Wild baby fish, also known as giant salamander, is an amphibian, belonging to the cryptobranchidae, mainly distributed in the Yangtze River, Yellow River and Pearl River Basin. It can't chew its teeth. It just opens its mouth and swallows the food, then slowly digests it in its stomach. Baby fish have a strong ability to endure hunger. They will not starve to death if they are kept in cool water for two or three years without food. It can also overeat, and a full meal can add up to a fifth of the body weight. When food is scarce, the same kind of mutilation will occur, and even the egg will fill the hunger.

So, what's the difference between cultured and wild doll fish?

1. From the outer skin, the back skin of wild giant salamander is smooth and smooth, thin and even, with waxy light. The domesticated back is slightly thicker, with rough warts and no light texture.

2. From the aspect of body color, the body color of domestic giant salamanders is generally gray-white and light; most wild giant salamanders have their own patterns and body color is dark.

Third, from the body shape: wild giant salamander, due to long-term natural foraging, healthy, long body, large head, tight muscles. The domesticated giant salamander is bulky, thick and clumsy, and has soft muscles. The domesticated giant salamander has wider and softer abdominal folds, which are easy to expose in vitro, while the wild or ecological giant salamander has shorter and thicker abdominal folds, which are not easy to expose.

4. Pressure back muscles: Wild giant salamanders have stronger muscle elasticity and stronger rebound force when they are pressed with their fingers. However, the domestic giant salamander is weak in elasticity and feels soft and weak in rebound when it is pressed with its fingers.

       Because of its tender and delicious meat, it has been hunted and killed for a long time. The number of producing areas has declined sharply, and some of them are on the verge of extinction. The current reality is that giant salamander is a precious wild resource. It is mainly because of human factors, especially the loss of living environment, habitat destruction and overuse, which poses a serious threat to the survival of giant salamander, resulting in a sharp decline in population, multiple shrinkage of distribution area and endangered status.