The scientific name of Gayu is Pelteobagrus fulvidraco. There are four kinds of Pelteobagrus fulvidraco distributed in China: Pelteobagrus fulvidraco, Pelteobagrus vachelli, Pelteobagrus fulvidraco and Pelteobagrus vachelli, among which Pelteobagrus fulvidraco and Pelteobagrus vachelli are the main cultured species with very similar biological characteristics. The latter grows a little faster, but its color is darker.

2. Morphological structure of Ga fish

Ga fish is naked and scaleless, and its lateral line is straight; Yellow-green on the back, dark yellow on the side, with black patches; The fin is gray-black, the abdomen is light yellow, and there are black spots on the caudal fin. The color of fish varies slightly with the water environment.

Gayou has a long body, a big flat head and a flat back and trunk. The oral fissure is large, and the upper and lower jaws have fine teeth; The eyes are small, with four pairs of whiskers, the nasal whiskers reach the posterior edge of the eyes, and the maxillary whiskers are the longest, reaching the back of the pectoral fin base; The front ends of dorsal fin and pectoral fin are hard spines, and the rear edges are serrated; The pectoral fin is fan-shaped, and the end is close to the starting point of the ventral fin; There is a fat fin on the back that is not connected with the dorsal fin.

3. Adaptability to the environment

Ga fish like to live in still water or slow flow, live in groups at the bottom, have strong adaptability to the environment, and like to move and eat in weak light. The survival water temperature is 4 ~ 38℃, and the optimum growth water temperature is about 25℃. No special heat preservation and heatstroke prevention measures are needed in winter and summer. The optimum pH value is 7.0 ~ 8.4. The growth rate of this species in ponds is average, and it has been on the market for two years, and its individual commercial fish is100 ~ 200 g.

4. Eating habits of Ga fish

Gayu is an omnivorous and carnivorous fish. In natural water, young fish feed on cladocera and copepods. Adult fish feed on eggs such as small fish and shrimp. Intercropping Ga fish in freshwater aquaculture ponds can effectively eliminate small wild fish and improve pond yield and economic benefits. Ga fish can also swallow anchovies and copepods larvae parasitic on the surface of fish, reducing the breeding of fish diseases; Under the condition of artificial culture, Gayu likes to eat soft fishy and live feed. Usually, fish, shrimp, mussel meat or leftovers from livestock and poultry processing are minced, and then adhesive is added to stir into balls and fed. In the south of China, artificial compound feed has been used to cultivate bighead carp in ponds or cages, and some fishermen in Tianjin have successfully introduced bighead carp fry from the south. /view/3 1659.htm？ fr=ala0