The largest fish in the ocean is the whale shark. The whale shark, a shark of the genus Whale Shark in the family Whale Shark, has a huge body, up to 20 meters in length, and is the largest fish in the world, weighing up to 20 tons.

Whale shark features are as follows:

The body surface is scattered with light-colored spots and crisscrossed light-colored bands, like a checkerboard. The nostrils are located on either side of the upper lip and appear inside the mouth. Teeth are numerous and small, arranged in multiple rows. Gill slits 5 pairs, gill slits basally large, almost reaching the dorsal and ventral margins of the body, the last pair of gill slits located in front of the base of the pectoral fins. Dorsal fins 2, without spines, the first dorsal fin is located in front of the ventral fin, with an anal fin. The caudal peduncle is laterally ribbed and the caudal fin is crescent-shaped, with the lower lobe shorter than the upper lobe. As in the whale shark, there are two dorsal fins of different sizes, the pectoral fins are large and located under the third pair of gill slits, the ventral fins are small, the caudal fins are forked, and the mouth is wide and terminal, with gill rakers like sponges.

The whale shark is an oceanic fish. Eat a lot of plankton and small fish. Mainly distributed in various tropical and temperate zones, China's sea areas in the summer and fall seasons are distributed. It has a mild temperament. Due to mass killing, the number of sharply reduced.

The blue whale is a marine mammal, not a fish, although its size and weight are larger than that of the whale shark. So currently the largest individual of all fish in the world is the whale shark.