| Budget Amount *help |
¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2016: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
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| Outline of Final Research Achievements |
In the Sanriku coastal area, Japan, early-run chum salmon experience high water temperatures during their migration, compared with those of the late-run fish, suggesting that the two populations might have different thermal performance. Thermal performance characteristics of chum salmon that return to the Kitakami River in autumn and the Kasshi River in winter were examined by measuring metabolic rates. The aerobic scope of the Kitakami population peaked at a temperature that was 3°C higher than that of the Kasshi fish. A mathematical model suggests that the Kitakami population can run up rapids and metabolic characteristics such as low energy consumption even at high water temperatures. Also, the fish attached with data-loggers released in the Kitakami River performed efficient run-up by swimming with rest at high stream velocity. These results suggest the Kitakami fish population adjusts their metabolism to enable them to swim upstream with long-distance in the warmer conditions.
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