Lake Roosevelt Fisheries Evaluation Program; Evaluation of Limiting Factors for Stocked Kokanee and Rainbow Trout in Lake Roosevelt, Washington, 1999 Annual Report.
Hatchery supplementation of kokanee Oncorhynchus nerka and rainbow trout O. mykiss has been the primary mitigation provided by Bonneville Power Administration for loss of anadromous fish to the waters above Grand Coulee Dam (GCD). The hatchery program for rainbow trout has consistently met managemen...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Report |
Language: | English |
Published: |
United States. Bonneville Power Administration.
2009
|
Subjects: | |
Online Access: | https://doi.org/10.2172/961900 https://digital.library.unt.edu/ark:/67531/metadc930394/ |
id |
ftunivnotexas:info:ark/67531/metadc930394 |
---|---|
record_format |
openpolar |
spelling |
ftunivnotexas:info:ark/67531/metadc930394 2023-05-15T15:47:19+02:00 Lake Roosevelt Fisheries Evaluation Program; Evaluation of Limiting Factors for Stocked Kokanee and Rainbow Trout in Lake Roosevelt, Washington, 1999 Annual Report. Baldwin, Casey Polacek, Matt United States. Department of Energy. 2009-03-01 120 pages Text https://doi.org/10.2172/961900 https://digital.library.unt.edu/ark:/67531/metadc930394/ English eng United States. Bonneville Power Administration. rep-no: DOE/BP-32148-9 doi:10.2172/961900 osti: 961900 https://digital.library.unt.edu/ark:/67531/metadc930394/ ark: ark:/67531/metadc930394 Management Abundance Productivity Oxygen Zooplankton Food Mitigation Lakes Mortality Entrainment Fisheries Seasons Fishes Dissolved Gases 13 Hydro Energy Distribution Trout Evaluation Daphnia Report 2009 ftunivnotexas https://doi.org/10.2172/961900 2019-05-18T22:08:18Z Hatchery supplementation of kokanee Oncorhynchus nerka and rainbow trout O. mykiss has been the primary mitigation provided by Bonneville Power Administration for loss of anadromous fish to the waters above Grand Coulee Dam (GCD). The hatchery program for rainbow trout has consistently met management goals and provided a substantial contribution to the fishery; however, spawner returns and creel survey results for kokanee have been below management goals. Our objective was to identify factors that limit limnetic fish production in Lake Roosevelt by evaluating abiotic conditions, food limitations, piscivory, and entrainment. Dissolved oxygen concentration was adequate throughout most of the year; however, levels dropped to near 6 mg/L in late July. For kokanee, warm water temperatures during mid-late summer limited their nocturnal distribution to 80-100 m in the lower section of the reservoir. Kokanee spawner length was consistently several centimeters longer than in other Pacific Northwest systems, and the relative weights of rainbow trout and large kokanee were comparable to national averages. Large bodied daphnia (> 1.7 mm) were present in the zooplankton community during all seasons indicating that top down effects were not limiting secondary productivity. Walleye Stizostedion vitreum were the primary piscivore of salmonids in 1998 and 1999. Burbot Lota lota smallmouth bass Micropterus dolomieui, and northern pikeminnow Ptychocheilus oregonensis preyed on salmonids to a lesser degree. Age 3 and 4 walleye were responsible for the majority (65%) of the total walleye consumption of salmonids. Bioenergetics modeling indicated that reservoir wide consumption by walleye could account for a 31-39% loss of stocked kokanee but only 6-12% of rainbow trout. Size at release was the primary reason for differential mortality rates due to predation. Entrainment ranged from 2% to 16% of the monthly abundance estimates of limnetic fish, and could account for 30% of total mortality of limnetic fishes, depending on the contribution of littoral zone fishes. Inflow to GCD forebay showed the strongest negative relationship with entrainment whereas reservoir elevation and fish vertical distribution had no direct relationship with entrainment. Our results indicate that kokanee and rainbow trout in Lake Roosevelt were limited by top down impacts including predation and entrainment, whereas bottom up effects and abiotic conditions were not limiting. Report Burbot Lota lota lota University of North Texas: UNT Digital Library Pacific |
institution |
Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Management Abundance Productivity Oxygen Zooplankton Food Mitigation Lakes Mortality Entrainment Fisheries Seasons Fishes Dissolved Gases 13 Hydro Energy Distribution Trout Evaluation Daphnia |
spellingShingle |
