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WSP06185
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Entry Properties
Last modified
1/26/2010 2:21:38 PM
Creation date
10/12/2006 1:29:29 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.09B
Description
Glen Canyon Dam/Lake Powell
State
AZ
Basin
Colorado Mainstem
Date
1/1/1994
Title
Comments re: Operation of Glen Canyon Dam Draft Environmental Impact Statement
Water Supply Pro - Doc Type
EIS
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<br />'I <br /> <br />Pg. 112, C. 2, P. 1. Enhancing the trout population may not be <br />needed in the interim since problems in fall 1990 indicate there <br />are already too many trout. Also, no mention is made of a USBR <br />funded study of alternative trout strains which may be better <br />adapted to the unique tailwater habitat. What would a different <br />strain do to reduce the listed impacts? <br /> <br />Pg. 112, C. 2, P. 4. The issue of naturally-spawned fish is ill- <br />defined. A desire on the part of the angler does not necessarily <br />translate to a requirement. Obviously, natural recruitment is not <br />needed to sustain the Lee's Ferry fishery. Why is natural spawning <br />important? <br /> <br />Pg. 113, C. 1, P. 1. We suspect the stranding conditions were less <br />important below Lee's Ferry because anglers could not see stranded <br />fish and thereby become concerned. You have not discussed the <br />importance of stranding about 2,000 fish to a population of 150,000 <br />fish. You should discuss the relative importance of this issue to <br />the trout population and also to the angling public. This may help <br />us to understand why "naturally" spawned fish are important. <br /> <br />~~ <br />t~ <br /> <br />";.; <br /> <br />Pg. 113, C. 1, P. 3. This blue ribbon trout fishery was started <br />with hatchery fish and is sustained by hatchery fish. Naturally <br />spawned fish have contributed little to the Lee's Ferry historic <br />reputation as a blue ribbon fishery. Therefore, to dwell on the <br />importance of spawning to the fishery is not warranted unless you <br />give more reasons than public sentiment. Also, you have not cited <br />any of the Phase II stranding study results in lieu of Maddux et <br />al. Did the Phase II study results support the earlier work? <br />If not, why not? <br /> <br />" <br /> <br />;,' <br /> <br />Pg. 113, C. 2, P. 2. The issue of angler management is not included <br />in this paragraph. If anglers desire it, perhaps a restriction on <br />fishing during spawning season would be supported to help increase <br />natural reproduction. The DEIS should speculate on the possible <br />need to restrict trout impacts on native fish by reducing stocking. <br /> <br />Pg. 114, C. 1, P. 1. In the late '70's, late winter stomach <br />contents of trout were filled with shad. These may have helped <br />produce the big trout but no discussion of this possibility is <br />provided. , These shad may have given the needed pisci vorous diet to <br />help boost the trout to the larger sizes. <br /> <br />Pg. 114, C. 1, P. 2. Availability of Cladophora described in the <br />last sentence may be due to light and turbidity. Again, with an <br />effort to reduce the amount of Cladophora detached, what will <br />happen to this food source for trout in the areas downstream of the <br />LCR? The Bel-Aire strain is likely to be incapable of achieving <br />trophy status (i.e., >22 inches). This was a finding in the Davis <br />trout strain study and should be discussed here. AlSO, Janisch has <br />speculated that many of the poor fish in the slot are simply old <br /> <br />.;; <br /> <br />~I <br />'. <br /> <br />.:~ <br /> <br />;.:.. <br />....f, <br /> <br />25 <br />
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