Abstract
In this study, we discuss about the impacts on fish of sediment flushing from dams by points of turbid water. The aims of this study are to make a model for evaluation for the impacts of the increase of suspended solids concentration on Char (Salvelinus leucomaenis) and to check the feature of the model. Firstly, we haveexamined the variations of concentrations of dissolved oxygen and suspended solids of the three sites where sediment flushes were done. Secondly, we have made the model. We have thought that if suspended solidsconcentration increased, the uptake volume of oxygen by fish decreased by the adhesion of the sediment on the gills. By using the model, if we know the time variation of concentrations of suspended solids and dissolved oxygen, we can calculate the time variation of the rate of dead fish or fish in asphyxia and the adhesion area of sediment on the gills, and can evaluate no impact time on chars, and have found that if dissolved oxygen concentration decreased, more chars died earlier.
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