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Last modified
7/14/2009 5:02:30 PM
Creation date
5/22/2009 7:41:23 PM
Metadata
Fields
Template:
UCREFRP
UCREFRP Catalog Number
7384
Author
Tyus, H. M.
Title
Colorado Squawfish.
USFW Year
n.d.
USFW - Doc Type
Vernal, Utah.
Copyright Material
NO
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r <br />8 <br />but main channel temperatures were 19. SC (Tyus et al 1987). This indicate <br />that ambient air temperatures, not river tem erat1ures domina/~tle bac~l~water <br />L(~j,)lv~. .1v~. ~f~ Z 5 ...~ I ~~1.~~ ~2l ~ ~ ~Jc fi a row 5 ~,''~ t' (a w //}} <br />environments. In LLsu1mmary, field /ddata supported the concept of a loss of <br />X11q Y`. ~e•r~7 v..~tc "' <br />recruitment due to floodi-ag, °-a '--- -° ephemeral backwater habitats. <br />l~ ~hnee,~'Zr.~- <br />Temperature may have had an influence, but this was not~the primary factor <br />that limited recruitment during 1983 and 1984. <br />Yampa River- Stream flow needs of rare and endangered fishes, including <br />Colorado squawfish, in the Yampa River were presented by Tyus and Karp (1988). <br />IwL ~t~w! q~l~ (~ ~L~t, <br />We evaluated these fishes by interpreting empi~rical field <br />data, (and resented recommended flow regimens. Main`point~ for Colorado 1 <br />W kt, d~rP..G.~~ 2~ <br />tect flow and temperature regimens for initiation of <br />spring spawnin ~migratfons, and flows, temperature, and sediment transport <br />regimens during the awning period. Based on habitat use and behavior of <br />Colorado squawfish, wA found that high spring flaws, in concert with <br />increasing water temperatures were predictably associated with the initiation, <br />of spawning migration. Decreasing flows in early/mid summer were neeess~,y <br />successful spawn and downstream transport of drifting larvae to nursery <br />habitat in the Green River. The existing winter base flow appeareddadequate <br />for maintenance of winter habitats. <br />We also reviewed outputs of IF IM modelling (Bovee 1982) of Colorado <br />squawfish flow requirements for spawning conducted in 1984 (Archer and Tyus <br />1984, Rose 1984), and for adult and spawning in 1987, for possible use in <br />developing flow recommendations. Recommended flows at which 90X simulated <br />spawning habitat was obtained, varied between 350-1100cfs for egg deposition, <br />25 <br />
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