Biology of the White Sucker (Catostomus commersoni)

Suckers are a family of freshwater fishes (the Catostomidae) that includes about 65 species worldwide, with most of these in North America. They’re all fairly robust or stout fishes, with species ranging in size from small (about 15 cm) to large (up to 45 cm) in length. Nearly all species in the family have the characteristic downward-pointing “sucker” mouth.

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