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Last modified
1/26/2010 2:28:29 PM
Creation date
10/12/2006 2:32:13 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8240.200.10.B
Description
UCRBRIP - Riverine Fish Flow Investigations
Basin
Colorado Mainstem
Date
7/1/2001
Author
CDOW
Title
Riverine Fish Flow Investigations 2001
Water Supply Pro - Doc Type
Publication
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<br />RESULTS AND DISCUSSION <br /> <br />Y AMP A RIVER FISH SAMPLES <br /> <br /> <br />Suecies Comuosilion - Duffy and Sevens 1998 to 2000 <br /> <br /> <br />A high degree of consistency was found in species composition offish over IS em <br /> <br /> <br />captured by electrofishing between the three year period 1998, 1999 and 2000 at the Sevens <br /> <br /> <br />and Duffy sampling stations (Table AI). Flannelmouth suckers varied between 46% and SO% <br /> <br /> <br />of the catch at Sevens but were only S% at Duffy. Bluehead sucker was between 18 and 22% <br /> <br /> <br />at Sevens, while only 4 to 6% at Duffy. Roundtail chub were fairly similar between sites with <br /> <br /> <br />4 to 6% of the catch at Sevens and 3 to 4% at Duffy. Colorado pikeminnow were only 0.2% <br /> <br /> <br />of the catch at Sevens, but ranged from 0.6 to I.S% at Duffy. Native fish were more common <br /> <br /> <br />at Sevens and were 72% in 1998 and 68 % in 1999 and 76% in 2000. At Duffy native fish <br /> <br /> <br />comprised only about 14% of the fish population in all three years. <br /> <br />The most common fish at Duffy in all three years was white sucker and white sucker <br /> <br /> <br />hybrids (white x flannelmouth and white x bluehead cross). The white sucker with crosses <br /> <br /> <br />comprised between 69 and 73% of the catch at Duffy, compared to 13 to 17% at Sevens for <br /> <br />the three-year period (Table AI). The next most common fish at Duffy was another non- <br /> <br />native species, small mouth bass ranging from 6% to 10% over the three years. <br /> <br />The consistent or stable species composition at these two sites with three years of fish <br /> <br /> <br />data (Table AI) suggests composition is a likely a function of habitat availability of these <br /> <br /> <br />areas. The discrepancy in species composition of small mouth bass between Duffy and <br /> <br />Sevens strongly appears to be a function of channel morphology or habitat since both sites <br /> <br />have similar physical conditions for flow and temperature. Nesler (199S) proposed it was <br /> <br />reasonable to assume normal runoff flows would be adverse enough to prevent stable <br /> <br />recruitment of small mouth base in the Yampa River. This may be correct at Sevens, but large <br />20 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />
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