This document lists and provides some information about various water animals including fish like salmon and tuna, birds that fish such as kingfishers and pelicans, marine mammals like dolphins and whales, and reptiles like crocodiles and alligators. It provides specific details about Banggai cardinal fish changing sex from male to female as they mature and dolphins' ability to sleep with half of their brain at a time. The document covers a wide range of aquatic animals found in oceans, rivers, and lakes.