What are the ill effects of biomagnification? How can we control water pollution?

Explanation

Ill effect of biomagnification. Higher amounts of pesticide disturb calcium metabolism of birds resulting in thinning of egg shells and their premature breaking that kills the embryos. Other disorders are cerebral haemorrhage, softening of brain, liver cirrhosis, hypertension and malfunctioning of sex hormones. Population of Bald Eagle had declined due to it. Consequently use of persistent pesticides has been banned in agriculture.
Recently microorganisms capable of metabolising chlorinated hydrocarbons have been discovered. They possess enzyme dehalogenase