A fisherman catching shrimps on a fish farm. It is estimated that over 65,000 hectares of Kerala's southern coastal backwaters are under cultivation. India's shrimp industry is a major backbone of the Indian economy. Most farms are natural operations, relying on larvae that flow in from the sea. Farmers concentrate on shellfish production for about six months per year, through the monsoon season when heavy rains freshen the brackish waters and make conditions ideal for catching and raising penaeid prawns.