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Title: Colorado squawfish spawning (deposition) 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: 1 Jul-31 Aug <br />Location: Designated spawning areas. <br />Data utilized: <br />Yampa-and Green River radio observations on spawning reaches <br />1981-1984. <br />Data excluded: <br />All capture and radio observations during other than the <br />spawning period and on other areas, not considered spawning <br />sites. <br />Radio observations of Colorado squawfish in water greater <br />than 5.5 ft total depth because these habitats were <br />considered staging/resting habitats for which separate curves <br />were developed. <br />Assumptions: <br />1. Substrate observations reflect a substrate preference for <br />Colorado squawfish spawning (deposition) behavior. <br />Constraints: <br />I. Curves applicable only where Colorado squawfish have been <br />observed to spawn. <br />Curve Coordinates: <br />X Y <br />Code (SI ) <br />3.0 0.0 <br />4.0 1.0 <br />5.0 0.0 <br />• ~15- <br />