Quantification of Libby Reservoir Water Levels Needed to Maintain or Enhance Reservoir Fisheries, 1983 Final Report.

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Description

The first six months of the fishery investigations in Libby Reservoir were aimed at developing suitable methodology for sampling physical-chemical limnology, fish food availability, fish food habits, and seasonal distribution and abundance of fish populations. Appropriate methods have been developed for all aspects with minor modification of original proposed methodologies. Purse seining has yet to be tested. Physical-chemical limnologic sampling could be reduced or subcontracted with the U.S. Geologic Survey to allow for more intensive sampling of fish food or fish distribution portions of the investigation. Final sample design will be determined during 1983-84. Future directions of the study revolve ... continued below

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67 pages

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Shepard, Bradley B. July 1, 1984.

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Description

The first six months of the fishery investigations in Libby Reservoir were aimed at developing suitable methodology for sampling physical-chemical limnology, fish food availability, fish food habits, and seasonal distribution and abundance of fish populations. Appropriate methods have been developed for all aspects with minor modification of original proposed methodologies. Purse seining has yet to be tested. Physical-chemical limnologic sampling could be reduced or subcontracted with the U.S. Geologic Survey to allow for more intensive sampling of fish food or fish distribution portions of the investigation. Final sample design will be determined during 1983-84. Future directions of the study revolve around two central issues, the potential for flexibility in reservoir operation and determination of how reservoir operation affects fish populations. Simulated maximum drawdown levels during a 40-year period were controlled by power in seven out of eight years. Drawdowns were generally within 10 feet of the flood control rule curve, however. There may be more flexibility with regards to timing of refill and evacuation. This aspect needs to be evaluated further. Production and availability of fish food, suitability of reservoir habitat, and accessibility of off-reservoir spawning and rearing habitat were identified as components of fish ecology which reservoir operation could potentially impact. Two models based on trophic dynamics and habitat suitabilities were suggested as a framework for exploring the relationship of reservoir operation on the fish community.

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67 pages

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  • Report No.: DOE/BP-296
  • Grant Number: 1983BP12660
  • DOI: 10.2172/913265 | External Link
  • Office of Scientific & Technical Information Report Number: 913265
  • Archival Resource Key: ark:/67531/metadc884364

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  • July 1, 1984

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  • Sept. 22, 2016, 2:13 a.m.

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Shepard, Bradley B. Quantification of Libby Reservoir Water Levels Needed to Maintain or Enhance Reservoir Fisheries, 1983 Final Report., report, July 1, 1984; United States. (digital.library.unt.edu/ark:/67531/metadc884364/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.