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Last modified
7/14/2009 5:01:46 PM
Creation date
5/20/2009 11:04:46 AM
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UCREFRP
UCREFRP Catalog Number
7911
Author
Platts, W. S.
Title
Validity Of Methodologies To Document Stream Environments For Evaluating Fishery Conditions, (from syposium and species conference on instream flow needs, West. Div. Am. Fisheries Soc., and Am. Soc. Civil Eng., Boise, ID, May 3-6, 1976)
USFW Year
1976
USFW - Doc Type
Proc. Symp. and Spec. Conf. on Instream Flow Needs
Copyright Material
YES
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275 <br />Order <br />Stream order was determined by methods originally developed by Horton <br />(1945) and later modified by Strahler (1952, 1957). <br />FISH COLLECTION <br />The low concentration of total dissolved solids (60 p/m) in stream waters <br />meant that more reliable fish population samples could be obtained with explo- <br />sives than by using electrical fish collecting equipment. A total of 2.75 miles <br />of stream were sampled at 291 stations, using 4 miles of explosive prima cord. <br />A 0.125- or 0.225-inch mesh net was stretched across the stream to block <br />fish from moving out of the sampling area prior to the explosion. The net <br />and the effectiveness of prima cord assured an unbiased collection of 100 per- <br />cent of the fish population within each sample area. All collected fish were <br />identified and measured from tip of snout to end of longest lobe of the caudal <br />fin. <br />COMPUTER ANALYSIS <br />The CUMDIS (cumulative distribution) statistical program (package 52) was <br />used to generate cumulative frequencies, means, and standard errors about pre- <br />determined variables. All confidence limits were calculated by using t values <br />at the 95 percent level. The STAPTPAC/LIBRARYA unit at Utah State University <br />was used to run an inverted matrix multivariate analysis. <br />FINDINGS <br />Only selected data appear in this report. If the reader wishes to review <br />complete information concerning the relationships between aquatic variables, <br />the relationship between aquatic variables and fish populations, and multi- <br />variable control of fish populations, the author can provide a report titled <br />"Geomorphic and aquatic conditions influencing salmonids and stream classifi- <br />cation--with application to ecosystem classification." The work was supported <br />by the Forest Service SEAM (Surface Environment and Mining) Program. <br />Effect of Channel Materials on Fish Populations <br />Many authors have demonstrated that excessive fine sediment is detrimental <br />to aquatic life (for example, Cordone and Kelly 1961, Phillips and Campbell
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