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Table 1. Number of fish collections made each year with the various types of <br />gear, Green River, 1963-1966. <br />Year <br />Gear 1963 1964 1965 1966 Total <br />Shocker 4 69 22 26 121 <br />Seines 0 97 92 75 264 <br />Gill nets 24 47 83 69 223 <br />Fry gear 0 <br />- - - - - 0 <br />- - - - - 32 <br />- --- --- - 27 <br />- - - - - - - 59 <br />- - - - <br />_., Total 28 213 229 197 667 <br />• <br />RESULTS <br />All data collected and utilized in the formulation of conclusions are <br />presented in the appended theses by W. D. Pearson and C.. D. Vanicek with the <br />.r .} =-singular exception of the fishes--collected-by D. R. Franklin in 1963. During <br />the 4-year period, '21 species of fish were-collected, 13 in 1963 and 20 in <br />1964-1966 (Table 2). The greater number of species taken in the latter '3 <br />years most likely was the result of greater intensity of sampling and greater <br />familiarity with the river and the use of different sampling methods. The <br />notable exception to this general pattern was that all three specimens of the <br />humpback chub-(GilArcypha) taken rr the-study were taken in July, 1963. One <br />was taken at Echo Park and was identified by Dr. R. R. Miller as "Apparently <br />representing Gila cypha" (letter to Earl M. Semingsen, October 23, 1963). <br />The other two were extremely humped forms which closely resemble Gila cypha. <br />One was taken at Island Park and the other at Swallow Canyon, above Dinosaur <br />National Monument. Little is presently known of the variability within <br />-morphological -characteristicsof Gila robusta or Gila cypha, and the identi- <br />fication of these two specimens remains tentative. <br />0