Jayalalithaa said she had "hoped" that after the change of regime in Sri Lanka, with Maithiripala Sirisena heading the government, there would be a positive change in the "hostile environment" created for fishermen from coastal districts of her state while fishing in their traditional fishing waters.
She had hoped that "the aggressive actions of the Sri Lankan Navy would cease," she told Prime Minister Narendra Modi in a letter to draw his attention to the latest instance of arrest of 24 Indian fishermen yesterday.
New Delhi had not taken any concrete action on this matter, she added.
"Despite my taking up the issue repeatedly with you, there has been no concrete action and our fishermen are suffering prolonged incarceration in Sri Lankan jails," she said.
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This is an unacceptable situation which has to be remedied through a set of comprehensive measures including securing the urgent release of the fishermen, she said.
Harassment and frequent arrests of Tamil Nadu fishermen were "abrogation of their traditional fishing rights in their traditional fishing areas," she said.
This issue needs to be placed at the top of the agenda in any interaction with Sri Lanka, she said and called for "concerted action" from the Centre to secure the immediate release of a total of 78 fishermen and 38 fishing boats presently in Lankan custody.
The CM reiterated that the agreements of 1974 and 1976, whereby India had ceded the iselt Katchatheevu to Sri Lanka, should be nullified as a long-term solution to the issue.
She also reminded Modi of her demand for a Rs 1,520 crore package for the fishing sector in her state.