| ID |
2138 |
| Citation |
J.L. Thorley and I.A. Malcolm (2009) Gerrard Gravels Groundwater Preliminary Assessment, Poisson Consulting Ltd. Prepared for Fish and Wildlife Compensation Program - Columbia Basin. |
| Organization |
Fish and Wildlife Compensation Program - Columbia Basin |
| URL |
http://biodiversityatlas.org/reports/details.php?reportID=511&searchterms= |
| Abstract/Description or Keywords |
The majority of the Gerrard rainbow trout of Kootenay Lake spawn in a 500 m section of the Lardeau River at the outflow of Trout Lake. Relatively little is known about the proportion of the eggs that survive to emergence although an egg survival study suggested that poorly oxygenated groundwater might be having lethal effects on the eggs in at least one area. Piezometers were used to extract hyporheic water from two of the main spawning sites. The DO levels at the site with high egg mortality (SD) may be low enough at some locations 20_40 cm below the surface to kill salmonid eggs. The intra_gravel water quality at the other site (SE) was consistently high. The electrical conductivity and temperature data indicate that groundwater influx is likely responsible for the lower oxygen levels at site SD. Further work is needed to determine the spatial and temporal distribution of dissolved oxygen levels and the resultant egg survival rates. |
| Information Type |
Report |
| Regional Watershed |
Kootenay Lake |
| Sub-watershed if known |
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| Aquifer # |
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| Comments |
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| Project status |
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| Contact Name |
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| Contact Email |
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