Dr Subbanna Ayyappan, a Padma Shri awardee and architect of India's Blue Revolution, was found dead in the Cauvery River. A veteran in fisheries science, he advanced aquaculture, boosting rural livelihoods. He held key roles in ICAR, NFDB, and DARE, and led institutions like CIFA and CIFE. His work revolutionised India's fishery sector. Police are investigating the mysterious death.