1, the largest fish in the world: whale shark (average body length: 8 meters; Maximum length: 20 meters) A shark of the family Cetacidae. Whale sharks are only 1 family, 1 genus and 1 species. With a huge body and a total length of 20 meters, it is the largest fish in the world. Light spots and criss-crossing light bands are scattered on the body surface, like a chessboard. The nose is located on both sides of the upper lip and appears in the mouth.

2, the teeth are many and small, arranged in multiple rows. There are 5 pairs of branchial cleft, which are extremely large, almost reaching the back edge and abdomen edge of the body, and finally 1 pair of branchial cleft is located in front of the base of pectoral fin. There are 2 dorsal fins without spines. 1 Dorsal fins are located in front of ventral fins and have gluteal fins. The caudal stalk has a lateral edge, the caudal fin is crescent-shaped, and the lower leaf is shorter than the upper leaf. For example, whale sharks have two dorsal fins of different sizes, the pectoral fin is large, located under the third pair of branchial fissures, the ventral fin is small, the caudal fin is bifurcated, the mouth is wide, and the branchial rake is spongy.

It belongs to marine fish. Eat a lot of plankton and small fish. Mainly distributed in tropical and temperate seas, and distributed in all seas of China in summer and autumn. Mild temperament. Due to a large number of killings, the number has dropped sharply.