クメ　マナブ   Manabu Kume   久米　学    所属   石巻専修大学  理工学部    職種   准教授
言語種別	英語
発行・発表の年月	2022/12/27
形態種別	研究論文（学術雑誌）
査読	査読あり
標題	Water temperature and precipitation stimulate small-sized Japanese eels to climb a low-height vertical weir
執筆形態	未選択
掲載誌名	PLOS ONE
出版社・発行元	Public Library of Science (PLoS)
巻・号・頁	17(12),pp.e0279617-e0279617
担当区分	筆頭著者,責任著者
著者・共著者	Manabu Kume,Yudai Yoshikawa,Tomoichiro Tanaka,Shun Watanabe,Hiromichi Mitamura,Yoh Yamashita
概要	Although river-crossing structures can have a detrimental effect on the movement and distribution of anguillid eels (genus Anguilla), they have inhabited locations upstream of river-crossing structures in many rivers. However, the growth stage in which the eels start to climb river-crossing structures remains unclear. In this study, we directly observed, using infrared video camera systems, that the Japanese eel (Anguilla japonica) climbs a low-height vertical weir as a migratory barrier, confirming the ability of eels to climb over a low-height weir within a river. All eels climbed the weir at night, between sunset and sunrise. We observed that the total length of Japanese eels that climbed the weir ranged from 60 to 140 mm, suggesting that eels inhabiting the upstream area of a weir climbed it when they were small and then lived and grew upstream. Moreover, the general additive model showed considerable effects of water temperature and precipitation on eel climbing, suggesting that water temperature and precipitation are important for its activation. The results of this study also show the effectiveness of infrared video cameras in monitoring eel climbing, which could be applied to monitor fish migratory behavior through fish passages. The findings of this study are useful for the comprehensive management and conservation of wild eel stocks.
PermalinkURL	https://dx.plos.org/10.1371/journal.pone.0279617