Freshwater fish are the most endangered group of animals on the planet, with more than a third threatened with extinction, according to a report being compiled by British scientists.
Among those at the greatest risk of dying out are several species from UK rivers and lakes including the European eel, Shetland charr and many little known fish that have become isolated in remote waterways in Wales and Scotland.
Others critically endangered include types of sturgeon, which provide some of the world's most expensive caviar, and giant river dwellers such as the Mekong giant catfish and freshwater stingray, which can grow as long as 15 feet.
The scientists have blamed human activities such as overfishing, pollution and construction for pushing so many species to the brink of extinction.
http://www.telegraph.co.uk/earth/wildlife/8672417/Third-of-freshwater-fish-threatened-with-extinction.html