The police said according to the information received by them, the Lankan naval men arrested the fishermen from Pamban near here for poaching in their waters and also seized their boat.
They would be produced before the Mannar judicial magistrate court and remanded to judicial custody, they said.
In another incident, seven fishermen from Tuticorin district, who were allegedly smuggling ration items to Andaman and Nicobar islands were rescued by the Lankan fishermen, after their boat developed a snag and capsized off Jaffna early this morning, the police said.
It was not known whether they would be arrested or released by the Sri Lankan authorities, they said.