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DRAFTI9 <br />...- --~ <br />Table 11. Degree day accumulation from y 1 to October 30, 1 - 6, based on USGS gage <br />at Green River, Utah, and average size of Colors ua summer, fall and spring. <br />~, 0 30 <br /> Total ~ <br />Degrees AVG Total Length <br />Sumner Fall Spring <br />1991 3841 34.9 41.2 <br />1992 3921 22.6 35.9 59.0 <br />1993 3638.5 24.1 38.1 44.7 <br />1994 3972.5 20.2 44.9 52.8 <br />1995 3521.5 22.0 26.0 28.5 <br />1996 3688. 13.0 38.8 44.9 <br />~k ~ <br />Overwinter survival <br />~~`~~ Overwinter survival rates (OWS) of Colorado squawfish and NNC were calculated based <br />~" <br />on the percent decline in catch rates between fall and the next spring (Table 13). Colorado <br />squawfish OWS ranged from 7.5 to 70.1%, with a mean of 32.5%. Non-native cyprinid OWS <br />st,~w <br />ranged from 20 to 104%, with a mean of 45.3%. The OWS rates were correlated with several <br />other variables (Table 12): Most notably,, quawfish OWS was positively correlated with fall <br />habitat volume, fall tom n~gth, and total degree days. The combined step-wise regression of <br />habitat volume and total length resulted in an r2 of .93 (p=.09). OWS was negatively correlated <br />C~ L ~ SQe a.~.~uv~ ~LI~ -fa dee-('~e,• w~ c ~ ~ <br />with high peak flows. Al dough squawfish numbers and CPE in the fall were negatively correlated ~~~, <br />/K ~`~ 7 <br />with habitat volume, and positively, although weakly, correlated with high peak flows, OWS ~ N ~c <br />1 ~ ~ <br />?rates show an opposite effect. ~~ <br />• ~ The odd effect of uawfish OWS bein ositivel Corr 1 <br />~,,,~- sq g p y e ated to fall NNC catch rates rs~ anan art act <br />-19- ~~~ <br />