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of DNM to RM 22 (RK 35) near the confluence of the Green and Colorado rivers. <br />Backwaters were sampled 1979 - 1485 in the Green 3iver. Backwaters in the <br />Yampa and White rivers were sampled only in 1981 (Miller et al. 1982a, b). <br />A long-term fall sampling program was developed in 1980 and continued <br />through 1985. The number of backwater/shoreline habitats sampled was reduced <br />to one replicate sample per each 8 km of river, shoreline runs (10-50 m2 area) <br />were seined near the sampled backwaters, standard 3x5 mm2 mesh nets were used, <br />and sampling was done only in October. <br />Collections in 1979 were made with 6 mm2 (1/4 in2) and 3 mm2 (1/8 in2) <br />mesh seines. However, the smaller 3 mm2 mesh size did not pass mud as <br />efficiently as the 6 mm mesh, and tended to fill. In many cases we noted a <br />higher mortality of small fish with the smaller mesh size but no increased <br />catch. In 1980 and thereafter, an intermediate 3X5 mm2 (1/8 X 3/16 in2) mesh <br />size was used as a standardized collection tool in the Green River Basin. To <br />further reduce in-field mortality, sampling was begun in Dctober when average <br />fish size was larger than 20 mm TL. <br />A spring YOY collection was made in early 1984 (Strata A, B, E, and F) <br />because of a very low catch of Colorado squawfish in 1983. The purpose of <br />this sampling was to estimate the effectiveness of the fall sampling program <br />and to evaluate over wintering mortality. <br />COLORADO SQUAWFISH SPAWNING COLLECTIONS <br />Possible spawning areas for Colorado squawfish were identified in 1981 <br />using radiotagged fish, collections of ripe fish and collections of larvae. <br />The radiotracking effort was intensified during the suspected Colorado <br />squawfish spawning season (July-August). When signals from more than one <br />IS <br />