The arrested fishermen from nearby Thangachimadam, who were lodged in a prison at Vavuniya, were brought to the court in Thalaimannar, where the judge extended their remand.
The five were arrested and their boat impounded when they were fishing near Katchatheevu in the early hours of May 1, said office-bearers of the Fishermen's Association.
They had earlier been produced before a judicial court in that country and remanded till May 15.
On March 26, 12 fishermen from Pudukottai district were arrested by Sri Lankan navy for allegedly fishing in the island nation's territorial waters.
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