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WSP03464
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Last modified
1/26/2010 12:50:32 PM
Creation date
10/11/2006 11:45:12 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8240.300.31.J
Description
San Juan River - Environmental Studies
Basin
San Juan/Dolores
Water Division
7
Date
5/12/1995
Title
Biological Evaluation of a Proposal to Stock Non-Native Fishes into Ponds within the 0- to 50-year Floodplain of the Upper Colorado River Basin in Critical Habitat of Endangered Fishes
Water Supply Pro - Doc Type
Report/Study
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<br />5 <br /> <br />"0 <br />(~) <br />(,-.j <br />1\) <br /> <br />--.J <br /> <br />floodplain ponds seems a minor part in the overall impact to <br />the native, endangered fishes. Time, effort, and funds for <br />the recovery of Colorado squawfish, razorback sucker, <br />humpback chub, and bony tail chub could be better spent <br />controlling channel catfish, green sunfish, red shiners, <br />common carp and the other, more damaging nonnative fishes, <br /> <br />We realize that the history of stocking and managing game <br />fishes outside of their native ranges involves every state in the <br />U,S., and many countries in the world, over the past 300 years. <br />These efforts are conducted to improve angling opportunities, and <br />have long been supported by the public. In fact, almost all of <br />the modern methods and techniques of fisheries biology originate <br />from hatcheries and management of game fishes. Under current <br />attitudes and economics, protection of non-game fishes must be <br />integrated with the angling needs of the public if protection of <br />native fishes and biodiversity are to succeed. Therefore, we <br />have critiqued the proposal to stock largemouth bass, bluegill, <br />and black crappie in ponds within the floodplain of the Colorado <br />River. If our recommendations are followed, we see a possible <br />window of opportunity to benefit endangered fishes in the Upper <br />Colorado River. Eradication of nonnative, non-salmonid fishes <br />from the "0-10 ponds" could eliminate many of the detrimental <br />fishes that are unable to maintain a self-sustaining population <br />in the mainstream, and are constantly stocked from these off- <br />stream ponds, either through flooding or via connecting channels. <br /> <br />The remainder of our comments s1..'ggest l1>odifications and <br />cdditions to the March 6, 1995 proposal. <br /> <br />3. After implemencation of the reclamation and stocking <br />program, collections of fishes from the mainstream Colorado <br />River should be made annually for a 10 year period and <br />compared to species composition and abundance in collections <br />from 1979 to present. Evaluation after the 10 year period <br />should consider an increase in the native species and a <br />decrease in nonnative fishes as a success, No increase in <br />numbers of largemouth bass, bluegill, or black crappie in <br />the mainstream should be considered "no impact" to the <br />endangered fishes, but an increase in any of these species <br />or a shift to more detrimental nonnative fishes should be <br />judged as a failure in the reclamation and recovery effort <br />and the entire floodplain stocking proposal be re-evaluated. <br /> <br />4. Stocking of salmonids in the "0-10 ponds" should not impact <br />endangered fishes in the mainstream. However, we suggest <br />that young razorback suckers also be considered for stocking <br />in these ponds as grow-out facilities, either with the <br />salmonids or in ponds without other fishes. There may be <br />some predation on the young razorback suckers by the <br />salmonids, but many suckers will survive, grow, and be <br />
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