1 枾元皓
  7. 한국어업기술학회지 v.31 no.1 소나 觀察에 의한 大型定置網 魚 群行動의 硏究-Ⅰ,-입망한 정어리 소형군의 행동 金文官;井上喜洋;朴正埴