Abstract
Biotelemetry system was used to investigate the horizontal swimming behaviour of chum salmon Oncorhynchus keta in early migratory season at Okhtsk Sea off the coast of Shiretoko Peninsula, Hokkaido, and the data of two examinations were analyzed.In both examinations, the direction of horizontal migration was north-east about along the peninsula.The average of horizontal swimming speed from start to end of pursuit was 0.92m/s (1.23FL/s). The maximum speed measured at one h intervals was 2.43m/s (3.42FL/s).
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