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MATERIALS AND METHODS <br />Fish were collected during the period April 26 - June 18, 1980 with <br />31 m long x 3 m deep, 6.4 cm square-mesh gillnets at the head of Lake Powell <br />near Gypsum Canyon (river miles 196-200). One end of the net was attached <br />by rope to the shore and the net was fished in water from 1-8 m deep. Nets <br />were checked every 4-5 hours during the day and were set overnight for <br />approximately 12 hours. In addition, nets were fished near Spanish Bottom <br />at river mile 213 above Cataract Canyon from May 7-21 to determine if bass <br />moved up through the rapids. Catch per gillnet hour was reported in terms <br />of a 31-m net. <br />All fish captured were identified, weighed, and measured for total <br />length. Stomachs of adult striped bass were collected and preserved in <br />10% buffered formalin. Gonads were also examined to determine their stage <br />of maturity and preserved when maturity was questionable. <br />All striped bass captured were classified into one of the following <br />stages of maturity, based partly on Scruggs (1957). <br />Immature. Immature testes were small and threadlike. Ovaries were <br />small and contained no developing ova. The color varied from pale gray to <br />deep red, and the main blood vessels of the ovary were not dilated. <br />Maturing. Maturing testes were very large and the color varied from <br />pale pink to white. Ovaries in maturing females were enlarged, contained <br />developing ova, and varied in color from cream to orangish-yellow. The <br />blood vessels of the ovaries were dilated. Developing ova were small (less <br />than 1-mm diameter) and cream colored. The ratio of ovary weight to body <br />weight averaged 1:45. Scruggs (1957) reported a ratio of 1:40 in South Carolina. <br />Mature. Mature testes were very large, white, and they released milt <br />when the fish were gently stripped. Mature ovaries were very large with