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<br /> 90 <br /> 60 <br /> 30 <br />C\I <br />E <br />0 <br />~ 0 <br />'- <br />I <br />0 <br />I- <br /><( <br />0 <br /> 50 <br /> 40 <br /> 30 <br /> 20 <br /> 10 <br /> 0 <br /> <br />BIOLOGY OF YOUNG COLORADO SQUA W""\ <br /> <br />83 <br /> <br />150 <br /> <br />JUL Y / AubuST <br /> <br />120 <br /> <br /> <br />96 <br /> <br />160 <br /> <br />288 <br /> <br />352 <br /> <br />416 <br /> <br />480 <br /> <br />224 <br /> <br />SEPTEMBER/OCTOBER <br /> <br /> <br />KILOMETERS <br /> <br />FIGURE 2.-Average catch of age-O Colorado squawfish in backwaters per 100 m2 seined in the Green River, <br />July-August 1981 and 1984-1988 (upper) and September-October 1979-1985 and 1987-1988 (lower). Distance <br />is measured from the Colorado River. <br /> <br />TABLE 2.-Hatching dates of larval Colorado squawfish captured in the Yampa and Green rivers. Dates were <br />calculated from total lengths of fish and capture date by use of equations of Haynes et al. (1984) and Nesler et al. <br />(1988); N= number offish. <br /> <br /> Yampa and upper Green rivers Lower Green River <br />Year Mean Range" N Mean Range" N <br />1981 Jun 29 Jun I3-Jul 6 36 Jnn 20 Jun 13-Ju14 24 <br />1982 Jul14 Jul IO-Jul 22 98 <br />1983 Jul28 Jun 22-Aug 3 91 <br />1984 Jul30 Jul IO-Aug 6 33 Jul5 Jnn 26--Jul 16 19 <br />1985 Jul5 Jnn 27-Jul 14 183 Jul6 Jun 25-Jul 13 95 <br />1986 Jul20 Jul 9-Jul 27 30 Jul 24 Jul 9-Aug 2 426 <br />1987 Jun 28 Jun II-Jul 16 745 Jun 30 JUII .lO-Ju116 1,490 <br />1988 Jul8 Jun 22-Jul 16 450 Jul6 Jun :!2-Jul 16 252 <br />a Range = dates that included 90% of the sampled fish. <br />