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• Table 1. Hatching dates of larval Colorado squawfish captured in the Yampa <br />and Green rivers. Dates calculated from total lengths of fish and capture date <br />using equations of Haynes et al. (1985) and Kesler et al. (1988). <br />Yampa and <br />upper Green rivers lower Green River <br />Year Mean Rangea N Mean Range N_ <br />1981 Jun 29 Jun 13-Jul 6 36 Jun 20 Jun 13-Jul 4 24 <br />1982 Jul 14 Jul 10-Jul 22 98 <br />1983 Jul 28 Jun 22-Aug 3 91 <br />1984 Jul 30 Jul 10-Aug 6 33 Jul 5 Jun 26-Jul 16 19 <br />1985 Jul 5 Jun 27-Jul 14 183 Jul 6 Jun 25-Jul 13 95 <br />1986 Jul 20 Jul 9-Jul 27 30 Jul 24 Jul 9-Aug 2 426 <br />1987 Jun 28 Jun 11-Jul 16 745 Jun 30 Jun 10-Jul 16 1490 <br />1988 Jul 8 Jun 22-Jul 16 450 Jul 6 Jun 22-Jul 16 252 <br />arange = dates that included 90% of the sampled fish <br />23 <br />