The Sri Lankan navy says it counted 5,000 Indian fishing boats fishing in northern Sri Lankan waters in November alone. Attracted by the lure of tiger prawns in the north and northwestern seas of the island, Tamil Nadu fishermen often cross over to Lankan waters. The poaching increased tremendously once the Sri Lankan government banned fishing off the north in the mid-'80s to counter rebel movements both from Tamil Nadu as well as from the north to the east of the island. As a matter of fact, these rich fishing grounds have been a bone of contention between Tamil Nadu fishermen and the Lankan navy for the last three decades. According to V. Suryanarayan, Director, Centre for South and Southeast Asian Studies, University of Madras, the root cause of the prevailing tension is a conflict of interests. Says he: "On the one side are the governments of Colombo and New Delhi, which in the spirit of good neighbourly relations concluded the maritime agreements of 1974 and 1976 ceding Kachchativu to Sri Lanka. On the other are the Tamil Nadu fisher-men who will not give up their means of survival which they have enjoyed for several centuries."