CMFRI officials said 400 blocks of artificial reef are being submerged at five places off Nagapattinam coast - Seruthur, Pattinachery, Vellapallam, Chinnagudi and Perumalpettai.
"The reefs are being submerged about three knots off the coast at a total cost of Rs 3.4 crore. They are being transported through barges from Nagapattinam port and operations will be completed in a couple of days," officials said.
Coral reefs play a vital role in fish production. However, due to various reasons, including climate change and pollution, coral reefs have depleted worldwide.