Whale Shark Grey ink in a 45ml bottle. The Whale Shark is the largest living fish, growing to be forty feet long or more. Despite being a giant of the ocean, the Whale Shark eats tiny plankton, one of only three species of sharks that do so. Whale Sharks live in all the warm ocean waters on Earth, they are able to thrive in coastal environments as well as open water. They feed at the surface but often dive to depths of several thousand feet.