Biological Knowledge Popularization: Do you know what kind of fish is in the world?
The sea is the origin of life on earth, giving birth to many kinds of creatures, and land animals need to use their own strength to support the weight is different, living in the sea of living creatures do not have this trouble, the body grows to hundreds or even thousands of pounds is a common thing. Whales are the largest and heaviest of these creatures, but whales are not fish, they are born, breathe with their lungs, and their tail fins swing up and down, making them standard mammals. Excluding whales, many people may be confused when it comes to the largest fish in the sea. Most people don't know that the biggest fish in the sea is an animal called a "whale shark".
The whale shark, Rhincodon typus (Smith, 1828), is a shark of the genus Whale shark in the family Cetaceae. Whale sharks have only 1 family and 1 genus and 1 species. With a large body and a total length of up to 20 meters, it is the largest fish in the world. The surface of the body is scattered with pale spots and crisscrossing pale bands, like a chessboard. The nostrils are located on either side of the upper lip and appear in the mouth. The teeth are numerous and small, arranged in rows. There are 5 pairs of gill fissures, the gill fissures are extremely large, almost reaching the dorsal and abdominal margins of the body, and the last pair of gill fissures is located in front of the base of the pectoral fin. The dorsal fin is 2, spineless, and the 1st dorsal fin is located in front of the ventral fin and has an fin. The caudal stalk is laterally ridged , the caudal fin is crescent-shaped , and the lower lobes are shorter than the upper lobes. For example, whale sharks, with two dorsal fins, varying sizes, large pectoral fins, located under the third pair of gill fissures, small ventral fins, forked tail fins, wide mouth, terminal position, gill rakers like sponges.
