The fishermen were produced before a magistrate at his residence in Jaffna and were remanded in custody, P Sesuraja and S Emiret, leaders of Rameswaram Fishermen's Association, said.
The fishermen, 13 of them hailing from Rameswaram and others from Jagadapattinam in Pudukottai district, were sent to a Jaffna prison later, they said.
All the fishermen were arrested near Neduntheevu yesterday, and their three boats were taken to Kanagesanthurai in Sri Lanka by the navy personnel.
In a letter to Prime Minister Narendra Modi yesterday, he sought his intervention for the immediate immediate release of 51 fishermen, including those arrested in the latest incident, besides 114 fishing boats seized by the Lankan Navy.