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taken to recover the endangered fishes. The study period of analysis chosen to reflect the recovery projections for the endangered fishes was 1989 through 2020. Economic activity under the without fish scenario was estimated using Impact Analysis for Planning (IMPLAN) 1982 data sets updated and projected through the year 2020 using data from the Bureau of Economic Analysis of the U.S. Department of Commerce. These economic projections formed the without fish scenario for determining the impacts due to proposed critical habitat. 2. With Fish Scenario The with fish scenario was constructed by analyzing potential changes in economic activity that may occur due to listing and proposed critical habitat designations and/or other protection and recovery efforts for endangered fishes. These potential changes were projected for specified intervals over the entire study period. D. Aggregation of Producing Sectors The IMPLAN input-output data base that serves as a foundation for both the input-output models and the CGE model is composed of 528 producing sectors. For the analyses, this number was reduced by aggregating like sectors. Several considerations affected the level of sectoral aggregation. The type of analysis is one factor in the determination of the appropriate level of aggregation and the manner in-which the aggregation is performed. In general, it is desirable to aggregate those sectors that are not of direct interest to this study. This results in a level of detail that can be managed. Conversely, those sectors that are of interest to the task at hand must be kept separate. Thus, the aggregation scheme adopted for this analysis retains several agriculture sectors, the recreation sector, the electric power sector, -and some key mining sectors. For each stage of the input-output modeling process, 20 economic sectors, aggregated from the original 528, were modeled using the IMPLAN data sets. The 20 sectors are reported in Table I-4-1. I-18