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Y' <br />r . <br />Title: Colorado squawfish spawning temperature utilization curve. <br />Parameters: Mean daily water temperature (C ) <br />Period: 1 Jul - 31 Aug <br />Location: Yampa River, Green River and Colorado River designated spawning <br />areas. <br />Data Utilized: <br />1. USGS Stateline gauge data for Colorado River. <br />2. CRFP grab and thermograph records for the Yampa and Green River <br />spawning sites taken during observed spawning activity. <br />3. Spawning dates were estimated by back calculating from larval <br />fish sizes for the Colorado River. <br />4. USGS Deerlodge Park gauge records. <br />Data excluded: <br />1. Incidental temperature grab sample records throughout the basin <br />at various times of the year. <br />2. Hatchery and laboratory spawning data because they have less <br />application in natural systems. <br />Assumptions: <br />1. Actual observations in the natural system during Colorado <br />squawfish spawning reflect suitable temperatures regimes. <br />2. The past four years have provided suitable temperatures for <br />spawning. <br />Constraints: <br />1. Curves applicable only for the spawning reaches for which they <br />have been developed. <br />Coordinates: <br />Colorado River <br />X (C ) Y (SI) <br />18 0.0 <br />22 1.0 <br />30 1.0 <br />32 0.0 <br />___ Absolute minimum 16 degrees C <br />Absolute maximum 32 degrees C <br />At least 14 days of 21 degrees C <br />Y <br />