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population of whitefish in the White and Yampa river drainages. It is a logical assumption that the whitefish population has been and will be largely controlled by physical and biological limitation of the habitat. These natural controls will likely determine any significant population changes, and normal hook'and line fishing is not expected to influence the popula- tion to a detrimental degree. It is recommended that the daily bag and possession limit on whitefish be relaxed to 10 fish on the White River drainage, thus corresponding to the regulations on the Yampa. Year around fishing for whitefish on both drainages is also recommended. 204. Kobetich, G. C., and P. B. Holden. 1976. ENDANG. FISH Endangered and threatened fishes of the HISTORY Colorado River basin. Proceedings Western HABITAT ALT.. Association State Game and Fish Commissioners COLORADO R. 56:286-287. (Abstr.) The Colorado River basin has a long history of isolation from other drainage areas and was once divided geologically into two distinct basins. In each basin a separate group of fish evolved. When the basins joined the fish fauna mixed and formed the Colorado River basin fish fauna as we now know it. During the Pleistocene additional drainage areas became conjoined with the Colorado River system and were invaded by the Colorado River fish fauna. As the Pleistocene closed these connectives desicated and lost their connections with the main system. The fish fauna remained, however. Because of the history of isolation of the Colorado-River basin and its Pleistocene connectives the fish fauna is highly endemic and depauperate and, therefore, subject to competitive displacement by exotic fish species from larger drainage areas with a more saturated fauna. The effect of exotic fish introductions combined with gross changes in the habitat have had a devas- tating effect on the Colorado River basin fish fauna. Today, many of these fish are endangered and threatened. Efforts are being made to prevent the extirpation of the remaining popula- tions. QF