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r Nongame nonnative fishes with established riverine populations would continue to be another problem. 2. Recreation: Recreational opportunities in Utah and Wyoming would be unaffected by this alternative, except that new private ponds to be stocked would have to be outside the 50-year floodplain or bermed to above the 50-year floodplain. In Colorado, future private ponds below the 50-year floodplain wishing to have fishing but not wanting to berm to above the 50-year floodplain would have to purchase trout rather than warmwater fishes from the aquaculture industry. Ponds would probably not be suitable for trout during summer months. Fishing in private ponds would be concentrated during spring and fall months. Private ponds below the 50-year floodplain that currently have warmwater fishing would retain it, unless they voluntarily allowed their pond to be reclaimed. If their warmwater fishery collapsed for some reason, the pond could only be restocked with trout. Localized losses in warmwater fishing opportunities might occur, especially during summer months. However, approval of management plans for Jerry Creek Reservoir and Juniata Reservoir will increase warmwater fishing opportunities above current levels. Additionally, the screening of Highline and Elkhead Reservoirs will provide additional future recreational fishing opportunities. 3. Recovery of Endangered Fishes: The few ponds that might be bermed to FEMA standards would reduce and isolate the amount of floodplain habitat available to the endangered fishes during high flow events. Nutrients and plankton in these floodplain habitats will be isolated from the river. However, because so few ponds might be bermed, there would be little negative impact. Ponds bermed to FEMA standards may also have positive benefits including: 1) preclude re-invasion of the river by nonnative sport fish stocked into that pond, 2) would not trap endangered fishes during high flow events, and 3) preserve warmwater angling opportunities in some ponds. Flows greater than a 50-year ~, event will still allow nonnative fishes to escape to the river, but few ponds exist at this elevation. 4. Economy: Costs of berming ponds to FEMA standards have been estimated to be about X36/linear foot (CDOW estimate for Corn Lake). It is likely that stocking of private ponds with warmwater species would decrease causing impacts to the warmwater fish brokers in the aquaculture industry. This may be partially offset by increased trout purchases by the private sector. The change in overall fishing days in Colorado would be minimal. This alternative may reduce fishing expenditures by some unknown amount. Warmwater anglers generally spend about s40/day, although it is probably much less on privately owned ponds. C. Alternative 1. 1. Aquatic Biological Resources: The case by case review process would help to insure that no fish species known to adversely effect the endangered fishes would be stocked in areas or situations where they 32 1