Acipenser Schrencki Brandt is the most valuable and precious fish in China, and it is also one of the emerging breeding objects in China. Alum was produced in the waters of Heilongjiang, and has received much attention due to its unique scientific value and economic value. The biological characteristics and breeding techniques of Amur sturgeon are as follows. The biological characteristics of Amur sturgeon 1,1 The taxonomic status and geographical distribution of Amur sturgeon The existing species of sturgeon in the world belong to 2 genera, 6 genera and 27 species, and the sturgeon is affiliated to Acipenseridae and Acipenser. Heilongjiang eel, seven floats. It is mainly distributed in the middle and lower reaches of Heilongjiang Province, as well as in the adjacent marshy marshes, lakes and bays. The Songhua River and Wusuli Rivers are scarce, and Nen River is almost extinct. China has the highest output in the middle and lower reaches of Heilongjiang. 1, 2 Morphological characteristics of the fish body slender spindle-shaped, flat belly. The body is bare and scaleless, with 5 rows on the back, 2 on the body side and 2 on the abdomen. The bone plate was covered with tiny bone particles. Juvenile fish bone plate has a posterior spinous process. The mouth is small, located on the ventral surface of the head, and is tubular in shape; the lips are wrinkled and resemble petals. The capsules are not linked. There are four tentacles juxtaposed in front of the mouth, and there are several scallops in front of the whiskers, hence the name Seven Floats. Shi's eyes are smaller and her nose is more developed. The dorsal fin is located near the caudal fin at the back of the body, the caudal fins are dovetailed, and the upper leaves are well developed. The spinous hardy scales are distributed on the back of the caudal fins. The sturgeon's back is brownish gray or brown, juveniles are black or dark gray, and the abdomen is white. The owl is similar to the Siberian halberd. The difference is that it has an ordinary non-sectored pod, with 26-50 pods. There are 11-17 back bone plates, 31-51 side bone plates and 7-14 abdominal plate. Dorsal rays 30-50, pelvic strips 15-30, anal rays 17-30. The mature individuals accounted for 15.03%-21.88% of the total length, 28.30%-45.70% of the head length, and 9.21%-13.95% of the total body length. 1-3 Habitats Shiw is a typical river fish that inhabits the bottom of gravel sediments, and sometimes enters lakes and marshes in summer. Hi clear water quality, a wide range of suitable temperature, fish 15cm or more, the survival temperature of 1-33 °C, suitable water temperature 14-26 °C, the best water temperature 18-22 °C. Winter in the deep river wintering and feeding under the ice, but the food is small. Stanley was docile and slow in action. He liked to swim at the bottom of the river. It was Wang who entered Wangshui District. Individuals with mature gonads swim to the spawning ground during the thawing of the Spring Festival. Juveniles are usually fattened at Jiangwan, Jiangya, Hubu and Wangshui stable stream. The oysterfish is a demersal fish. It has strong light and weak light habits. 1,4 Edible Amur sturgeon is an animal-eating fish. It feeds on aquatic insects, mollusks, benthic crustaceans, and eight-legged larvae, and sometimes eats small fish. Juveniles feed on zooplankton, benthic and aquatic insect larvae. Under natural conditions, sexually mature individuals do not eat substantially during reproduction. Astragalus ingested slowly, mainly relying on touch and smell to prey. In the artificial feed environment, Astragalus domesticus artificial artificial diet feed, it requires crude protein content between 37% -52%. The growth rate of A. japonicum is faster, especially when the fish body length exceeds 15, the growth rate is accelerated. In the 1989 fishing group of Amur sturgeon in Heilongjiang, the number of fish with 9-18 years of age accounted for 77.7%, the fish with a body length of 100-180cm accounted for 87.1%, and the fish with a body weight of 5-25cm accounted for 81.2% of the population. The length of the larvae of 1-3 days of A. sinensis is mostly 1.0-1.6, the length of 4-6 days of larvae is mostly 16-22cm, and the length of 7-9 days of larvae is usually 22-28cm. The maximum weight of the artificially-fed A. straminea for 6 months was 782g, and the average weight was 507g. The longest individuals of the 11-month-old juvenile Acipenser schrenckii were 69.8 and 56.9 cm in length. 1,6 Breeding habits of Castanopsis kawakamii mature late, the first maturation age of females is 9-13 years old, males are 6-7 years old, reproductive cycle is 2-4 years. Breeding groups are divided into spring migration and autumn migration. Spring migratory sexual mature individuals swim to spawning grounds during the spring months of May and June for spawning. Autumn migratory sexual mature individuals swim to spawning sites from August to September, and breed in the spawning grounds from winter to spring. When the water temperature is 17-20°C, A. sinensis produces a sticky egg in a gravel-bottom section with a steady flow of water and a depth of 2-3m. The ratio of male to female is 1:1.67. Astragalus female fertility is generally 30,000-1.6 million. The fecundity of females accounts for 10-42% of body weight, with an average of 25%. Mature eggs are oval-shaped, grayish green or dark green, shiny and elastic. The average egg size of the mature ovary is 2.5-3.5 mm, and 1 g weight is 44 eggs. Fertilized eggs hatch larvae at 1800-1980 (°C.h) and accumulative temperatures at water temperatures of 17-21°C. Newly hatched larvae and larvae do not balance their movement due to the presence of large yolk sac, and they only keep vertical in the water. movement. (to be continued)