The largest fish in the world is the basking shark (Cetorhinus maximus), which can grow up to 12.8 meters long and weigh around 21 tons. The basking shark is characterized by its huge body, broad head, and large mouth, which can open up to an angle of 1.5 meters.
It lives in the cold waters of the North Atlantic and Pacific Oceans and feeds mainly on plankton and small fish. It is considered harmless to humans, but due to its size and occurrence in deep waters, it can be a great danger to humans when diving. This type of shark is protected by international agreements and organizations concerned with the protection of marine life.