A good breed of aquaculture with high economic value-Arrowhead

Yaluo fish is also known as river fish and slippery fish. There are more than 20 species of Yaluo fish in the world, which are only distributed in China, Japan, Korea and the eastern part of the former Soviet Union. There are about 10 species of Yarodon in China, which are mainly distributed in the waters of northern China. The species vary from region to region. The species with mature culture technology and high economic value are: ① Baikal Yaro. It is mainly distributed in Burjin area of our country. This fish is a small and medium-sized precious fish with a weight of 100g to 200g, good meat taste, strong fecundity and high population yield. ② northeastern Arroyo. Most of them are distributed in the waters of Heilongjiang, Songhua River, Nenjiang River, Haila River, Yalu River, Liaohe River and Hulunchi, weighing 500g to 700g. It is an efficient breeding variety and has been popularized throughout the country. ③ round bellied yalo fish. Native to the inland waters of northern Europe and Siberia, Russia, it grows fast in rivers found only in the north of China, with a maximum weight of 4000 grams, and has now begun domestication and breeding. ④ beach Yaroya fish. Distributed in Heilongjiang and Tumen River systems, it is a large reproductive migratory fish that spawn in freshwater rivers from offshore in May every year. ⑤ pearl star yalo fish. Produced in the Tumen River system, most of the body weight is 1000 to 1500 grams. Because of its high economic value, the fish has been cultivated in a large area of the country as an artificial breeding object.

Arroyo is a kind of upper and middle fish living in rivers and lakes with slow flow and fresh water quality. its main food is aquatic insects, molluscs and large zooplankton, followed by aquatic vascular plants, algae, small fish and shrimp. The food of juvenile fish is mainly zooplankton. Arroyo has strong adaptability and resistance, and is not easy to get sick. It can live in seawater, salt water, fresh water, pure fresh water and alkaline water with pH above 9. However, it is very easy to die after fishing, so the breeding technology is more difficult.

Arrowhead fish have higher requirements for culture conditions, with a pond area of 0.3 to 0.5 hectares, with a maximum of no more than 1 hectare, a water depth of more than 2.5 meters, and convenient drainage and oxygen enrichment facilities. Clear the pond thoroughly with quicklime before fish stocking, whether it is overwintering fish or summer flower fish, the dissolved oxygen in the water should be kept above 5 mg / L, generally not suitable to use organic fertilizer to cultivate natural bait, otherwise, it will reduce the survival rate of culture. Every 667 square meters (1 mu) of water surface stocked 300 million 400 overwintering fry, if summer fry were released, 1000 fry were released, and 200 fry were stocked with silver carp and bighead carp fingerling. Yalo fish have higher requirements for feed protein, the protein content of feed should not be less than 30%, and the proportion of animal protein should not be less than 35%. Water quality management should be strengthened throughout the breeding period to create a good ecological environment for fish.