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Ascending speed and nocturnal activity of adult masu salmon (Oncorhynchus masou Brevoort) during upstream migration |
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| Authors: | Kazumasa Ohkuma Kunio Abe Manabu Kagaya Kazuyuki Yamaya Motokazu Okukawa Masa-aki Watanabe Takeo Yamamoto |
| Institution: | 1. Salmon Research Department, Fisheries Resources Institute, Japan Fisheries Research and Education Agency, Sapporo, Japan;2. Obama Field station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Obama, Japan |
| Abstract: | We released five adult masu salmon (Oncorhynchus masou) tagged with external transmitters to track their ascending behaviour. The signals of all specimens were recorded in the upper area of the river system. Two patterns of ascending behaviour were recognized: ascending upward immediately after release and ascending during increased river discharge. The fastest ascending speed was about 1000 m h–1. Active movements were detected at night. The signal recording duration at each receiver for each fish was generally brief. Most fish did not stay at the pools where the receivers were installed. |
| Keywords: | ascending behaviour acoustic telemetry masu salmon nocturnal movement |