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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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In Tutka Bay, Boyle and Dudiak (1986) recorded survival -rates of hatchery released pink <br />salmon fry at 12.5 percent for fed fry and. 14.5 percent for unfed fry. Most other releases <br />have shown a higher return for fed fry. Lower rates near 1-3 percent for unfed fry .are <br />common for both pink and churn fry releases (Kohler 1984; McDaniel et al. 1984). <br />Feeding fry a few weeks and releasing with plankton peaks contribute to higher survival. <br />Survival as high as 14 percent were seen, with several groups- returning at 8 percent. <br />Summary <br />Supplementation in Alaska is primarily what we have classified as harvest augmentation. <br />Their management scheme is to -manage for wild .stock escapement and use <br />supplementation to increase salmon runs. for commercial fisheries. In a few cases, <br />natural sockeye stocks have been rebuilt. Most of the impetus for this rebuilding was for <br />harvest. <br />Separating hatchery stocks from wild stocks has occurred by bringing salmon back to <br />areas where no natural population exist and by separating time of run return. <br />Ideas that apply to supplementation in the Columbia River Basin include: (a) streamside <br />spawning and incubation units, Kiotoi boxes, and outplanting of fry, (b) lake fertilization <br />and fry planting schemes for sockeye, (c) separating hatchery stocks from wild stocks by <br />place and time of return, and (d) managing for wild stock escapement with hatcheries <br />keyed to harvest augmentation. <br />British Columbia <br />Background <br />British Columbia (BC) probably comes closer to true supplementation than any area in <br />the Northwest. Their Fraser River Basin is similar to our Columbia River Basin. <br />However, BC does not have as many dams and associated fish passage problems. BC's <br />Salmonid Enhancement Program (SEP) began in 1977 to double their salmonid <br />production. SEP's responsibilities are divided between two agencies. The Federal <br />Department of Fisheries and Oceans manages the five species of Pacific salmon. <br />Steelhead and cutthroat trout are managed by the Provincial Ministry of the <br />Environment. <br />SEP supplements natural production by the most natural means and thereby reduces <br />cost. Currently SEP has a moratorium on new hatchery construction. They concentrate <br />primarily on using existing hatcheries to incubate gametes from indigenous broodstock. <br />They employ streamside upwelling incubation units and groundwater fed side channels to <br />produce rearing habitat. They also utilize spawning channels to extend the amount of <br />spawning area available. These channels are of particular value for sockeye, pink, and <br />26 <br />
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