This place is good and maintained very nicely. I have visited once, it ws a free pass(secret ☺️). In Kerala it's one of biggest aquarium and it's mix of Marine n fresh water fishes. A bigger version of this is there in Ahmedabad. Science City . It has a huge underground marine aquarium with rare fishes and also penguins are there. I just wanted to say Marine world is not biggest aquarium in India. Don't misguide knowledge of people with these kind of captions