The rivers have been dammed for hydroelectric and irrigation purposes with major reservoirs spread across the states. The reservoirs are important for their commercial and sport fisheries of rainbow trout, mahseer and common carp. There are about 50 major dams along the length of the Western Ghats. Most notable of these projects are the Koyna in Maharashtra, Linganmakki and krishna Raja Sagara in Karnataka, Mettur and Pykara in Tamil Nadu, Parambikulam, Malampuzha and Idukki in Kerala.