A group of farmers in Karnataka are holding a night-long candle-light vigil to protest against orders to release of Cauvery waters to Tamil Nadu. The protest in Mandya -- near Srirangapatna -- started this morning. Their objection is to the Cauvery Water Regulation Committee's recommendation that Karnataka release 5000 cusecs of water to Tamil Nadu for the 15 days. Independent MLA Darshan Puttanaiah, who is backed by the Congress, has joined the protest.