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D. ALTERNATIVE 2 This alternative would allow stocking of largemouth bass. bluegill, black crappie. triploid grass carp, and mosquitofish in isolated ponds above the 50-year floodplain of critical habitat in ponds that are bermed to FEMA standards five feet above the OHWL and in connected waters that are adequately screened. Largemouth bass. bluegill, black crappie, channel catfish, triploid grass carp, mosquitofish, and fathead minnows could be routinely stocked in isolated ponds and reservoirs upstream of critical habitat if bermed to FEMA standards five feet above the OHWL. The following fish species would be prohibited from being stocked in any waters in the basin: northern pike. tiger muskie, common carp, red shiner, black bullhead, wiper. green sun-fish. yellow perch, walleye. and white crappie. Prior to implementing the routine stocking, the Recovery Program would conduct a peer reviewed study to evaluate the effectiveness of the ISMP to detect changes in the survivability and/or abundance of routinely stocked fish. Unless the study conclusively demonstrated that the ISMP is effective for tracking nonnative fishes, a program would have to be implemented to do so. If it is determined that nonnative fish escapement is occurring or that the survivability and abundance of a nonnative species is increasing in occupied habitat, then routine stocking of that species would be discontinued. Subsequent stockings of that species would then require case-by-case review until the problem is addressed. Instances when and where nonnative fishes can be stocked on a routine basis (not requiring a case-by-case review) are presented in Table 2. Stocking of nonnative fishes that are not managed or not prohibited in the Upper Basin at the present time or are not included under routine stocking would require evaluation on a case-by-case basis to ensure that the proposed stocking of these fishes will not adversely affect the endangered fishes. 11