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usual population estimation constraints, and 7. A computed overall average using the summation of the output of all above methods. Methods used to compute these approximations are presented in the Appendix. All of the abundance appraximations are summarized in Table 2. Although the methodology used was admittedly crude, and some were based on different manipulations of similiar data sets, I believe the resultant range of axerages -10$5¢ d.- @ w w ~2'~ (3,875 - 17,252 fish) is realistic for the mainstream Green~River. The grand average of all approximations, about 8,000 adult fish, was reasonable. 1~ie accuracy of these approximations is unknown However, the precision obtained ~-- /~1 N L in so doing this work was surprisingly god. This high degree of pre~ision obtained, implies that an inherent bias was common in all methods attempted, or suggests that the grand average is reasonably accurate. -------------------------------------------- - - : Tim tc s-~R,~e~ ~~ /~` U Table 2. Six approximations of the population size of Colorado squawfish in the upper Green River, 0-552 km. Approximate population size Method -------------------------------------------------- range of values average 1 - ~ 7,176 2 775-3,875 2,326 16