Diet in September 9

Fishes are thermotropic aquatic vertebrates that swim and feed on the upper and lower jaws in coordination with their tail and trunk swings and fins. They belong to the subphylum Vertebrates of the Chordata. They are generally classified as fish (53%), birds (18%), reptiles (12%) and mammals. There are five main categories (9%) and amphibian (8%). According to the statistics of the late Canadian scholar "Nelson" in 1994, there are 24 618 species of living fish in the world, accounting for more than half of the named vertebrates, and new species of fish are constantly found. The average annual number of fish is about 150 species, which should have increased by more than 1500 species in more than ten years. At present, there are about 32100 species of named fish in the world.