定置網漁場における天然礁に関連する魚群の行動

概要

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Fish behaviour surveys in the Nayaura set-net fishing ground off Mie prefecture were carried out in relation to the fish leading effect of the natural bank.The topography of the fishing ground was surveyed by a side-scan-sonar and characterized by a long bank surrounded by large and small rocky reefs, which extend parallel to the leadernet from the shore to the mouth of set-net. A large number of fish schools, identified as Japanese anchovy Engraulis japonica from the catch data, were observed by the scanning sonar and recorded mostly in the daytime. The size of fish schools tended to be larger inside the natural bank area than outside. The natural bank in front of the leader-net affected the migrating route of fish schools. The migrating behaviour of fish schools were classified into seven categories. Of them, about 8% of the fish schools were seen to approach and move along the leader-net.
日本水産學會の論文