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Report: Kootenay Lake North Arm Nutrient Restoration Program 2019-20 Activity Report FLNRORD COL-F20-F-3007-DCA
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If you have any questions on the information presented, or require additional report data or attachments, please contact the Report Contact
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In the North Arm a total of 40.0 MT of phosphorus and 234.4 MT of Nitrogen were added in the form of liquid agricultural grade
fertilizers; In the South Arm, 196 MT of Nitrogen was added. Prepared with financial support from the Fish & Wildlife Compensation Program, on behalf of its program partners BC Hydro, the Province of B.C., Fisheries and Oceans Canada, First Nations and Public Stakeholders.
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Author: Marley Bassett, Steve Arndt and Eva Schindler
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Old Reference Number: COL-F20-F-3007-DCA
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Date Published: Mar 2020
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Report ID: 59018
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Audience: Government and Public
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Kootenay Lake has been influenced by the construction of Duncan Dam in 1967, (which raised the water level in Duncan Lake and flooded the lower Duncan River) and construction of Libby dam in 1973, (creating Koocanusa Reservoir and flooding a large section of the Kootenai River in the US). An invasive species was also introduced to the lake in 1949; Mysis diluviana. The dams have impacted native fish populations by permanently changing the hydrograph and nutrient loading to Kootenay Lake, flooding and/or blocking migration to spawning and rearing habitat and decreasing downstream lake productivity, a process referred to as oligotrophication. Kokanee stocks declined significantly through the 1980s as a result of the decreased productivity. To address the nutrient losses in Kootenay Lake, a bottom-up approach was taken with the addition of nutrients (nitrogen and phosphorus in the form of liquid fertilizer) to increase phytoplankton populations that are suitable for the production of Daphnia, a main food source for kokanee. Nutrients additions have occurred in the North Arm since 1992 and are added from the end of April through early to mid-September. Nutrient additions began (nitrogen only) in the South Arm in 2004.
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Report Type
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Fish and Aquatic Habitat Information |
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Subject
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Fish Species - Kokanee - Oncorhynchus nerka |
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Region - Kootenay |
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Fish and Fish Habitat - Habitat and Stream Assessment |
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Fish and Fish Habitat - Monitoring |
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Fish and Fish Habitat - Restoration |
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Watershed Groups - 300 - Columbia |
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Water Information - Restoration |
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Water Information - Water Quality |
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Program Specific Area - Kootenay Compensation Program |
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