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Bony Lai i Chub The author has not taken any Bonytail chub recently in Colorado or Utah. The most intensive, recent study was by Holdon(1975) and he found them to be very rare where they were taken. These fish were found in the Green River- Yampa River confluence area. Walter Walker Wildlife area has had an excellent population of Razor- back suckers and Colorado squawfish at all times since it was first investi- gated in 1973. This is the only known location on the Colorado River where a fair population of both fish persist in comparatively significant numbers. Other sites along the river periodically have concentrations of one species of fish. Rarely do both species occur in equal numbers. All areas this author has studied which have significant numbers of either or both these fish species have one common physical feature--a relatively large backwater area well connected to the river; at all stages these fish are found in them. In 1976 these fish did not return to many of the backwater areas where major concentrations were recorded in 1975. N.F.R.I. believes low water conditions prevailing in 1976 restricted these fish from utilizing these backwaters they readily occupied in higher water years. Intensive netting effort failed to yield any razorbacks or squawfish, with one exception: Walker Wildlife Area. Reasons for this are not quite clear. However, as stated above, low water conditions affected significantly size and access to all the backwater areas except Walker Wildlife area. This is also true on the Gunnison where low, early summer flows do not enlarge the few backwater areas to a size comparable to backwater areas where fish are found in the (32)