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Title: Lake Pend Oreille Fishery Recovery Project, 1996-1997 Annual Report.

Abstract

During the winter of 1996-97, the elevation of Lake Pend Oreille was kept 1.2 m higher in an attempt to recover the impacted Kokanee fishery. This was the first winter of the scheduled three-year test. We found that kokanee spawned on the newly inundated gravels provided by the higher water levels. Many of the redds were at depths of 0.5 to 2 m with the highest density of redds at the 1.2 m depth. We also found the numbers of kokanee spawning in tributary streams declined sharply with the higher lake levels. Presumably, these fish spawned on the lakeshore because of the abundance of shoreline gravel rather than migrate up tributary streams. Kokanee spawning sites were mapped around the entire perimeter of the lake. Most spawning occurred at the southern end of the lake; however, kokanee utilized the newly available spawning gravels throughout much of lake's shorelines. Unusually high spring run-off in 1997 produced an inflow to the lake of 4,360 m{sup 3}/s and raised the lake 1 m above full pool. We found that all age-classes of kokanee declined sharply between 1996 and 1997. Survival rates of all age-classes were at or near the lowest point on record. Themore » cause of these declines is unknown; possible causes include kokanee emigrating from the lake and mortality of kokanee due to dissolved gases in the northern third of the lake reaching 120% to 130% of saturation. High dissolved gases were caused by the Cabinet Gorge and Noxon dams on the Clark Fork River. Kokanee population declines caused by flooding would have masked any benefits to the population resulting from a higher winter lake level.« less

Authors:
; ;  [1]
  1. (Idaho Department of Fish and Game, Boise, ID)
Publication Date:
Research Org.:
Bonneville Power Administration, Portland, OR (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
776669
Report Number(s):
DOE/BP-98065-2
Contract 1994BI12917; TRN: AH200114%%47
DOE Contract Number:  
1997BI98065
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
13 HYDRO ENERGY; 54 ENVIRONMENTAL SCIENCES; ABUNDANCE; DAMS; DISSOLVED GASES; LAKES; MORTALITY; PROGRESS REPORT; SATURATION; WATER; KOKANEE SALMON - EFFECT OF WATER LEVELS ON - IDAHO - PEND OREILLE, LAKE.

Citation Formats

Maiolie, Melo A., Harryman, Bill, and Elam, Steve. Lake Pend Oreille Fishery Recovery Project, 1996-1997 Annual Report.. United States: N. p., 1999. Web. doi:10.2172/776669.
Maiolie, Melo A., Harryman, Bill, & Elam, Steve. Lake Pend Oreille Fishery Recovery Project, 1996-1997 Annual Report.. United States. doi:10.2172/776669.
Maiolie, Melo A., Harryman, Bill, and Elam, Steve. Wed . "Lake Pend Oreille Fishery Recovery Project, 1996-1997 Annual Report.". United States. doi:10.2172/776669. https://www.osti.gov/servlets/purl/776669.
@article{osti_776669,
title = {Lake Pend Oreille Fishery Recovery Project, 1996-1997 Annual Report.},
author = {Maiolie, Melo A. and Harryman, Bill and Elam, Steve},
abstractNote = {During the winter of 1996-97, the elevation of Lake Pend Oreille was kept 1.2 m higher in an attempt to recover the impacted Kokanee fishery. This was the first winter of the scheduled three-year test. We found that kokanee spawned on the newly inundated gravels provided by the higher water levels. Many of the redds were at depths of 0.5 to 2 m with the highest density of redds at the 1.2 m depth. We also found the numbers of kokanee spawning in tributary streams declined sharply with the higher lake levels. Presumably, these fish spawned on the lakeshore because of the abundance of shoreline gravel rather than migrate up tributary streams. Kokanee spawning sites were mapped around the entire perimeter of the lake. Most spawning occurred at the southern end of the lake; however, kokanee utilized the newly available spawning gravels throughout much of lake's shorelines. Unusually high spring run-off in 1997 produced an inflow to the lake of 4,360 m{sup 3}/s and raised the lake 1 m above full pool. We found that all age-classes of kokanee declined sharply between 1996 and 1997. Survival rates of all age-classes were at or near the lowest point on record. The cause of these declines is unknown; possible causes include kokanee emigrating from the lake and mortality of kokanee due to dissolved gases in the northern third of the lake reaching 120% to 130% of saturation. High dissolved gases were caused by the Cabinet Gorge and Noxon dams on the Clark Fork River. Kokanee population declines caused by flooding would have masked any benefits to the population resulting from a higher winter lake level.},
doi = {10.2172/776669},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {9}
}

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