Recent estimates put the number of known freshwater fish species at about 9000. Of these, an astonishing 20% are extinct or endangered.
About 13,000. According to FishBase.org, a global information system about fish species and diversity, there are currently 31,300 known species of fish in the world. And according to 2005 research, 41% of all fish dwell in freshwater habitats. So it’s difficult to come up with an exact answer, but it’s probably around 13,000.
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