What kind of fish is a bastard in the countryside?

Grass carp, where does the bastard point? Grass carp? Grass carp, commonly known as pomfret, grass pomfret, pomfret, Qing Wu, grass bud and grass-root fish, is bluish yellow, with bluish gray back, gray abdomen and gray fins.

Fish is a kind of aquatic vertebrate with variable temperature. It breathes through gills, swims through the swinging of tail and trunk, and feeds on the upper and lower jaws. It belongs to the vertebrate subfamily of Chordata. Vertebrates are generally divided into fish (53%), birds (18%), reptiles (12%), mammals (9%) and amphibians.

According to the statistics of the late Canadian scholar Nelson in 1994, there are 246 18 species of fish in the world, accounting for more than half of the named vertebrates, and new fish species are constantly discovered, with an average of about 150 species per year, which should increase by more than 1500 species in more than ten years, and the world has been named.

Fish are mainly divided into tropical fish, temperate fish and cold water fish. Aquatic fish are divided into freshwater fish and saltwater fish. Fish are mostly cold-blooded animals, and very few are warm-blooded animals. They breathe through their gills and have jaws and fins. The existing fish can be divided into two categories: cartilaginous fish (such as sharks) and bony fish (fish with linear fins and wavy fins).

Both groups of fish first appeared in the early Devonian. A more advanced group of linear finned fish, called bony fish, began to evolve in Jurassic and has become the most individualized fish. There are also several extinct fish. Fish, accompanied by human beings for more than 5,000 years, has formed an indissoluble bond with human beings and has become an extremely important food and ornamental pet in human daily life. However, few people know what an animal is a fish and how to define it. With the development of science, people's definition of fish has changed a lot.

Nearly 500 million years ago, the life course on the earth took a great leap, and the earliest fish-shaped animals appeared, which opened the prelude to the history of vertebrates, thus leading to the development of the animal kingdom and entering a new historical stage. Real fish first appeared more than 300 million years ago. In the whole long historical process, a large number of fish have survived, and with the passage of time, they have already become extinct. Fish that live on the earth are only a tiny part of the species that later appeared and evolved.