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RESULTS <br />Gypsum Canyon (river miles 196-200) <br />Striped bass, carp, channel catfish, and walleye were the most frequently <br />captured species during 4,620 hours of sampling with gillnets (Table 1). <br />Bass ranged in size from 425 to 776 mm total length (mean = 568 mm). More <br />than twice as many male striped bass as females were captured (Table 2). <br />Sexually mature males were captured during the entire sampling period, whereas <br />sexually mature females were not captured until May 20. Spent females first <br />appeared in the catch June 11 and were captured during the remainder of the <br />sampling period. A single spent male was positively identified on June 16. <br />Males which appeared to be partially spent were captured after June 1. <br />Surface water temperature varied from 12.8 to 17.2°C (55-63°F) during <br />the sampling period (Figure 1). Examination of 13 references on striped <br />bass spawning temperatures indicated that spawning most often occurred at <br />15.6 to 17.8°C (60-64°F) (Figure 2). Water temperatures at Gypsum Canyon <br />were within the range of temperatures normally present during striped bass <br />spawning from May 5 to May 9, May 20 to May 24, and after June 9. The catch <br />of bass (rolling average of three catches) showed the same general pattern <br />as surface water temperature, with a peak catch in early May 2-8, a second <br />peak in mid-May 20-24 and a third peak in mid-June 15th. There was evidently <br />no relationship between estimated discharge and catch of bass.