PART III. FOOD HABITS AND FORAGE FISH 115 



INTRODUCTION 117 



Purpose 117 



Scope 117 



Study Area 118 



METHODS 119 



Food Habits Analyses 119 



Forage Fish Survey 120 



EXISTING SITUATION 121 



Stomach Contents 121 



Sauger 121 



Burbot 123 



Channel Catfish 123 



Goldeye 126 



Shovel nose Sturgeon 126 



Flathead Chub 131 



Other Species 131 



Food Selection 131 



Forage Fish Survey 132 



IMPACTS OF WATER WITHDRAWALS 137 



Riffle Habitat 137 



Slow-water Habitat 138 



SUMMARY 141 



APPENDIXES 143 



A. Projections of Future Use 145 



B. Tongue River Water Temperatures 153 



C. Taxonomy of Fish Species Encountered in these Studies 157 



D. Taxonomy of Invertebrates Found in Fish Stomachs 159 



E. Average Body Volume of Major Organisms Found in Fish Stomachs. . 161 



F. Results of Food Habits Analyses of Sauger, Burbot, 



Goldeye, Channel Catfish, and Shovelnose Sturgeon 163 



G. Yellowstone Basin Forage Fish Reported by Brown (1971) 171 



LITERATURE CITED 173 



