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Last modified
7/14/2009 5:02:34 PM
Creation date
5/24/2009 7:15:36 AM
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UCREFRP
UCREFRP Catalog Number
8291
Author
Chart, T. E. and L. D. Lentsch.
Title
Flow Effects on Humpback Chub (Gila Cypha) Populations in Westwater Canyon.
USFW Year
1997.
USFW - Doc Type
Aspinal-46,
Copyright Material
NO
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Colorado River Ftow: '92 -'96 <br />50000 State Line Gage (USGS No. 09163500) <br />40000 _._..... _ ..._.___..._..._.___..._._._ ._._..._.._____. <br />N <br />LL <br />V <br />~ 30000 ._.._._......._..._..._..~ .-.._...._----:_....._________...._... __-._____._.__. <br />m <br />LL 20000 --- -•- <br />.o <br />V <br />10000 - <br />JAN, ~2 JAN,'83 JAN,'84 JAN,'86 JAN,'86 <br />Figure 2. Mean daily flow (cubic feet per second) as recorded by the United State Geological <br />Survey at the Colorado River Near Colorado-Utah State Line (State Line) gage. Gage No. <br />09163500: January 1, 1992 -September 30, 1996. <br />METHODS <br />:, <br />Young of the year <br />The study area was divided into three sub-reaches for comparative analysis of YOY catch and <br />habitat data: above canyon (RM 127.5 -124.6); canyon (RM 124.4 -119), and below canyon <br />(RM 116 -110). In 1992, low velocity habitats were sampled on four occasions in conjunction <br />with the fish community sampling. Beginning in 1993, fish community sampling was reduced to <br />twice annually and specific YOY sampling trips were added to better determine time of hatch, <br />YOY densities, growth, and habitat relationships. Larval and young of the year fish were <br />collected with a beach seine (4.6m; 1.Smm mesh) or a smaller one-man seine (lm; 0.8mm mesh). <br />Larval drift nets (fished passively and towed through main channel habitats), larval dip nets, and <br />larval light traps were used throughout the study, but did not prove effective. An effort was made <br />DRAFT <br />5 <br />
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