サケの遡上、初のゼロに 埼玉・行田の利根大堰 気候変動影響か 最多は2013年の1万8千匹超も近年は急激に減少
https://news.yahoo.co.jp/articles/9b9d85a94f286a4621d7abd5e93086a1dc5fa1b3?source=sns&dv=sp&mid=other&date=20250113&ctg=loc&bt=tw_up
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