Nine fishermen of Nagapattinam district were arrested by the Sri Lankan Navy when they were fishing mid-sea on Wednesday.
The fishermen had set sail from Nagapattinam in a mechanised boat on October 11, Fisheries Department officials said.
Information regarding the arrest was received by the Fisheries Department on Wednesday morning, a senior official said.
This is the fourth time in the recent past that Nagapattinam fishermen have been arrested by the Sri Lankan Navy.
A few days ago, 19 fishermen of Nagapattinam district were arrested by the Sir Lankan Navy. Prior to that, 15 fishermen were arrested and nine others were arrested days earlier.