2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 11:45 AM - 12:00 PM | THE MIGRATION OF A NEARLY-EXTINCT POPULATION OF MASU SALMON TO STREAMS IN THE PIRIKA DAM RESERVOIR IN NORTHERN JAPAN | 410 A
THE MIGRATION OF A NEARLY-EXTINCT POPULATION OF MASU SALMON TO STREAMS IN THE PIRIKA DAM RESERVOIR IN NORTHERN JAPAN
After construction of the Pirika Dam in Hokkaido, northern Japan, the masu salmon (Oncorhynchus masou) population decreased in two of the three streams flowing into the reservoir. To restore their population, it is necessary to know whether masu salmon in the reservoir migrate to these streams. We examined the behavior of juvenile masu salmon in the reservoir using acoustic biotelemetry from August to October 2016 and May to August 2017. We released 20 individuals with acoustic transmitters in 2016 and 30 in 2017. Receivers were installed in the reservoir and at the three stream inlets. More than 40% of the released salmon were recorded at the Chushibetsu stream inlet in both years, while only one (2017) and three (2016) individuals were confirmed at the other stream inlets. Our results suggest that mature masu salmon from the fishway connecting the Chushibetsu stream and the main river below the Pirika dam were conserved and that releasing masu salmon in the other two streams might help the populations in the two streams to recover.
- Restoration
- Connectivity
- Conservation
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Presenters/Authors
Masanori Nunokawa
(), Civil Engineering Research Institute for Cold region, Public Works Reseaech Institute, nunokawa-m@ceri.go.jp;
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Kazuhisa Kashiwaya
(), Civil Engineering Research Institute for Cold Region, Public Works Research Institute, kashiwaya-k22aa@ceri.go.jp;
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Atsushi Tanise
(), Civil Engineering Research Institute for Cold Region, Public Works Research Institute, tanise-a22aa@ceri.go.jp;
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Ryuichi Shinmme
(), Civil Engineering Research Institute for Cold Region, Public Works Research Institute, shimme-r22aa@ceri.go.jp;
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