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\ . be partly true, but I doubt that it is the entire answer. Immature 20 fish also appear to migrate. Moreover, there is evidence, largely obtained from talking to local people, that some squawfish remain throughout the winter in the deeper pools. This possibility I plan to check on the next trip. If one can be captured in the Upper Lily Park site during November, it vrill,lend support to this hypothesis. Whatever the cause of tl~e migration into the Yampa in early summer, it is obvious that they cannot remain in large nurnbers after late summer. The water supply isn't there to support a large population. Being pisciverous only compounds the situation for the squawfish. The pools that remain when the water subsides can continue to provide habitat. It may be that the increased flow of late spring and early summer provides increased habitat for fish in general. Prey fish such as the bonytail may have previously migrated in large numbers at this time to be fo llowed by squawfish. This is still speculation but it is the direction in which my thinking is now directed. Thus I would believe that habitat and forage are more significant stimulators of the. migration than temperature, turbidity or spawning. There are some problems with this. For one thing, no squawfish vrere captured around Echo Park in Play even though the water was high and considerable effort was made. In addition, to the two maps mentioned above, I have attached a drawing of 2 sites (Figure 4), found by George Kidd of the Colorado Division of Wildlife where native fish were easy to catch. Walter Walker is similarly a backwater area where fair numbers of native fish can still be found. Thus it would seem that the evidence indicates .that adult squaw- fish are most readily found in eddies, backwaters and deep pools. These