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1.6 <br />Gypsum Canyon <br />A fyke net was fished in quiet, shallow water of Gypsum Canyon for <br />38 twelve-hour sets between June 13 and July 12, 1981. The net was set <br />for 16 daytime periods and for 22 nighttime periods. <br />Threadfin shad were abundant and made up 57% of the total number <br />of fish captured by fyke net (Table 3). Channel catfish was the second <br />most abundant species captured, and carp and black bullhead were <br />common in the net. Two striped bass, including a 340-g one-year-old <br />and a 3,800-g spent adult were captured. Two Colorado squawfish <br />were captured on June 17: 1) 490 mm TL, 907-9, and 2) 485 mm TL, <br />794-g. <br />Threadfin shad and channel catfish were more abundant in day <br />sets; other species were more common in night sets. Channel catfish <br />may have been attracted to the net by shad which the small catfish <br />frequently consumed. <br />The fyke net effectively sampled smaller fish not captured by <br />gillnets, particularly threadfin shad. Red shiner, another forage fish, <br />was relatively abundant in Gypsum Canyon but was generally too small <br />to be captured by the fyke net. Other species captured by dip net <br />and seine were sand shiner and fathead minnow. <br />Carp, striped bass, walleye, and channel catfish were the most <br />frequently captured species during 8,229 hr of sampling with gillnets <br />in 1980 and 1981 (Table 4). Striped bass was the most frequently <br />collected species in 1980; carp and walleye were most abundant in 1981 <br />catches.