TRACKING OF MOVEMENT PATTERNS OF CHUM SALMON USING ACOUSTIC TAGGING ALONG THE TOKACHI COAST

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  • 超音波バイオロギング技術による十勝地方沿岸のサケ回遊行動の計測

Abstract

<p> Few studies have investigated the migration behavior of salmon around fishing ports and stationary nets along the Hokkaido coast. Migratory behavior is important when considering catching methods, where salmon are commonly caught using fixed nets. Using acoustic tags and receivers, we investigated salmon migratory behavior around the Port of Atsunai, and set nets up to the mouth of the Tokachi River. Salmon released at the port left that area quickly and could return even if other salmon entered the port. The individuals released from the fixed net returned offshore and likely searched for the mother river. The time from release to capture in the river or surrounding area ranged from 8.4 to 18 days. This study provides basic data for the management of chum salmon resources.</p>

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