With more than 31,900 species identified to date, about 51% of all fish species are found in freshwater — that's more than 18,000 different species. And they make up a quarter of all the vertebrates in the world. Of course, those are just the species that we know of. So, out of these species, which is the fastest freshwater fish? Fish species can reach speeds we didn't expect, find out the fastest swimming fish in freshwater in the natural world.
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