音響調査による熊野灘沿岸域の魚群分布と環境

概要

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The distribution and abundance of pelagic fish schools migrating to the southern coastal area of Kumano-nada Sea were investigated in relation to oceanographic environments by means of the acoustic method. Fish schools occurred more frequently in the area deeper than 50m than in the shallower area near the set-net. The distribution and abundance of fish schools in the area deeper than 50m changed with the coastal oceanographic conditions associated with the fluctuation of the Kuroshio path. The increase in fish abundance occurred in response to the intrusion of warm water from the Kuroshio to the coastal region. It was suggested that the increase may be related with an improvement in the food situation for fish as well as the direct effect of temperature on fish behaviour. The amount of catch per day of the set-net corresponded to 0.3-0.7% of the fish abundance estimated by the acoustic method in the survey area.
日本水産學會の論文