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Table 1. Summary of sampling effort and the number of native and nonnative <br />fishes captured and recaptured with electrofishing up- and downstream <br />of the Grand Valley Irrigation Company Diversion Dam, April through <br />October 1998. Note: Fish were only marked downstream of the diversion <br />dam. Refer to Appendix Tables B.1. and C.1. for the number of fish <br />marked and recaptured by species. <br />River Number of Hours Electrofishin4 Total Number <br />Stage/ Upstream of Downstream of Marked/Tagged or Total Number <br />Sampling Diversion Diversion Captured Recaptured <br />Date 187.6-185.5 185.3-183.0 Native Nonnative Native Nonnative <br />Pre-runoff <br />04/03 1.18 32 0 -- -- <br />04/13 0.81 128 21 0 0 <br />04/14 0.59 69 10 0 0 <br />04/16 0.77 83 18 0 0 <br />04/20 0.66 61 15 2 0 <br />04/23 0.81 110 14 2 0 <br />04/24 0.64 83 18 3 2 <br />04/27 0.77 109 58 0 0 <br />04/27 1.65 180 38 6 0 <br />Subtotal Upstrm 0.77 109 58 0 0 <br />Subtotal Dwnstrm 7.11 746 134 13 2 <br />Post-runoff <br />07/17 0.62 95 5 3 0 <br />07/20 0.59 84 8 1 0 <br />07/21 0.61 23 3 0 1 <br />08/19 0.88 283 19 0 0 <br />08/19 0.69 66 19 0 0 <br />08/20 0.99 292 24 0 0 <br />08/20 0.78 109 21 0 0 <br />08/24 0.83 370 21 0 0 <br />08/24 0.68 190 4 10 0 <br />08/26 0.89 258 22 0 la <br />08/26 0.88 i27 22 7 1 <br />08/28 0.93 326 23 0 0 <br />08/28 0.87 131 28 6 2 <br />09/23 0.87 175 10 0 0 <br />09/24 0.82 213 14 0 0 <br />10/15 0.94 102 11 0 0 <br />10/20 0.84 97 9 0 0 <br />10/21 0.78 86 10 0 0 <br />Subtotal Upstrm 8.77 2,202 163 0 1 <br />Subtotal Dwnstrm <br />------------- <br />-- 5.72 825 110 27 4 <br />- <br />- <br />TOTALS Upstrm --------- <br />9.54 --------------- -------------- <br />2,311 ------------ <br />221 ------------- <br />0 -------- <br />1 <br />TOTALS Dwnstrm 12.83 1,571 244 40 6 <br />a denotes the only marked fish recaptured upstream of the diversion dam. <br />8 <br />