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. 36 . a readily available food source for both young-of-the-year and juvenile squawfish and it appears very likely that an abundance of these preferred habitats may well increase the survival potential of young squawfish, primarily from the standpoint of food availability. If this hypothesis is correct, preferred habitat of young may, in fact, be a limiting factor to rare fishes, especially Colorado squawfish. The low water levels encountered during the study reduced the available number of small backwaters from normal levels. A large number of potential backwater situations were seen in the study area that, given 1-2 feet of additional flow, would have been preferred young squawfish habitat. The cross-sectional data of Figures 12 and 13 indicate that that particular area had certain depth and velocity categories present. Very little preferred habitat (Figure 2) of young-of-the-year squawfish was present, except in the backwater where they were found. Cross-sec- tional data from other areas of young-of-the-year squawfish habitat would provide comparative data; unfortunately the study plan did not provide for additional measurements. . . . . . . Rare Fish Movements and Potential Spawning Areas . The three young-of-the-year squawfish recaptured in the sample backwater provide little data on movement. The fact that a relatively large number of fish were marked and that successive samples found re- latively large numbers of unmarked fish, indicates several possibilities. First, a fairly large population is indicated. Secondly, failure to re- capture marked fish suggests either low sampling efficiency or absence of . .