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Bridgelip suckers (Catostomus columbianus) are a species sucker fish (family Catostomidae) that inhabit the Columbia River system. All the species of sucker fish live in fresh water. Bridgelip suckers tend to dwell in deeper waters during the day and move into shallower water at night. As adults they eat periphyton (algae and microbes found on submerged substrata). Juveniles, however, eat aquatic insect larvae and zooplankton. Adult bridgelip sucker range in size from 5 inches to 17 inches. They spawn around May, when the water temperature is between 8-13 C, and lay between 9,955 and 21,040 eggs. Within the Columbia River system, the bridgelip sucker shares much of its habitat with another similar looking sucker, the largescale sucker.

References

http://www.fs.fed.us/r6/centraloregon/water-fish/species/fish-nongame.shtml
Article by Dauble, D., D. in Transactions of the American Fisheries Society