Management Abundance Productivity Oxygen Zooplankton Food Mitigation Lakes Mortality Entrainment Fisheries Seasons Fishes Dissolved Gases 13 Hydro Energy Distribution Trout Evaluation Daphnia Baldwin, Casey Polacek, Matt Lake Roosevelt Fisheries Evaluation Program; Evaluation of Limiting Factors for Stocked Kokanee and Rainbow Trout in Lake Roosevelt, Washington, 1999 Annual Report. |
topic_facet |
Management Abundance Productivity Oxygen Zooplankton Food Mitigation Lakes Mortality Entrainment Fisheries Seasons Fishes Dissolved Gases 13 Hydro Energy Distribution Trout Evaluation Daphnia |
description |
Hatchery supplementation of kokanee Oncorhynchus nerka and rainbow trout O. mykiss has been the primary mitigation provided by Bonneville Power Administration for loss of anadromous fish to the waters above Grand Coulee Dam (GCD). The hatchery program for rainbow trout has consistently met management goals and provided a substantial contribution to the fishery; however, spawner returns and creel survey results for kokanee have been below management goals. Our objective was to identify factors that limit limnetic fish production in Lake Roosevelt by evaluating abiotic conditions, food limitations, piscivory, and entrainment. Dissolved oxygen concentration was adequate throughout most of the year; however, levels dropped to near 6 mg/L in late July. For kokanee, warm water temperatures during mid-late summer limited their nocturnal distribution to 80-100 m in the lower section of the reservoir. Kokanee spawner length was consistently several centimeters longer than in other Pacific Northwest systems, and the relative weights of rainbow trout and large kokanee were comparable to national averages. Large bodied daphnia (> 1.7 mm) were present in the zooplankton community during all seasons indicating that top down effects were not limiting secondary productivity. Walleye Stizostedion vitreum were the primary piscivore of salmonids in 1998 and 1999. Burbot Lota lota smallmouth bass Micropterus dolomieui, and northern pikeminnow Ptychocheilus oregonensis preyed on salmonids to a lesser degree. Age 3 and 4 walleye were responsible for the majority (65%) of the total walleye consumption of salmonids. Bioenergetics modeling indicated that reservoir wide consumption by walleye could account for a 31-39% loss of stocked kokanee but only 6-12% of rainbow trout. Size at release was the primary reason for differential mortality rates due to predation. Entrainment ranged from 2% to 16% of the monthly abundance estimates of limnetic fish, and could account for 30% of total mortality of limnetic fishes, depending on the contribution of littoral zone fishes. Inflow to GCD forebay showed the strongest negative relationship with entrainment whereas reservoir elevation and fish vertical distribution had no direct relationship with entrainment. Our results indicate that kokanee and rainbow trout in Lake Roosevelt were limited by top down impacts including predation and entrainment, whereas bottom up effects and abiotic conditions were not limiting. |
author2 |
United States. Department of Energy. |
format |
Report |
author |
Baldwin, Casey Polacek, Matt |
author_facet |
Baldwin, Casey Polacek, Matt |
author_sort |
Baldwin, Casey |
title |
Lake Roosevelt Fisheries Evaluation Program; Evaluation of Limiting Factors for Stocked Kokanee and Rainbow Trout in Lake Roosevelt, Washington, 1999 Annual Report. |
title_short |
Lake Roosevelt Fisheries Evaluation Program; Evaluation of Limiting Factors for Stocked Kokanee and Rainbow Trout in Lake Roosevelt, Washington, 1999 Annual Report. |
title_full |
Lake Roosevelt Fisheries Evaluation Program; Evaluation of Limiting Factors for Stocked Kokanee and Rainbow Trout in Lake Roosevelt, Washington, 1999 Annual Report. |
title_fullStr |
Lake Roosevelt Fisheries Evaluation Program; Evaluation of Limiting Factors for Stocked Kokanee and Rainbow Trout in Lake Roosevelt, Washington, 1999 Annual Report. |
title_full_unstemmed |
Lake Roosevelt Fisheries Evaluation Program; Evaluation of Limiting Factors for Stocked Kokanee and Rainbow Trout in Lake Roosevelt, Washington, 1999 Annual Report. |
title_sort |
lake roosevelt fisheries evaluation program; evaluation of limiting factors for stocked kokanee and rainbow trout in lake roosevelt, washington, 1999 annual report. |
publisher |
United States. Bonneville Power Administration. |
publishDate |
2009 |
url |
https://doi.org/10.2172/961900 https://digital.library.unt.edu/ark:/67531/metadc930394/ |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Burbot Lota lota lota |
genre_facet |
Burbot Lota lota lota |
op_relation |
rep-no: DOE/BP-32148-9 doi:10.2172/961900 osti: 961900 https://digital.library.unt.edu/ark:/67531/metadc930394/ ark: ark:/67531/metadc930394 |
op_doi |
https://doi.org/10.2172/961900 |
_version_ |
1766382103078895616 |