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長崎県平戸市生月の大型定置網の垣網に消費電力 55 W の水中灯を取り付け夜間に水中灯を点灯し魚群の出現位置をスキャンニングソナーにより把握した。また水中灯の周辺で点灯前から点灯中点灯後にかけてマアジの標識放流を行い定置網での標識魚の再捕率を調べた。スキャンニングソナーの観察から水中灯点灯時には水中灯周辺での魚群出現が多くなり消灯後には水中灯周辺の魚群が定置網の身網へ移動することを確認した。また水中灯の点灯時に放流したマアジの定置網での再捕率は消灯時の放流に比べて高くなった。A 55 W underwater discharge lamp was set in front of the leader-net of a trap-net in Hirado Island, Nagasaki. The light was left on for 4 hours during the nighttime. We observed fish schools around the trap-net by using a scanning sonar. Fish schools were frequently observed around the lamp when lit and tended to move to the entrance of the trap-net when the lamp was turned off. We also released tagged jack mackerels before, during and after illumination from three locations in front of the leader-net to assess the effect of illumination on the catch performance of the trap-net. The recapture rate of the jack mackerels during illumination was higher than that during other time periods. Thus, the underwater illumination helps by making fish remain around the trap-net and consequently improving the catch performance of trap-net fishing

Fish behavior around a trap-net with the leader-net lit by a low-power underwater lamp