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T ~~ <br />We explored the bounds of this uncertainty in pike diet composition with additional model runs <br />to simulate different proportions of juvenile squawfish in the diet. All ages of northern pike <br />were assumed to consume Colorado squawfish as a constant proportion of their diet throughout <br />the year. These results were then compared with those of the nominal simulation which used <br />age-specific diet composition obtained from field data. Predicted consumption from the nominal <br />run was bracketed by simulations where juvenile squawfish represented a constant 3% (134 kg <br />of squawfish eaten) or 5% (224 kg eaten; Figure 4). As an upper limit, we simulated Colorado <br />squawfish consumption as 25 % of the northern pike diet. This "worst case" scenario would <br />result in the depredation of 1,121 kg of Colorado squawfish. If predation was confined <br />exclusively to single age classes of squawfish, the depredated biomass translated into numerical <br />losses of 650,000 age-1, 137,000 age-2, or 26,000 age-3 Colorado squawfish. <br />