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the Mathcad modeling software, we rewrote the original model using the Quattro Pro <br />(Version 7 for Windows 95 using PC computers) platform. The mathematical formulas <br />and logical flow were programmed exactly as in the original model. Input parameters <br />are entered from the `A' folder of the model by changing the properties associated with <br />the 'run' button. For a further description of the model mechanics, see Appendix 2. <br />MODEL CALIBRATION <br />The model was calibrated to existing estimates of Colorado squawfish abundance. The <br />only estimates were for adult Colorado squawfish abundance and were generated from <br />mark-recapture estimates in the Colorado River arm of the upper Colorado River Basin <br />(Osmundson and Burnham 1996). Estimates of abundances for the entire basin are <br />more applicable for our purposes and though data exists for mark-recapture estimate <br />for the whole basin, these estimates had not been made to date. Therefore, we <br />incorporated athree-step process to calibrate the model. First, we used Osmundson <br />and Bumham (1996) Colorado River data base to determine if we could adequately <br />model those observed dynamics. Second, we used the tagging data base and, using <br />mark-recapture models, estimated the total adult squawfish population for the entire <br />upper basin. Finally, given the adult population estimated for the Colorado River <br />subpopulation, we recalculated the Upper Basin estimate for an upper subpopulation <br />(those fish that spawn in the Yampa) and a lower Green River subpopulation (near <br />12 <br />