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' ~ ~ f w ~2 Of the native fishes, the two suckers are still common. Lack of known records for the razorback sucker (Xyrauchen texanus) is perhaps explainable on the basis of absence of suitable habitat, for this fish must have moved through this part of the Colorado River since it occurs both in the upper and lower parts of the basin. The minnows are represented by me~abers of the Gila robnata complex (which includes G. elegans and G. cypha) but we did not find specimens in our preserved collections that could be assigned without question to either of those species. We did catch and release, at RM b1~.5 (about 2 miles below the mouth of the Little Colorado River}, a fish about 6 inches in total length which may have been a humpback chub. This species has been collect- ed in the area covered by our survey on a number of occasions in recent years, as folloxs: Lees Ferry (1, 1963; 1 1971); Vasey's Paradise (1, 1968); near Little Colorado River (!~, 1970-confiscated by Arizona Game and Fish Dept.); mouth of Colorado River (1?, 1968); 3 miles below Little Colorado River (3, 1968); and mouth of Bright Angel Creek (l, holotype, prior to 19I~2). This species is also known (an incomplete skull) from Stanton~s Cave near Qasey~a Paradise. The Colorado squawfish has been reliably reported from the Little Colorado River near the base of Black Falls many years ago, but the only recent (post 1920) "record" of which I am aware is a specimen said to have been caught at the mouth of Havasu Creek in June, 1973, by an unknown fisherman, as reported to i~l. L. Hinckley (who has the specimen, about 320 mm in standard length, ezamineci by me on 25 July 1975) by Arizona Game and Fish Department. The very cold water (!~7°F to 60°F ), of the Colorado between Lees Ferry and Spencer Creek certainly precluded (this year) spawning of native species in the main river. The best spawning sites are thus the warmer tributaries, especial- L/ ly the lower. part of the Little Colorado River.