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of these stations were presented by Prewitt (1977). Fishes collected approxi- <br />mately 10 km downstream from Station W-A in August, 1976, were combined with <br />W-A collections for analysis. <br />Special field work was conducted in 1978 to 1) obtain gametes from <br />flannelmouth suckers and bluehead suckers for artificial fertilization to <br />allow us to raise a larval series for identification purposes, and 2) determine <br />the current distribution of endangered fishes within our sampling area. Fish <br />sampling was conducted April 21-22 at Stations Y-2J, Y-3, Y-4, and W-A. On <br />May 20-21, sampling was conducted at Round Bottom, 1.0 km downstream from <br />Craig, and at regular sites Y-2J and Y-3. Electrofishing at Round Bottom was <br />conducted in cooperation with Mr. Dale Thompson, a biologist with Colorado- <br />Wyoming Coal Company. This special site was sampled because of its unique and <br />diverse habitat. Backwaters in this river section have been selected for <br />modification and preservation as potential squawfish nursery areas by Colo- <br />bJyo Coal Co. Stations W-A, W-B, Y-2J, and Y-4 were sampled on May 31- <br />June 1. On June 25, Station W-A was sampled again. Another special field trip <br />planned and sponsored by the Colorado Division of Wildlife was conducted <br />October 1G-12 after termination of our BLM contract; Cross Mountain and Juniper <br />Springs Canyons were sampled specifically for endangered fish distribution. <br />Macroinvertebrate sampling sites <br />Sampling sites for aquatic macroinvertebrates were chosen in a non- <br />random manner, approximately equally-spaced along a longitudinal gradient, <br />below major tributaries and/or towns. No effort was made to locate macro- <br />invertebrate collection sites at fish sampling stations. <br />The Yampa River was sampled at six sites (Y1-Y6) from Steamboat <br />Springs to. Cross Mountain, a distance of about 177 river km (Figure 3, Table 7). <br />29 <br />