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~ ~ Proposals to introduce a nonnative fish species identified in Table 2 will also thoroughly address each of the elements of case-by-case proposals described in Part II, B, of these Procedures. Ill. INTRODUCTION OF NONNATIVE AQUATIC SPECIES NEW TO THE UPPER BASIN. The Service and the States recognize that introducing new species into an ecosystem can produce unanticipated impacts to native species. Because of the potential impacts of new introductions, few proposals to introduce new species or hybrids into the Upper Basin are anticipated. In the event that such a proposal is submitted, it would need to be ecologically justified and evaluated with respect to impacts to threatened or endangered species and recovery efforts for these species. The justification and evaluation will be consistent with Section 5, elements a-g, of the American Fisheries Society Position Statement on the Introduction of Aquatic Species, as described above. Proposals to introduce new nonnative fish species into the Upper Basin will also thoroughly address each of the elements of case-by-case proposals described in Part II, B, of these Procedures. IV. LOCATIONS AND SITUATIONS WHERE STOCKING WOULD BE UNACCEPTABLE. There shall be no stocking of nonsalmonid, nonnative species in riverine habitat that is occupied by the endangered Colorado River fishes. Figure 1 displays occupied endangered fish habitat in the Upper Basin. V. REVIEW PROCEDURES Figure 1 summarizes the process for reviewing stocking proposal developed under Part II or Part III of the Procedures. The proponent of a stocking proposal may elect to withdraw or modify a proposal at any time in response to identified concerns. , At such time a proposal is approved or withdrawn, the States, Service, Recovery Program Participants and other interested parties will be so notified. Steo 1. Formal Stockina Prooosal. The review process is inttiated with a formal stocking proposal developed in accordance with the guidelines outlined in Part 11 or III of the Procedures. Proposals to stock nonnative fishes will be founded on sound biological evaluations and contain sufficient information to allow for an objective and complete evaluation. Steo 2. Public and Aaencv Review. Stocking proposals will be submitted to the Service, the States, participants in the Recovery Program and other interested parties for review and comment for a 60 day period. It is recognized that review by the Service and the States will be based on sound biological principles that shall be specifically identified. Furthermore, if the Service or State agency objects to a stocking proposal, that agency will make a concerted effort to identify reasonable alternatives. As part of its review, the Service will assess 10