This paper deals with the responses of the Brown Trout (Salmo Trutta Linn.), to free chlorine residuals in freshwater, and the potential toxicity that sometimes results when waste water containing free chlorine residuals, is discharged from sewerage and water treatment plants, into a receiving river or stream
Hatchery reared yearling brown trout were killed experimentally by exposure for 1 hour to free chlorine residuals, at levels as low as 0.04 mg/l, and to continuously maintained free chlorine residuals at levels as low as 0.01 mg/l. At 0.01 mg/l free chlorine in water, 50% of the test fish dies in 43.5 hours. The implications of the discharge of chlorinated waste water and sewerage into freshwater fisheries is discussed.
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