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• Contamination of the Gunnison River with selenium and mercury is a conservation concern for the bonytail chub, Colorado pikeminnow, humpback chub, and razorback sucker, whose critical habitat includes the lower Gunnison River.
• The Yampa's warm, silty waters are an ideal spawning ground for native fish such as the Colorado pikeminnow and humpback chub which have largely disappeared from dammed waterways in other parts of the Colorado River system.
• Today, the Spokane River supports populations of rainbow trout, northern pikeminnow, and Bridgelip Suckers (Catostomus columbianus), as well as several non-native species.
• Redband trout, rainbow trout are residualzied from anadromous steelhead, while suckerfish migrated from Spokane River, pikeminnow, longnose dace, speckled dace, sculpin and native mountain whitefish are indigenous.
• Other fish species include round whitefish, largescale sucker, bridgelip sucker, northern pikeminnow, longnose dace, and slimy sculpin.
• Species known to occur currently include Pacific lamprey (Lampetra tridentata), steelhead/resident rainbow trout (Oncorhynchus mykiss), chinook salmon (Oncorhynchus tshawytscha), California roach, Hitch (Lavinia exilicauda), Sacramento blackfish (Orthodon microlepidotus), Sacramento pikeminnow, Sacramento sucker, three-spined stickleback, prickly sculpin (Cottus asper), riffle sculpin (Cottus gulosus), staghorn sculpin, and tule perch (Hysterocarpus traskii).
• Fish species at Lake Berryessa include; largemouth bass (Micropterus salmoides), smallmouth bass (Micropterus dolomeiu), spotted bass, channel catfish (Ictalurus punctatus), bullhead catfish (Ictalurus dolomeiu), white catfish (Ameiurus catus), carp (Cyprinus carpio), Sacramento pikeminnow (Ptychocheilus grandis), crappie, bluegill (Lepomis macrochirus), rainbow trout (Onchorhynchus mykiss), brown and brook trout, Kokanee, and also Chinook salmon (Onchorhynchus tschawytscha).
• The Quesnel River supports a number of fish species, the most significant of which are Sockeye salmon (Oncorhynchus nerka), Rainbow trout (Oncorhynchus mykiss), Largescale sucker (Catostomus macrocheilus), Longnose sucker (Catostomus catostomus), Redside shiner (Richardsonius balteatus), Northern pikeminnow (Ptychocheilus oregonensis), Peamouth chub (Mylocheilus caurinus), and Lake chub (Couesius plumbeus).
• Current turbidity, more shallow depths and a lack of aquatic plant structures have diminished the variety of species and more recent surveys showed the most abundant fish by mass were brown bullhead, white crappie, black crappie, and common carp, with a few juvenile salmonids and a population of channel catfish, largemouth bass, bluegill, pumpkinseed, yellow perch, naturalized goldfish, northern pikeminnow, American shad, mosquito fish, largescale sucker, and freshwater sculpin.
• The four native fishes affected are the razorback sucker, Colorado pikeminnow, humpback chub, and bonytail chub.
• California's archaeological record has contributed to knowledge of the prehistoric distribution of fishes in Alameda Creek and its tributaries including Sacramento perch (Archoplites interruptus), Sacramento suckers (Catostomus occidentalis occidentalis), Tule perch (Hysterocarpus traskii), Hitches (Lavinia exilicauda), Hardheads (Mylopharodon conocephalus), Sacramento blackfish, and Sacramento pikeminnow (Ptychocheilus grandis).
• There are several native carp species including chiselmouth, longnosed dace, peamouth, speckled dace, and the predatory northern pikeminnow.
• When surveyed in 1973, Big Sulphur Creek supported snakes, salamanders, frogs, many kinds of fish (both steelhead and rainbow trout, Sacramento pikeminnow, suckers and roach), flies (trichoptera, diptera, hemiptera, plecoptera and odonata), and aquatic plants (sedges, cattails, and algae).
• Native fish species that currently inhabit, or that have historically inhabited the East Fork of the Russian River, include steelhead trout (Oncorhynchus mykiss), chinook salmon (Oncorhynchus tshawytscha), coho salmon (Oncorhynchus kisutch), rainbow trout (oncorhynchus mykiss irideus), hardhead (Mylopharodon conocephalus), Pacific lamprey (Entosphenus tridentata), Sacramento pikeminnow (Ptychocheilus grandis), Sacramento sucker (Catostomas occidentalis occidentalis) and Russian River tule perch (Hysterocarpus traskii pomo).
• Other native fish species in the Uvas Creek watershed include Sacramento sucker (Catostomus occidentalis), Sacramento pikeminnow (Ptychocheilus grandis), California roach (Lavinia symmetricus), Riffle sculpin (Cottus gulosus), Pacific lamprey (Lampetra tridentata), and Threespine stickleback (Gasterosteus aculeatus).
• According to a study from 2003 to 2004, there were 13 different species of fish in the Potlatch River watershed, including speckled dace, longnose dace, rainbow trout (both wild and farm-raised), brook trout, largemouth bass, pumpkinseed, northern pikeminnow, redside shiner, sculpin, bridgelip sucker, largescale sucker, and yellow perch.
• In a 1996 biotic assessment of Searsville Reservoir and the lower floodplain of Corte Madera Creek, Stanford biologists wrote that the native species likely included coastal rainbow trout (Oncorhynchus mykiss irideus), sculpin, California roach (Hesperoleucas symmetricus), hitch (Lavinia exilcauda), speckled dace (Rhinichthys osculus), Sacramento sucker (Catostomus occidentalis), Pacific lamprey (Entosphenus tridentatus), and perhaps three-spined stickleback (Gasterosteus aculeatus), Sacramento pikeminnow (Ptychocheilus grandis), Sacramento blackfish (Orthodon microlepidontus), and coho salmon (Oncorhynchus kisutch).
• Although the spawning of hardheads in the wild has never been observed it is thought that it is probably similar to the spawning of the closely related Lavinia exilicauda and Sacramento pikeminnow, both species which lay their fertilized eggs in sand or gravel substrates in well oxygenated water such as riffles, rills, or faster flows at upper ends of pools.
• Fish species endemic to the ecoregion include the Sacramento perch (Archoplites interruptus), Delta smelt (Hypomesus transpacificus), Sacramento splittail (Pogonichthys macrolepidotus), rough sculpin (Cottus asperrimus), tule perch (Hysterocarpus traskii), Sacramento pikeminnow (Ptychocheilus grandis), Kern brook lamprey (Lampetra hubbsi), and hardhead (Mylopharodon conocephalus).

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