The fish you mentioned is called Gayazi fish, which is distributed in many areas of China. It is called stickleback in the south and Pelteobagrus fulvidraco in Chinese literature. It mainly lives by preying on small fish and shrimp. The larger fish can reach more than 20 centimeters in length and weigh about half a catty, and the smaller fish can reach 10 centimeters, two or three times. This kind of fish helps to keep fit and produce milk, and it is the best choice for people who are confined to the moon.