Patra is absolutely right.

Traditional fishing practises are vanishing at an alarming pace. One more dangerous fishing practise is dynamite fishing.

Many south Indian rivers are now deprived of famous fish species like Masheer mainly due to unscruplous fishing and pollution. The black carp - once abundant in the river Cauvery is now no where. The carnatic carp is endangered. Blue finned masher once abundant in hill rivers are now confined to few areas. In Parambikulam, unscruplous dynamite fishing is rampant and the masheer survival is jeopardized.

Further, in many reservoirs exotic fish species are introduced for commercial benefits. These alien fish species thrive at the cost of native species. Many reservoirs including the famous Bhavani sagar reservoir is rearing alien fishes putting at risk the survival of endemic fish species..

Every where man has altered nature's chemistry adversely.