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Table 2. Alternative 2 locations/situations where nonnative fish species can be stocked on a routine basis. A. Locations/situations where nonnative fish species can be stocked on a routine basis: All waters of the Upper Basin: salmonids (trout). 2. Isolated ponds/reservoirs that are within the 50-year floodplain of river reaches upstream from critical habitat and that are bermed to FEMA specifications five feet above the OHWL: largemouth bass, black crappie, bluegill. channel catfish, fathead minnow. mosquito fish, triploid grass carp'. 3. Lake Powell: striped bass, threadfin shad. 4. Any waters above Flaming Gorge: channel catfish, mosquitofish, redside shiner, smallmouth bass. 5. Strawberry Reservoir: smallmouth bass. 6. Routine stocking of largemouth bass, black crappie, bluegill in: a. Isolated ponds/reservoirs that are located above the 50-year floodplain for river reaches designated as critical habitat and that are bermed to FEMA specifications five feet above the OHWL. b. Connected (to river reaches designated as critical habitat) ponds/reservoirs with facilities or operations that will prevent escapement of all but the eggs and larvae of these routinely stocked nonnative fishes. E. ALTERNATIVE 3 This alternative would confine stocking of fish except trout to above the 100-year floodplain in river reaches that are designated as critical habitat, would not condone the use of artificial dikes to remove ponds from the 100-year floodplain of critical habitat, and would not allow stocking (except trout) in connected waters regardless of proposed screening measures. 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 sunfish, 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 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. Triploid grass carp include only those that have a certificate of genetic triploidy. 12