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As such ,the Mainstem Green River Action Plan contains a task to identify options to release warmer water and restore native fish habitat in this reach. A number of potentially harmful contaminants (including selenium, petroleum derivatives, heavy metals, and uranium) and suspected contaminant "hot spots" have been identified in the upper basin. It is the intent of the Recovery Program to support and encourage the activities of entities outside the Recovery Program that are working to identify problem sites, evaluate contaminant impacts, and reduce or eliminate those impacts. 2.3 III REDUCE NEGATIVE IMPACTS OF NONNATIVE FISHES AND SPORTFISH MANAGEMENT ACTIVITIES Fifty-two fish species occur in the upper basin, but only 13 of those are native species. Many of the nonnative fishes have been successful due to changes in the river system that favor their survival over that of native fishes. Competition with and predation from nonnative species (not including salmonids) is widely assumed to have played a role in the decline of the endangered fishes (Bestgen 1990). However, evidence of direct impacts of introduced species on native fishes is difficult to obtain (Schoenherr 1981) and often is masked by man-caused habitat alterations (Moyle 1976). Recovery Program activities related to nonnative fishes to date have focused primarily on identifying impacts/interactions and developing nonnative fish stocking procedures. The Recovery Action Plans include a variety of tasks to assess impacts of nonnative fishes where those impacts are still relatively unknown, to identify potential conflicts between reservoir fisheries management and develop alternative management plans, to assess options to prevent nonnative fish escapement from reservoirs, and to assess sportfishing regulations and angling mortality on native fishes. Depending on the results of these evaluative tasks, actions may then be taken to reduce or eliminate impacts of the nonnative fishes. The states and the Service also are developing procedures for stocking nonnative fishes in the upper basin which also will be reviewed and approved under the Recovery Program. The procedures are designed to reduce the impact of stocking of nonnative fishes on native fishes in the upper basin and clarify the role of the states, the' Service, and others, in the review of stocking proposals. It is intended that all participants in the Recovery Program will abide by and support these procedures. 2.4 IV. CONSERVE GENETIC INTEGRITY AND AUGMENT OR RESTORE POPULATIONS Species recovery depends on protecting and managing species genetic resources. This is a very complex activity that includes: determining the genetic stocks of the endangered fishes; protecting those stocks in refugia; planning, developing, and 9