| Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2021: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2020: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2019: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
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| Outline of Final Research Achievements |
Swimming behavior, ambient water temperature, and body temperature of large migratory fishes were measured using bio-logging techniques and analyzed in combination with metabolic rate data. Blue sharks kept their body temperature within a certain range by using thermal inertia caused by their large bodies and by constantly repeating dives. Greenland sharks in the Arctic had low metabolic rates due to their low body temperatures and were able to maintain a positive energy balance with a small amount of food. Comparisons of metabolic rates among fish species showed evidence of evolutionary modifications of temperature effects on metabolic rates in teleosts (bony fishes), but not in elasmobranchs (sharks and rays). It is possible that elasmobranchs may be more sensitive than teleosts to changes in water temperature associated with climate change, leading to larger changes in their distributions.
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