Kadal Meengal is a 1981 Indian Tamil language film starring Kamal Haasan, Sujatha, Nagesh and Thangavelu and was a remake of the Malayalam movie Meen, which was loosely based on the Hindi movie Trishul. The movie was a Superhit at the box office
Selvanayakam a.k.a. Selvam Kamal Haasan is a poor but hardworking fisherman who is in love with Bhagyam Sujatha from the same fishing hamlet. After a tiff with the locals, Selvam moves to a neighbouring village for fishing and is feared dead during a cyclone. Selvam returns alive after a while and unable to find Bhagyam, marries another woman. Bhagyam has borne his child but lives in isolation away from the life of Selvam who has grown to be a rich businessman. After several years, Bhagyams son Rajan the younger Kamal Haasan finds out about his father whom he despises for having deserted his mother. He vengefully joins his fathers rivals and enters into a long confrontation with his father in business and in personal life as well. Nisha Swapna, is Rajans love interest while Ambika plays his stepsisters role.
Source: Wikipedia