The Sacramento sucker (Catostomus occidentalis) is a species of ray-finned fish in the family Catostomidae. It is primarily found in California with some populations extending into Oregon and Nevada. They inhabit a diverse range of habitats from headwater streams to deep lakes to estuaries. The Sacramento sucker scientific name Catostomus occidentalis describes its morphology and origin, respectively, being an inferiorly mouthed (Catostomus) western (occidentalis) species; the name Western sucker has also been used.

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