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<br />Attribute #1: Water Temperature <br /> <br />Grass carp metabolism and aquatic vegetation consumption is determined by water <br />temperature. Feeding activity is greatest from 70-80 F and negligible below 50 F. An obvious <br />relationship between lake elevation and accumulated daily temperature units (DTU s) > 55 F exists, as <br />can be seen in the figure below. <br /> <br />ACCUMULATED DAILY TEMPERATURE UNITS >55F (DTUs) <br />BY ELEVATION (feet) FOR COLORADO LAKES AND PONDS. <br /> <br /> 2500 <br /> 2000 <br />ACCUMULATED <br />DAILY 1500 <br />TEMPERATURE <br />UNITS >55F <br /> 1000 <br /> 500 <br /> 0 <br /> 4000 <br /> <br /> <br />6000 8000 10000 12000 <br />LAKE ELEVATION (feet) <br /> <br />From the table below, determine the DAILY TatIPERA TURE UNIT (DTU) VALUE for your <br />lake using the lake elevation m: DTU if known. <br /> <br />Elevation Accumulated DAILY DTU <br />of Lake (ft) TEMP. UNITS (DTU) VALUES <br />---------- ----------------- ------ <br />-------- ----------------- ------ <br />3500 - 5500 1800 - 2450 HI (High) <br />5500 - 6500 1450 - 1800 MHI (Medium-High) Reco['d the <br /> DTU VALUE <br />6500 - 7500 1100 - 1450 MED (Medium) (HI,MHI,MED, <br /> MLO 0[' LO) <br />7500 - 8500 750 - 1100 MLO (Medium-Low on the <br /> Wo['ksheet <br />8500 - 9500 400 - 750 LO (Low) <br />> 9500 < 400 * <br /> <br />* We recommend NOT stOCking grass carp above this elevation unless DTUs are <br />known to be >400. <br /> <br />36 <br />