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Exotic from Africa and coastal rivers of Israel. At least four varieties of tilapia have been introduced into Arizona since the 1960’s. Extensive hybridization often makes identification difficult.
Original range of the rainbow trout was from Northern Mexico to the Kuskokwim River, Alaska. Some stocks existed in the Great Basin and in British Columbia, but none was native to any part of the Colorado River.
Non-native, originally found in Canada and northern states around the Great Lakes. Introduced to Arizona in 1965. Back and sides are dusky olive-green with rows of light oval spots.
Native to the St. Lawrence and Great Lakes, Hudson bay and the Mississippi River basin. ond rear margin of eye.
Channel catfish have few spots on the large adults. Smooth, scaleless skin. Four pair of barbels or ‘whiskers.’ Short base on small adipose fin. Deeply forked tail. Anal fin has 24 to 30 rays and is slightly rounded.
Exotic from Europe. Introduced in Arizona in 1931. Olive-brown with yellowish brown sides. Some orange or red spots on the sides, black spots often encircled with light yellow or white, dark spots on back and sides.