What is the shape and habit of puffer fish?

The oriental dolphin is short, oblong, with a wide snout and developed lips. There are obvious seams between the upper and lower jaws, and each has two plate-shaped teeth. There is no first dorsal fin and ventral fin. The dorsal fin and the gluteal fin are symmetrical and similar, and there are no fins and fins 6- 19. It has a caudal stalk, and the caudal fin is wide and short, round, cross-sectional or shallowly forked. There are 18-2 1 vertebrae with short branchial foramen and lateral position. There are false gills, swim bladders and airbags. Red-finned oriental dolphin has black back, stable body color and pattern, large chest spot and white or reddish buttocks. The back of Pseudoyang Oriental Dolphin is black, but the body color and pattern are not stable enough, the chest spot is large, and the anal fin is black or light black. Most species of puffer fish live in warm oceans, and a few live in fresh water, which is a bottom carnivorous fish. The oriental dolphin inhabiting the southeast coast of China is a typical anadromous spawning species, and its breeding season is from April to June. In late spring and early summer, they return to Danshui River in groups to lay eggs. The number of eggs is generally 6.5438+0.4 million-300,000, most of which are 6.5438+0.2 million, and the egg diameter is 0.9 mm-654.38+0.0 mm mm. Young fish are in rivers or lakes leading to rivers. Oriental dolphin with lead spot is one of the common ashore species in the Yellow Sea and Bohai Sea. The spawning period is from the end of April to the end of May, and the peak period is from the beginning of May to the middle of May. This species is naturally rich, with small adult fish and slow growth. Takifugu rubripes and Takifugu pseudoqing are large species living in the ocean, with few natural populations but fast growth. They are the main dolphin species sold and bred in the market at present. The spawning period in the Yellow Sea and Bohai Sea is from May to June, and the peak period is from mid-May to early June.

Pufferfish are fierce by nature, and they will bite each other from the teething stage to the adult stage. When encountering the enemy, the airbag expands rapidly, making the abdomen expand into a ball and floating on the water to escape the enemy's harm. After leaving the water, it can bulge the abdomen and make a cooing sound, so it is called "gas drum fish" by the people.