Kokanee Impacts Assessment and Monitoring of Lake Pend Oreille and Dworshak Reservoir, Idaho, 1994 Annual Report.

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In an effort to recover the declining kokanee Oncorhynchus nerka kennerlyi population in Lake Pend Oreille, a study was proposed to evaluate the benefits of a higher winter elevation, thus providing more spawning gravel for kokanee. This project was designed to collect and compile baseline information on the kokanee population and potential spawning gravel in Lake Pend Oreille that can be used to help evaluate the effectiveness of future changes in lake level management. We estimated the area of suitable quality spawning gravel at the current winter elevation (625.1 m) and at the proposed winter elevation (626.7 m). Gravels beneath ... continued below

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72 pages

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Fredericks, James P.; Elam, Steve & Maiolie, Melo A. June 1, 1995.

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Description

In an effort to recover the declining kokanee Oncorhynchus nerka kennerlyi population in Lake Pend Oreille, a study was proposed to evaluate the benefits of a higher winter elevation, thus providing more spawning gravel for kokanee. This project was designed to collect and compile baseline information on the kokanee population and potential spawning gravel in Lake Pend Oreille that can be used to help evaluate the effectiveness of future changes in lake level management. We estimated the area of suitable quality spawning gravel at the current winter elevation (625.1 m) and at the proposed winter elevation (626.7 m). Gravels beneath the current winter elevation were generally characterized by a high percentage of fine sediments and a high degree of embeddedness. Of the total gravel available below the proposed elevation of 626.7 m, only 15% was available at current winter elevations. Kokanee population estimates were made with a midwater trawl and hydroacoustic surveys in August and September. September population estimates were 6,760,000 age O, 380,000 age 1 +, 700,000 age 2 +, 990,000 age 3 +, 760,000 age 4 +, and 70,000 age 5 + kokanee. Hydroacoustic surveys run alongside the trawl indicated that hydroacoustics can effectively estimate abundance of kokanee, with the exception of fry, which are too small to be completely distinguishable from opossum shrimp Mysis relicta. Historic estimates of wild kokanee fry indicate that winter elevations higher than 625 m and a stable elevation throughout the winter are positively correlated with kokanee fry abundance and survival.

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72 pages

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OSTI as DE96012891

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  • Other Information: PBD: Jun 1995

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  • Other: DE96012891
  • Report No.: DOE/BP-35167-5
  • Grant Number: 1987BI35167
  • DOI: 10.2172/266882 | External Link
  • Office of Scientific & Technical Information Report Number: 266882
  • Archival Resource Key: ark:/67531/metadc670887

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  • June 1, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Feb. 20, 2017, 1:55 p.m.

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Fredericks, James P.; Elam, Steve & Maiolie, Melo A. Kokanee Impacts Assessment and Monitoring of Lake Pend Oreille and Dworshak Reservoir, Idaho, 1994 Annual Report., report, June 1, 1995; Idaho. (digital.library.unt.edu/ark:/67531/metadc670887/: accessed May 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.