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migrating Colorado squawfish along natural migration routes contributing to the loss of historic habitat. Less is known about the extent and range of movements of the other three species. ' Fish passageways have been used successfully for certain species in other river systems, for example, the northern squawfish. However, it is not known whether the Colorado squawfish will use passage facilities, since none has 1 1 1 been tested in the upper basin. Successful passageways could provide a means for reestablishing squawfish in parts of their former historic range. For example, installation of passageways could make available 40 miles of historic habitat above the Redlands diversion on the Gunnison River, 15 miles of habitat on the Colorado River upstream from Palisades, or 50 miles of habitat above the Taylor Draw Dam on the White River. Below the recently completed Taylor Draw Dam, Colorado squawfish still congregate in their natural attempt to migrate upstream. Natural migrations no longer occur at other older structures. If passage facilities prove effective for the squawfish, installations at Taylor Draw or other dams may be warranted (see Section 4.3.4). Chances of success may be increased by introducing hatchery-reared rare fishes above or below passage facilities or building facilities at dams where the rare fish are staging for natural migration. However, reservoirs also provide habitat for many nonnative species. Interrelationships between the rare and nonnative species must be closely examined (see Section 4.4) to determine the impact from fish passage development. No passage facility has been constructed in the Upper Colorado River Basin. However, the Service has some funding available through Section 7 and has conducted a feasibility study on a prototype fish passage facility at the ' Redlands Water and Power Company diversion dam on the Gunnison River. 4.2.5 Selected Course of Action a. The Service and States will perform research as identified in the Research Program (Appendix 6'.2) to determine if and how development and maintenance of habitat for the rare fish species (backwaters, jetties, grow-out ponds (see Section 4.3.2), fish passages, and spawning habitat) will contribute to the recovery of the rare Colorado River fishes. These studies will include testing the management options described in this section to determine their usefulness to recruitment and their contribution to lied recover The followin sti ulations will be a . y. g pp p 1. Testing and implementation of management techniques will not be conducted in confirmed spawning and nursery areas or in river reaches which, if modified, might adversely affect use of confirmed spawning or nursery areas; and 2. The genetic integrity of wild populations must be protected when using hatchery-reared experimental animals. 1 4-13