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<br />Figure Description Page <br />13. Length frequency distribution of fish prey species found in <br /> stomachs of Yampa River northern pike., 42 <br />14. Relationship between fish prey length and northern pike length <br /> by prey species. 44 <br />15. Colorado squawfish and roundtail chub vulnerability to predation <br /> by northern pike based on comparison of gape and body areas. 47 <br />16. Vulnerability of six Yampa River fish species to predation by <br /> northern pike based on estimated index of largest prey size. 49 <br />17. Bluehead sucker and flannelmouth sucker vulnerability to <br /> predation by northern pike based on comparison of gape <br /> and body areas. 51 <br />18. White sucker and common carp vulnerability to predation by <br /> northern pike based on comparison of gape and body areas. 53 <br />19. Relative vulnerability of potential fish prey species to <br /> northern pike predation based on percentage of predator <br /> population with adequate gape area to ingest prey species <br /> individuals with smallest, median and largest cross- <br /> sectional body areas. 56 <br />20. Upstream and downstream movement of radiotagged and <br /> Floy-tagged northern pike between observations or recaptures. 59 <br />21. Time intervals between northern pike recaptures within river <br /> reaches showing average, maximum and minimum, and intervals <br /> between river reaches for upstream and downstream directions. 65 <br />22. Growth rate in mm and gm for Floy-tagged northern pike <br /> recaptured within a year ~300 days). 71 <br />23. Growth rate in mm and gm for Floy-tagged northern pike <br /> recaptured over time intervals of 0.9-5.1 years. 74 <br />24. Length frequency distributions of channel catfish in the Yampa <br /> River by year. 79 <br /> <br />viii <br />