| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
In Hirose River, major part of masu salmon Oncorhynchus masou showed seaward migration in under yearling fall, which is 6 months earlier than the migrants inhabit in other rivers. Also, such under yearling migrants undertake half year migration in coastal area and show upstream migration in yearling spring. In order to reveal the mechanism modulating such migratory pattern, we investigated the effects of water temperature changes on swimming behavior of under yearling steelhead trout. As a result, we found that steelhead juveniles avoid high water temperature zone. Hence, it appears that increase of water temperature influences habitat choice and migratory patterns. We also found that under yearling Chinook salmon which stayed in upper and lower column of an aquarium showed downstream migratory behavior during under yearling fall and yearling spring, respectively. Such phenomenon implied that we can enhance migration during under yearling stage by modulating rearing conditions.
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