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<br />Aquatic Ecosy.tem of the Colorado River in Grand Canyon <br /> <br />TABLE OF CONTENTS (Continued) <br /> <br />Distribution and Abundance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 47 <br />Pre-dam (Before 1963) ...... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 47 <br />Post-dam (1963-1998) ............................................... 48 <br /> <br />Status of Native Fishes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " 56 <br />Humpbau:k Chub .................................................... 57 <br />Flannelmouth Sucker ................................................ 58 <br />Bluehead Sucker .................................... . . . . . . . . . . . . . . .. 61 <br />Razorback Sucker................................................... 61 <br />Speckled Dace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 63 <br /> <br />CHAPTER 5 LIFE HISTORY AND ECOLOGY OF NATIVE FISHES ................... 65 <br /> <br />lDtroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 65 <br />HumpbackChub ......................................................... 65 <br />F1annelmoutb Sucker ........................................:'............ 77 <br />BlueheadSucker ......................................................... 81 <br />Razorback Sucker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 84 <br />Speckled Dace ........................................................... 88 <br />Limiting Factors ......................................................... 91 <br />Physical Habitat Loss ........................................,....... 91 <br />Water Temperature .................................................. 93 <br />Water Quality ...................................................... 95 <br />Food Supply ....................................................... 95 <br />Predation . . .. . .. . .. . .. .. .. . . .. . . .. . . .. .. .. .. . .. .. . .. .. . .. .. .. .. .... 96 <br />Parasites and Diseases ................................................ 97 <br /> <br />CHAPlER 6 LIFE HISTORY AND ECOLOGY OF NON-NATIVE FISHES .............. 99 <br /> <br />Introduction. . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . '.' . . . . . . . . . . . . . . . . . . . . . . . . . . .. 99 <br />Common Carp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . . .. 100 <br />Channel Catfish......................................................... 103 <br />Fathead Minnow ........................................................ 105 <br />Red Shiner. . . . . . . . . . . . . . . . . . . . . . . .. . . . . .',.. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 107 <br />Plains Killifish ...................:..................................... 109 <br />Striped Bass .......................,................................... 110 <br />Rainbow Trout ......................................................... 112 <br />Brown Trout ........................................................... liS <br />Limiting Factors for Non-Native Fishes ..................................... 118 <br /> <br />HabitatLoss ...................................................... US <br />Water Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 119 <br />Food Supply ...................................................... 120 <br />Parasites and Diseases. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 120 <br /> <br />CHAPTER 7 NA TIVElNON-NA TIVE FISH INTERACTIONS ........................ 121 <br /> <br />Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 121 <br /> <br />ii <br />