The Sri Lankan Navy in a statement said the arrests occurred during a special operation in the sea area north of Mannar.
The released fishermen were handed over to Indian authorities at the Wagah Border near here.
The fishermen were arrested from the North Sea near Delft Islands during a search operation conducted Saturday night, news portal The News First reported
Sri Lankan Navy detains 12 Indian fishermen and seizes their trawlers on allegations of poaching in the island nation's waters, according to an official statement on Sunday.
The European Union said on Wednesday it was taking steps to help resolve a dispute between Italy and India after two Italian marines were detained for shooting two Indian fisherman they believed to be pirates.