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<br />nU2~;;l <br /> <br />, <br /> <br />2. Z.tabli.b or document the exi.teDce of 20 .table population. of pure <br />(Type A) greenback cutthroat trout within the .ub.pecie.' hi.toric range. <br /> <br /> <br />~ <br /> <br />In order to meet the recovery goal for delisting the subspecies, the <br />existence of 20 stable populations of pure (Type A) greenback <br />populations, representing a minimum of 50 hectares of lakes and ponds and <br />50 kilometers of stream habitat which has a minimum biomass of 20.km{ha, <br />will need to be established or documented within the subspecies historic <br />range. A minimum of five populations will be in the Arkansas River <br />drainage. <br /> <br />This Task has largsly been completed, with 19 stable populations <br />documented, representing 46.0 hectares of lake habitat and 51.6 <br />kilometers of stream habitat, Table 4. However, only two stable <br />populations currently exist within the Arkansas River drainage. <br /> <br />Thus, the major task that needs to be accomplished under this revision of <br />the Greenback Cutthroat Trout Recovery Plan is the documentation of at <br />least five stable reproducing populations within the Arkansas River <br />drainage (see Tables J and 4). <br /> <br />2.1 Conduct surveys for historic populations. Continue to search <br />systematically for historic populations of greenback cutthroat trout <br />that may atill exist within ita historic range. Verify such <br />populations by field collections and analysis by qualified <br />taxonomists. <br /> <br />2.2 Preoare and maintain a list of candidate habitats. Prepare and <br />maintain a list of candidate aquatic habitats that delineates areas <br />that could, with or without modification, support populations of <br />pure (Type A) South Platte and Arkansas River greenback cutthroat <br />trout. A list of candidate habitats has been developed (see Tables <br />6 and 7). These tables will need to be updated as new habitat areas <br />are identified. The selection of candidate aquatic habitats is <br />based upon the following criteria: <br />1. Presence of barriers. <br />2. Ease of removing non-native fish. <br /> <br />23 <br />