RAMESWARAM: Sri Lankan naval agencies detained 28 Tamil Nadu fishermen on Saturday night on charges of trespassing into the territorial waters of the island nation.Among them, 23 are country boat fishermen from Pamban while five others are mechanized boat fishermen from Rameswaram. Sri Lankan naval agencies also confiscated three country boats and one mechanised boat from them.According to Sri Lankan navy website, the navy assisted Sri Lankan coast guard to detain the fishermen in three different incidents. The three small boats were held in the sea off Thaulpadu while the fishing trawler was held in the seas off the Delft Island.The arrested fishermen and their boats have been handed over to Mannar police station and department of fisheries and aquatic resources at Jaffna.Later in the day, the country boat fishermen were produced before a Mannar court and were remanded in judicial custody till March 21 while the mechanized boat fishermen were produced before a Kytes court and were remanded till March 24.With the detention of these fishermen, the number of Indian fishers in Sri Lankan custody has gone up to 96.