Dissolved oxygen conditions and fish requirements in the Athabasca, Peace and Slave Rivers : assessment of present conditions and future trends / by P.A. Chambers and T. Mill.: R71-49/4-5E-PDF

"This report addresses the Northern River Basins Study (NRBS) question: “What concentrations of dissolved oxygen are required seasonally to protect the various life stages of fish, and what factors control dissolved oxygen (DO) in the rivers?” Concern about DO conditions in the Northern Rivers focuses on the ice-covered period when only limited reaeration occurs to replenish any oxygen consumed by oxygen-consuming effluent, river biota and naturally occurring chemical processes. During the remainder of the year, oxygen from the air is incorporated the river water and offsets any losses of oxygen. The report synthesizes results from monitoring, research and modelling studies undertaken as part of the NRBS to characterize loading from all point sources in the Northern River basins, evaluate the impacts of oxygen consuming waste on river chemistry, develop models for predicting DO concentrations in the Athabasca River, assess the response of riverine biota to low DO levels, and investigate interactions between low DO levels and nutrients and contaminants in pulp mill effluent on benthic organisms. These findings are used to assess the state of aquatic ecosystem health, and develop scientific and management recommendations for the Northern River basin"--Summary.

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