Published by Paul Ivinskas
Monday, October 26, 2026

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Wildlife & plants · Fish

Bonneville cisco

One of four fish found nowhere else in the world, all in Bear Lake.

Bear Lake is home to four fish species found nowhere else in the world: the Bonneville whitefish, the Bear Lake whitefish, the Bonneville cisco and the Bear Lake sculpin, according to Utah DWR. The agency defines endemic as native to a specific geographic area and not found anywhere else worldwide. DWR calls all four crucial to the lake's ecosystem and its appeal to serious anglers.

The cisco's life cycle is part of the winter story. DWR describes its spawning season ending in late January, and whitefish feed on cisco eggs around then, in deeper water near weed beds or rock piles. That is a detail from an angler-oriented DWR article, not a rule or a fishing tip, and the same article's catch limits should not be taken as current.

Endemic describes where a species lives. It does not mean threatened, and it is not a federal or state listing. Check the agency's own records, with their dates, for any status. For fishing rules on Bear Lake, use the current DWR regulations instead of any species page.

How to recognize it

Identification needs an agency guide or expert; DWR illustrates the Bear Lake fishes.

Conservation

Endemic to Bear Lake, which describes range, not legal status; use dated agency records for status.

Watching and staying safe

Check current Utah fishing regulations before fishing; regulations change.

Places the sources name

Examples from the sources, not a complete range or a sighting guide.

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