| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
Ryukyu-ayu Plecoglossus altivelis ryukyuensis is concerned about the decline in the population as well as downsizing. In Yakugachi River which is of a major habitat for Ryukyu-ayu, productivity of current water was higher in upper reaches than in middle reaches. Consequently, attatched algae in the water of upper reaches grows faster than algae in the water from middle reach. Small adult size of the recent Ryukyu-ayu is explicable by the lower productivity in the middle reaches.
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