 While the sucker is relatively tolerant of poor water quality, compared to other fish, there is a history of multiple sucker die-offs.Introduced fish species in the area include brown bullhead, fathead minnow, yellow perch, Sacramento perch, pumpkinseed, bluegill, green sunfish, largemouth bass, and brown trout.A number of these species readily feed upon juvenile suckers, especially the fathead minnow and yellow perch.