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" 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. 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 st?ctors 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 (Table 5). This aggregation permits investigation of changes in the economic activity of the sectors in the study due to designation of critical habitat. For the CGE model, sectors 19 and 20 in Table 5 were combined into a single sector. Estimating the economic impacts of the proposed critical habitat designations for endangered fishes poses formidable challenges because many impacts will result, not from current activities but, from future activities set in motion by Section 7 Consultations. 22