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Table 3.11. General Habitat Requirements for Important <br />Occurring in the Colorado River.1 or Abundant Fish Species <br /> Spawning General Habitat <br />Species Abundance2 Time Habitat Young Adults <br />Endangered Species <br />Bonytail Chub3 <br />(Gila elegans) R Late spring - Not known Not known Suspected to occur in <br /> summer pools and eddies at <br /> varying depths gen- <br /> erally over silt and <br /> silt-boulder substances <br />Humpback Chub <br />( Gila cypha) R Spring-summer Not known Small quiet pock- Deep swift water with <br /> ets on rock rocky substrates <br /> benches or along <br /> steep canyon walls <br />Colorado Squawfish3 <br />(Ptvchocheilus lucius) R Early to mid- Quiet backwaters Quiet Backwaters Deep areas of large <br /> summer and side channels rivers <br />Razorback Sucked <br />(Xvrauchen texanus) R Spring Gravel bars Unknown Stillwater areas <br />Other Species <br />Rainbow Trout <br />(Salmo gairdneri) C Spring Smaller Protected areas Moderate flow areas <br /> tributaries with gravel bottoms <br /> in fine gravel and good riffle-pool <br /> development <br />Mountain Whitefish <br />(Prosopium williamsoni) C Fall Gravel-rubble Shallow areas Similar to rainbow <br /> substrate trout <br />Roundtail Chub <br />(Gila robusta) A Late spring- Gravel bars Shallow quiet Riffles to back- <br /> early summer waters waters <br />w <br />N