A bait ball, or baitball, occurs when small fish swarm in a tightly packed spherical formation about a common centre. It is a last-ditch defensive measure adopted by small schooling fish when they are threatened by predators.
When they unfold and get out in the open, they are formidable animals indeed: (a diver gets acquainted with one old and wise specimen in the Japan Sea, Primorie, Russia - a Giant Pacific Octopus Doflein).
Whale sharks are the world's largest fish. One of the most notable facts about whale sharks is that they are the world's largest fish. At a maximum length of about 65 feet and weight of pounds, a whale shark's size rivals that of large whales