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Last modified
7/14/2009 5:02:34 PM
Creation date
5/18/2009 12:28:51 AM
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UCREFRP
UCREFRP Catalog Number
9328
Author
Miller, W. H.
Title
Analysis of Salmon and Steelhead Supplementation.
USFW Year
1990.
USFW - Doc Type
\
Copyright Material
NO
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Table 3. Numbers of anadromous salmonids released in Washington in 1987. <br />Winter <br />Steelhead <br />1,803,646 <br />Steelhead <br />Summer <br />Steelhea <br />3,349,917 <br />Fall <br />hinook <br />139,359,630 <br />Spring. <br />Chinook <br />17,896,634 <br />Coho <br />88,363,656 <br />Chum <br />90,171,973 <br />The Washington Department of Wildlife (WDW) manages the steelhead runs in <br />Washington. The WDW raises smolts almost exclusively and more than 6 million are <br />released annually. This stocking effort is mainly to increase harvestable numbers, not to <br />rebuild natural or wild runs. The operational procedures of WDW hatcheries have <br />created a separation between the run timing of hatchery produced winter steelhead and <br />naturally produced winter steelhead. They are presently managed as separate runs. The <br />early run consists primarily of domesticated hatchery stocks and the later run primarily <br />wild stock. <br />While wild steelhead broodstock are not normally used in WDW hatchery programs, <br />some winter steelhead programs do utilize wild/natural fish. Some examples include <br />ongoing programs on the Wynoochee and Skookumchuck Rivers (tributaries to the <br />Chehalis system), the Nooksack River in northeastern Puget Sound and the Soleduck <br />River on the north coast. Recently, wild/natural broodstock have also been used on the <br />Humptulips, Satsop and Sauk Rivers. These programs have been a mixture of true <br />supplementation and harvest augmentation. Unfortunately, the supplementation <br />programs were not rigorously evaluated. The contribution of the hatchery <br />supplementation to the overall return and especially to the spawning escapement was not <br />determined. In areas where wild stock was not incorporated, the intent was to separate <br />wild and hatchery fish. <br />Escapement data for wild summer steelhead is less detailed although the Toutle, Wind <br />and Wenatchee systems have shown favorable responses. <br />Many WDW biologists believe that wild winter stocks are responding favorably to the <br />current management practices. In the Kalama River, 58 percent of the total winter <br />steelhead run consists of wild fish. The Elwha River, which is completely blocked by the <br />Elwha Dam at River mile 5.3, averages only 14 percent wild -fish in the total .run. <br />9 <br />
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