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13 <br />striped bass spawning from May 5-9, May 20-24, and after June 9, 1980. <br />Water temperature at Gypsum was within or above the range suitable for <br />bass spawning throughout the 1981 sampling period. <br />Catch <br />Spanish Bottom <br />During the study, 15 species of fish were collected and identified <br />at the two study sites (Table 1). Although gillnets were fished from <br />May 7-21, 1980, and from May 26 - June 2, 1981, near Spanish Bottom, no <br />striped bass were captured above the Cataract Canyon rapids. Although <br />water temperature was lower than ideal for striped bass spawning during <br />the 1980 season, temperature was within the range normally reported for <br />bass spawning during 1981. <br />Flannelmouth sucker and carp were the most frequently captured <br />species in a total of 871 gillnet hours of sampling above the rapids <br />(Table 2). Brown trout was the second most common species captured in <br />1981 but was not collected in 1980. Three Colorado squawfish and two <br />razorback suckers collected in 1980 were captured immediately upstream <br />from the confluence, on the Green River side where water was 2-3 m deep <br />in a slower reach. Two Colorado squawfish captured in 1981 were in slow <br />reaches between Spanish Bottom and the confluence at a depth of 2-3 m. <br />Relatively low catches in gillnets at Spanish Bottom were attributed <br />to a lack of suitable netting areas and drift that clogged nets. It is <br />also likely that the fish population above the rapids was lower than that <br />found below the rapids in the headwater mixing zone.