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,. <br />-~.- <br />may be even more rare in the Grand Ca-~on region than is Gila ha, and it is <br />in danger elsewhere. <br />Rxotic fishes do not seem to have increased significantly in the area aurvey- <br />ed, at least not since 1968 when I was one of four ichthyologists that worked the <br />area between Lee's Ferry and Diamond Creek. (See enclosed copy of brief report <br />on that survey). A major problem confronting the native fishes is fluctuations <br />in the flow and temperature of the river, which can curtail or prevent successful <br />ranrn~inY+inn tF~u¢•e Hnvaver 's'$ do *!ot hmv° ~n~ ~+e i^fn`"'"a+i^'3 on +y':° a{.'.~.L^.'.~a^.Ce <br />y _ .Fiv~w 6 b , b Ss vi~r4a `_~~ yea.a l~G it u it !V <br />of exotic fishes and of their precise ecological relationship to native species. <br />Since 1938, Fundulus zebrinus has worked its way down the Little Colorado to its <br />mouth (we took none there in 1968) and it also was taken in 1975 at the mouth of <br />Parashont Wash (RM 198.5), well above Diamond Creek. This species when introduced <br />has found to have a detrimental affect on native fishes in Texas (Clark Hubbs and <br />Wauer, 1973, SW Nat., 17: 375-379)• There is little hope, however, that F. zebrinus <br />can be eliminated from the Little Colorado or any other waters wherc~.t has now <br />become established. <br />Submitted by: <br />Robert R. Miller <br />1x:19:1975 <br />Museum of Zoology <br />IIniversity of Michigan <br />RRM:~bp <br />