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The fishes of North Americaâs inland waters, the most diverse of any temperate region, currently face an unprecedented conservation crisis. About 40% are imperiled or presumed extinct, and the portion of imperiled fishes is increasing. Threats to this fauna include habitat destruction, introduced species, altered hydrology, pollution, disease, over-exploitation, and other factors. Extinctions and imperilment of fishes occur among diverse taxonomic groups, across regions, and in a variety of habitats.
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