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Last modified
7/14/2009 5:02:28 PM
Creation date
5/22/2009 4:47:09 PM
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UCREFRP
UCREFRP Catalog Number
3009
Author
Holden, P. B. and E. Wick.
Title
Life History and Prospects For Recovery of Colorado Squawfish
USFW Year
1981.
USFW - Doc Type
Manuscript for 1982 Paper.
Copyright Material
NO
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<br />regularly, and sudden movements of over several hundred km up or <br />downstream occur. <br />Movements of young fish in a backwater were studied by Holden <br />(1977). His study suggested considerable movement either within a back- <br />water, or between the main channel and the backwater. This was based on <br />a mark-recapture study for 2-1/2 days. The USFWS is presently studying <br />young fish movement and they have found a daily movement pattern in and <br />out of backwaters (Personal communication, Charles McAda, USFWS, 1980). <br />Just where the young fish are when they are not in the backwater has not <br />been determined. <br />To our knowledge, there is no data at present to suggest how far <br />downstream young squawfish move after hatching. Holden and Crist (1981) <br />suggested downstream drift was not a long distance affair but probably <br />lasted only until suitable habitat was reached. Bill Pearson (Personal <br />communication, University of Louisville, Louisville, KY, 1980) conducted <br />a study of invertebrate drift in the Green River in the mid-1960's. He <br />never caught a larval fish during that study, and only saw one fish egg <br />in his nets. Recent collections of larval and young-of-the-year <br />squawfish in the Yampa and Upper Colorado rivers suggest some downstream <br />movement, perhaps as much as about 150 km, may be occurring. Col- <br />lections of young-of-the-year for the past 15 years (Vanicek and Kramer <br />1969, Holden and Stalnaker 1975a, Holden 1977) in the lower Colorado and <br />Green rivers do not support a hypothesis of long distance downstream <br />movement by larvae. These data, along with general observation in the <br />field, suggest downstream larval fish movement of all the native species <br />of fish in the Upper Colorado System did not evolve as a reproductive or <br /> <br />14 <br />
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