Taking up the matter with Prime Minister Narendra Modi, Chief Minister E K Palaniswami, in a letter, said the state government was "extremely" concerned over such incidents and sought Centre's intervention into the matter.
Such incidents of the arrest of "our fishermen by the Sri Lankan Navy (should) be taken up strongly at the highest diplomatic level to ensure the safety and security of our fishermen in the Palk Bay," he said.
"The Government of Tamil Nadu is extremely concerned about the continuing apprehension and detention of our fishermen and their boats," Palaniswami said.
At present, 48 fishermen and 122 fishing boats, including those detained today, were under Lankan custody, the Chief Minister said, adding, boats and fishing gear which were their only means of livelihood were still "impounded" in Lanka.
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"Without their livelihood base, these fishermen are in a state of despondency. Though the Government of Sri Lanka committed to consider the release of these boats, no decision has been taken in this regard," he said.
The Centre should secure immediate release of the 48 fishermen and 122 fishing boats, without any delay, he said.
The International Maritime Boundary Line with Sri Lanka "is itself a matter that is sub-judice in the Supreme Court of India," Palaniswami said.
He recalled that Jayalalithaa, as Opposition Leader in 2008, had filed a case in the apex court challenging the constitutional validity of the Indo-Lanka agreement on ceding Katchatheevu islet to the island republic.
(reopens MDS 2)
Meanwhile, another five fishermen from Pamban were taken into custody by the Lankan naval personnel for fishing in Thalaimannar, Ramanathapuram Fisheries Department Deputy Director Isaac Jayakumar said.
The five fishermen, who had put out to sea from Pamban near Rameswaram this evening were taken to Trincomalee by the Lankan authorities on charges of fishing in their territorial waters, he added.