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7/14/2009 5:01:43 PM
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UCREFRP
UCREFRP Catalog Number
1110
Author
Lamarra, V., M. Lamarra and J. Carter
Title
Ecological Investigation of a Suspected Spawning Site of Colorado Squawfish on the Yampa River, Utah
USFW Year
1985
USFW - Doc Type
Great Basin Naturalist
Copyright Material
YES
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:~ <br />i <br />January 1985 <br />L,AMARRA ET AL.: SQUAWFISA <br />maximum between 2125 and 0100 hours. No <br />larval fish and only 500 macroinvei•te- <br />brates/hour were captured entering the area, <br />whereas over the same time period five larval <br />fish/hour and over 2000 macroinverte- <br />brates/hour were captured leaving this riffle <br />area. Although drift nets were located at <br />each seining location, larval fish were collect- <br />ed only in nets below this cobble area. Five <br />species of larval fish were identified, includ- <br />ing: speckled dace, rollndtail chub, channel <br />catfish, flannelmouth sucker, and carp. This <br />may indicate that this cobble area habitat <br />may have been used for spawning or as a nur- <br />sery area by species other than squawfish. In <br />earlier studies, squawfish larvae were collect- <br />edbetween river mile 12.1 and 0.1 during 24, <br />25, and 26 July (Haynes and Muth 1982). <br />These larval fish (9.0-13.0 mm) corresponded <br />closely in age with the dates when adult fish <br />were observed to be spawning at river mile <br />16.5 (Tyus et al. 1981). <br />Feeding habits were determined by com- <br />paring benthic and drift samples to fish stom- <br />achs for the locations and times fish were <br />captured (Strauss 1979). Feeding intensity <br />was determined by using a percentage of <br />stomach volume filled. In Table 4, a com- <br />parison is given between the major macroin- <br />vertebrate components in the drift or benthos <br />to the Inajor components of each species diet <br />(dominant four fish species only). These data <br />indicate, and it is reflected in Strauss (1979) <br />Electivity Index (Table 5), that the two na- <br />TesLS 3. Continued <br />133 <br />tives, roundtail chub and speckled dace, have <br />a much richer diet relative to available food <br />when compared to redside and red shiners. <br />The latter two introduced species may be op- <br />portunistic and appear to eat food items in <br />the proportion that they are available. Feed- <br />ing intensity as determined by percentage <br />fullness indicates that red shiners had a signif- <br />icantly greater percentage of stomach con- <br />tents (62.6 ~ 4.5 %) when compared to all <br />other species except sand shiners (49.4 f <br />8.9 %). Analysis of variance shows that full- <br />ness of all other species did not differ signifi- <br />cantly. Comparing all fish species combined <br />with time (Fig. 5) indicated that fish cap- <br />tured between 1950 and 2140 hours were sig- <br />nificantly fuller (56.2 f 3.6 %) compared to <br />those of the other four time periods (41.7 f <br />2.4 %). This time period corresponded to <br />maximum invertebrate drift (Fig. 4). <br />DISCUSSION <br />An objective of this study was to determine <br />the unique physical and biological features <br />that made Yampa River mile 16.5 attractive <br />to spawning Colorado squawfish. Ideally, the <br />data presented here should have been collect- <br />ed during early July, when spawning fish <br />were observed at the site, but logistical prob- <br />lems prevented this. However, comparative <br />data show similar river conditions between <br />the suspected spawning time of 5 July and <br />this survey period, 24-26 July. During a <br /> <br />Subadults/Adults <br />w/food w/o food <br /> <br />YOY Total fish captured <br /> <br />SA/A <br />Grand <br />total <br />U/o of <br />total <br />CRFP <br />(1982) <br />8 0 1 8 9 307a 4'70 <br />g 0 6 6 12 4% 5% <br />1 0 0 1 1 < 1% 6% <br />36 2 0 38 38 13°Io 1B% <br />40 4 0 44 44 15`70 8'70 <br />69 5 40 74 114 39% 320Io <br />10 2 0 12 12 4°Io 3'70 <br />50 8 2 58 60 20'90 21% <br />0 0 1 0 1 <1°k 2gb <br />
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