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1144. Compile and maintain a catalogue of all water- related projects in the Colorado River drainage basin. An up-to-date catalogue of all proposed, approved, implemented, and cc~leted projects on the Colorado River and its tributaries will be maintained. This project is indispensable to the habitat monitoring effort. 115. Identify habitat essential for the survival of the squawfish. 12. Prevent decline of resent ulations of Colorado wfish P ~P because of direct destruction of fish. Existing populations must be maintained or enhanced where , possible. It is necessary to monitor reproductive success, enforce regulations prohibiting take, and prepare habitat management plans. 121. Determine reasons for the decline of the Colorado ' ish. The historical and recent causes for the reductions in numbers and range will be docLmtiented. Although some , answers are lacking, the decline is fairly well docu- mented and understood. This information is available in published and unpublished reports. , 122. Identify and monitor existing populations. The reproductive success and relative abundance of e Colorado squawfish will be monitored annually until the species is delisted. 1221. Establish monitoring procedures. , Trend zones in the Colorado River drainage will be established where Colorado squawfish are known to exist. Trend zone selection will be based on ttnA~ criteria; first, the presence of Colorado squaw fish within recent years, and second, the ac~ssi- bility of the area to a field crew. Float trips through such trend zones (16 to 24 km) will be conducted annually. Areas in Colorado are: 1) the Gunnison River fran F]hitewater, Colorado, da~,mstream to Grand Junction, Colorado; 2) the Colorado River from the confluence of Plateau Creek downstream to Clifton, Colorado; 3) the Yampa River fran the confluence of the Little Snake River downstream to Deerlodge Park in Dinosaur National N~nument; and 4) the Yampa 16