For Marine biology this are some college
1) Pondicherry  University (Port Blair campus)
2) Karnataka University (dharwad)
3)Cochin University of science and technology
4) Pondicherry University (puducherry)
5) Annamalia University (Tamil Nadu)
6) College of science and technology (Andra Pradesh)
These are some good college you can prefer for Marine biology

For aquaculture
1) College of fisheries  (Mangalore Karnataka)
2) College of fishery science (pantnagar uttranchal)
3) Central institute of fisheries Mumbai
4) College of Fisheries Tripura
These are good college you can prefer for pg in aquaculture

Hope it will help you out!