Which is the largest fish in the world?

The largest fish in the world is the whale shark, which can reach lengths of around 12 metres and sometimes more, and weigh over 20 tonnes. Despite its enormous size and the word shark in its name, it is completely harmless to people, feeding by filtering tiny plankton, small fish, and eggs from the water through its huge mouth. Whale sharks are found in warm oceans worldwide and are known for their distinctive pattern of pale spots and stripes, which is unique to each individual, much like a fingerprint. They are slow-moving and often allow divers to swim alongside them. It is important to note that the whale shark is a fish, unlike whales, which are mammals; the blue whale is a larger animal overall but is not a fish. Whale sharks are considered endangered.