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Title: Colorado squawfish juvenile (60-450 mm) substrate <br />utilization curve. <br />Parameters: Numeric range of values for substrate types. <br />CODE SUBSTRATE TYPE <br />1. Silt and clay <br />2. Sand <br />3. Gravel <br />4. Cobble <br />5. Boulder <br />6. Bedrock <br />Period: Year around <br />Location: Colorado, Green and White river reaches designated as <br />concentration or high concentration areas for juvenile <br />Colorado squawfish. <br />Data utilized: <br />All substrate data in RARE file for Colorado squawfish <br />60-249 mm TL,1979-1983. <br />Data excluded: <br />.Radio telemetry data due to limited sample size. <br />Assumptions: <br />1. Substrate in the vicinity of fish captures reflect sub- <br />strate preference. <br />2. Both juvenile size classes (60-249 and 250-450) utilized <br />similar substrates. <br />Constraints: <br />Curve is applicable to upper Colorado Basin rivers <br />occupied by juvenile Colorado squawfish. <br />Curve Coordinates: <br />X (Code) <br />1.0 <br />2.0 <br />3.0 <br />5.0 <br />6.0 <br />Y (SI ) <br />1.0 <br />1.0 <br />0.05 <br />0.05 <br />0.0 <br />-33- <br />