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Diet composition of norther pike was comprised of 5% juvenile Colorado squawfish, 72% other <br />cyprinids (shiners, carp, etc.), 6% suckers, 6% crayfish and 11% mice. A seasonal shift was <br />observed in the diets. Cyprinids declined in the diet of northern pike during the autumn while <br />suckers increased. <br />Bioenergetics modeling suggests that if Colorado squawfish represent 5% of the diet composition <br />of 1,000 northern pike, 188 kg of squawfish per year could be consumed. Numerically, the <br />highest losses are predicted to be 59,097-1 g squawfish during the spring and 21,885-2.8 g fish <br />during the summer. The only observed squawfish in pike diets were 1-yr old fish. If 1-yr old <br />squawfish comprised 25% of pike diets, 1,121 kg or~650,000 squawfish could be consumed. <br />These numbers should be decreased by 10, however, since our data suggest that the population of <br />pike in the Ouray section of the Green River is closer to 100 individuals. <br />ix <br />