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~ .~ support and encouragement. C. A. Rarp and --- reviewed and provided comments on the draft manuscript. Literature Cited APPENDIX The abundance approximations for adult Colorado squawfish in the mainstream Green river are summarized in the text and presented fn Table 2. The following computations .are provided to aid the reader in following the methods and procedures employed: Method 1. Electrofishing is a common tool used by fishery workers to capture larger fish, which are most vulnerable to capture (Reynolds 1983). Lanigan and Tyus (1988) used this technique to estimate the population size of the razorback sucker in the upper Green River, using mark and recapture methods. A population estimate for the razorback sucker was considered valid because we believed the assumptions of geographic and demographic closure were met for this species, whereas the Colorado squawfish does not meet these necessary assumptions. However, these two species are collected together in this same location, and in similiar habitats: shoreline habitats by Colorado squawfish during most of the year (Tyus et al 1984), and by razorback sucker during the spring (Tyus 1987). Although electrofishing effeciency (Reynolds 1983) was probably different for these species, I used the size of the estimated adult razorback sucker population to approximate the standing stocks of 3uvenile and adult Colorado squawfish in the same location. This comparison 39