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<br />Table Sensitive areas for rare and endangered Colorado River fishes in t e Yampa River, with notes <br />on potential limiting factors. (Updated from UCRBCC Biology Subcoimnittee report (1984). <br />Life stage or need Locationl Season Potential limiting factors <br />COLORADO SQUAW FISH <br />Adults <br />Adult concentration <br />Migrations <br />Spawning <br />Larvae <br />Postlarvae <br />Juvenile <br />0-140 All year Microhabitat changes with stream discharge, fishing <br />51-124 August-May and "natural" mortality, competition with non-native <br /> fishes, spring flow depletions, food availability <br />0-140 May-August Stream blockage, micro habitat conditions, stream temp- <br /> eratures, disc ha rye & photoperiod relationship <br />4-32 June-July Proper flow conditions for the type water year (low, <br /> July-August averaye, and high), spawning and orientation cues, low <br /> number of spawning females, siltation of substrate, <br /> temperature-discharge-photoperiod relationship <br />0-31 July-August Proper flow regimen, water temperature, food availability, <br />0-4 August-Dec. competition/predation, habitat availability <br />0-140 All year Competition/predation with non-native fishes, food, stream <br /> passage during low flows <br />HUMPBACY. CHUB <br />Adults <br />Adult concentration <br />Spawning <br />Larvae <br />Postlarvae <br />Juvenile <br />0-56 All year Effects of flow changes on microhabitats, competition/ <br />4-37 All year predation of non-native fishes, food availability, <br />18-56 May-June i:herrnal regimen versus photoperiod--discharge relationship, <br />18-56 May-July spring spawning flows <br />18-56 July-Dec. <br />0-56 All year <br />RAZORBACK SUCKER <br />Adults <br />Spawning <br />0-60 All year Reproductive failure, competition/predation, food, low <br />0-4 April-June population size, spring flows <br />1 Location given in miles from confluence with the Green River=0. <br />