Yakima River Species Interactions Studies Annual Report: 1992

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The Yakima Species Interactions Study (YSIS) was begun in September of 1989 to investigate species interactions among fish in response to proposed supplementation of salmon and steelhead in the Yakima Basin. Supplementation is defined as ''the use of artificial propagation in the attempt to maintain or increase natural production while maintaining the long term fitness of the target population, and keeping the ecological and genetic impacts on non-target populations within specified biological limits'' (BPA summary report series, 1992). Target populations are the populations of fish that will be supplemented and non-target populations are all other populations of fish. One of … continued below

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107 pages

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Pearsons, Todd N. August 1993.

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The Yakima Species Interactions Study (YSIS) was begun in September of 1989 to investigate species interactions among fish in response to proposed supplementation of salmon and steelhead in the Yakima Basin. Supplementation is defined as ''the use of artificial propagation in the attempt to maintain or increase natural production while maintaining the long term fitness of the target population, and keeping the ecological and genetic impacts on non-target populations within specified biological limits'' (BPA summary report series, 1992). Target populations are the populations of fish that will be supplemented and non-target populations are all other populations of fish. One of the goals of the proposed Yakima Fisheries Project (YFP) is to test the strategy of supplementation in the Yakima Basin. In a review of published literature and unpublished projects about supplementation, Miller et al. (1990) concluded ''Adverse impacts to wild stocks have been shown or postulated for about every type of hatchery fish introduction where the intent was to rebuild runs''. In Steward and Bjornn's (1990) review of the published literature, they stated that ''Genetic and ecological effects, and changes in productivity of the native stocks that can result from supplementation remain largely unmeasured''. Uncertainties about the effects supplementation in the upper Yakima basin may have on wild fish was the impetus for the initiation of the present studies. The YSIS has three main goals which are to: evaluate risks of ecological interactions to target and non-target populations (resolve critical uncertainties), contribute to the development of an interactions monitoring plan, and provide information that may be used to increase the probability that natural production of anadromous salmonids may be successfully increased. Information obtained will be used as the YFP planning process proceeds (adaptive management). A monitoring plan is being developed which will incorporate data collected both before and after implementation of the YFP. Monitoring enables managers to identify undesirable impacts, use new knowledge to adjust supplementation protocols, and gauge the extent to which supplementation is meeting performance objectives. This annual report summarizes data for the period between January 1, and December 31, 1992. Data collected during 1992 was compared to findings from previous years to identify general trends and make preliminary comparisons. For the purpose of this report, statistical analyses were not emphasized. Except where otherwise noted, the methods and general site descriptions were the same as described in previous reports (Hindman et al. 1991, McMichael et al. 1992). It is important to note that this report describes work in progress. Readers are cautioned that any preliminary conclusions are subject to future revision as more data and analyses are available.

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107 pages

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  • August 1993

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  • Sept. 27, 2016, 1:39 a.m.

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Pearsons, Todd N. Yakima River Species Interactions Studies Annual Report: 1992, report, August 1993; Washington. (https://digital.library.unt.edu/ark:/67531/metadc899688/: accessed May 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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