Even before Katchatheevu was ceded, Sri Lanka had periodically arrested Tamil Nadu fishers 

While visiting Rameswaram recently, Tamil Nadu Governor R.N. Ravi blamed the 1974 cession of Katchatheevu to Sri Lanka for the continuing arrest of fishermen. However, according to reports from The Hindu Archives, even before the islet was ceded, fishermen were arrested periodically by the Sri Lankan Navy on the charge of poaching