Toxicity of distillery wastes to <i>Puntius sophore</i> (HAM.) and <i>Mystus Vittatus</i> (BLOCH) (Pisces, Cyprinidae, Bagridae) Part 3: Bioassay studies and <i>TL_m</i> determination

Abstract

Abstract The toxicity of the distillation wastes with low acidity, high turbidity and high organic load to the two fish species is tested by a laboratory test. The threshold value of toxicity is found at a 4 or 7 per cent dilution of wastewater. The statistical analysis of the survival rates has shown that the survival rates are significantly dependent on concentration and the time of exposure, for Puntius sophore also on temperature within the range of 20…34°C. Mystus vittatus proves to be the significantly more resistant species. The maximum permissible concentration of waste in the water ist calculated, too.