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2. -- Establish or document the existence of ZO stable populations of pure (Type A) greenback cutthroat trout within the subspecies' historic range. In order to meet the recovery goal for delisting the subspecies, the existence of 20 stable populations of pure (Type A) greenback populations, representing a minimum of 50 hectares of lakes and ponds and 50 kilometers of stream habitat which has a minimum biomass of 20_km/ha, will need to be established or documented within the subspecies historic range. A minimum of five populations will be in the Arkansas River drainage. This Task has largely been completed, with 19 stable populations documented, representing 46.0 hectares of lake habitat and 51.6 kilometers of stream habitat, Table 4. However, only two stable populations currently exist within the Arkansas River drainage. Thus, the major task that needs to be accomplished under this revision of the Greenback Cutthroat Trout Recovery Plan is the documentation of at least five stable reproducing populations within the Arkansas River drainage (see Tables 3 and 4). 2.1 Conduct aurvevs for historic novulations. Continue to search systematically for historic populations of greenback cutthroat trout that may still exist within its historic range. Verify such populations by field collections and analysis by qualified taxonomists. 2.2 Prepare and maintain a list of candidate habitats. Prepare and maintain a list of candidate aquatic habitats that delineates areas that could, with or without modification, support populations of pure (Type A) South Platte and Arkansas River greenback cutthroat trout. A list of candidate habitats has been developed (see Tables 6 and 7). These tables will need to be updated as new habitat areas are identified. The selection of candidate aquatic habitats is based upon the following criteria: 1. Presence of barriers. 2. Ease of removing non-native fish. 23 0 1 ~7 1