Seeking Modi's personal intervention for setting free the fishermen, Panneerselvam said in a letter to him that the talks would be meaningful only if the fishermen and their boats were released.
The third round of talks between fishermen of India and Sri Lanka on the contentious issue of fishing rights in Palk Bay and Palk Straits are scheduled to be held on March 24 here and the Lankan delegation of fishers are expected here tomorrow.
Noting that the groundwork for talks was complete and expectation was high that the exercise could lead to a breakthrough, he said the arrest of the fishermen at such a time in two separate incidents yesterday was most "disconcerting and shocking."
"The steps taken to defuse the tense situation in coastal districts and to create a conducive atmosphere for the smooth conduct of bilateral fishermen level talks could be undermined by this action of the Sri Lankan authorities," he cautioned.
"When they were fishing in Palk Bay, 33 fishermen in 5 boats belonging to Rameswaram and 21 fishermen in 5 boats belonging to Jagathapattinam who set sail on March 21 were arrested by Sri Lankan Navy and have been remanded up to March 27 and April 2 respectively," he added.