Although there is limited long-term data, Figure Eight Lake results indicate that sequential treatments result in suppression of sediment phosphorus release. Many reservoir tailwaters contain valuable cold water fisheries. In some cases the fish may be further compressed by warm water above into a narrow band in the thermocline. At some time during the summer there may be no place in the lake with suitable living conditions for cold-water fish. Algal biomass, species composition, and rates of production can all be affected by aeration techniques.
Many deep lakes situated in the prairie provinces are eutrophic.
The south basin was not treated and served, along with 7 yrs of background data, as the control. In contrast, the rates in the untreated south basin remained near or above pretreatment rates. Full scale systems were installed in the last two lakes, and the results were promising. References Ashley, K.I. 1988. Hypolimnetic aeration research in British Columbia.