短報
天竜川水系中田切川におけるイワナの増殖に対する養殖稚魚の放流効果
2018 年 66 巻 1 号 p. 85-87
詳細
2018 年 66 巻 1 号 p. 85-87
A total of 800 hatchery-reared white-spotted charr Salvelinus leucomaenis fry (underyearlings) were stocked into a study site in the Nakatagiri River, central Japan, during autumn of every study year from 2011 to 2015 and 22 stocked charr were recaptured from 2013 to 2016. Of the recaptured charr, 20 charr (90.9%) were age 1+, 2 charr (9.1%) were age 2+, and no > age 3+ charr was recaptured. The results suggest low effectiveness of fry stocking to enhance the > age 2+ charr population.
