Conservation method for endangered Amami-ryukyu Ayu, Plecoglossus altivelis ryukyuensis

2016 Fiscal Year Final Research Report

• Project/Area Number: 26550099
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Design and evaluation of sustainable and environmental conscious system
• Research Institution: Nagasaki University
• Principal Investigator: IGUCHI Keiichiro 長崎大学, 水産・環境科学総合研究科(環境), 教授 (00371865)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 希少魚 / 栄養塩類 / 社会実装 / 主流化

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.

Free Research Field

保全生態学