自1970到2012，全球大型淡水動物如河狸、鱘魚、鮭魚、淡水豚等的數量下降了88%。牠們主要是被過度捕獵作食用、取其皮毛及卵等所威脅，建水壩及其他發展亦導致河流被分割而破壞了生態系統。

From 1970 to 2012, the number of freshwater megafauna in the world including beavers, sturgeons, salmonids, river dolphins, etc. has declined by 88%. They are mainly threatened by overexploitation because of their meat, skin and eggs; dams building and other developments are also causing fragmentation of river and destroying the ecosystems.

https://www.natureworldnews.com/articles/41902/20190809/88-percent-decline-of-big-freshwater-animals.htm