Whale shark, a shark of the family Whalesharkidae.There are only 1 family, 1 genus and 1 species of whale shark.With a huge body and a total length of up to 20 meters, it is the largest fish in the world.The body surface is scattered with light-colored spots and criss-crossing light-colored bands, like a chessboard.The nostrils are located on either side of the upper lip and appear inside the mouth.The teeth are numerous and small, arranged in multiple rows.