Try and include the Vizhinjam Marine Aquarium in your travel itinerary if you visit Kovalam /Trivandrum
Good place to take your family. The aquarium is not so well maintained. However, it has a better variety of sea water fishes. There were two large turtles in a big tank probably for rehabilitation...
The Sagarkia Marine Research Aquarium of Vizhinjam Marine Aquarium with a good collection is a visual treat of aquatic species . The seahorses, angel fish, box fish, clown fish, eels etc to name few...