Is there an aquarium or fish exhibits?

I think the Oceans world at the Indianapolis Zoo is better but yes they do have a small fish exhibit.

Yes, the manatee building also has fish, turtles and crocodiles in it.

From my take there isn't much of a fish exhibit. There is a building that holds a large tank with a couple Manatee and a few smaller tanks with different types of fish but I wouldn't say that was something that would be their strength. I'd go to the Newport Aquarium for that.

Yes a whole building