The Amur sturgeon, also known as the Heilongjiang apes and seven floaters, is a large-scale economic fish in the Heilongjiang River Basin. Ashes are divided into brown and gray two types. The brown species grows slower than the gray species and mainly grows in the middle and lower reaches of Heilongjiang. The resources and production are low. The gray species inhabits brackish waters in the mouth of the estuary, feeding on benthic organisms. The mature individuals in the population are mostly 10-14 years old, 105-125 cm long and 6-18.5 kg tail. The spawning group began spawning migration in the fall, and some individuals who had not reached sexual maturity also migrated from the estuary to the Heilongjiang River, and waited for mature spawning before descending from the river to the estuary area. 1. Breeding Techniques Broodstock Selection: Artificially breeding broodstock is generally harvested from Heilongjiang waters by naturally mature individuals. Females weighing 15 kg or more, males weighing 20 kg or more, and ages 9-13 years were selected. Females in the reproductive period are thinner, more pointed, more mucus on the body surface, thinner and softer abdominal wall, and enlarged and elastic abdomen. There was no significant change in body color and body shape of males, and individuals with body weights of more than 20 kg were mostly mature. Artificial oxytocin: When the water temperature is 16-24°C, artificial oxytocin production can be performed. Lots of oxytocins use LRH-A. The basic dose is 60-90 micrograms per kilogram of females, divided into two injections, and the first dose is 10%. Males are halved in dose, and males with better maturity may not be injected. The injection site is generally the base of the pectoral fin. Then the female and male broodstock are kept in ponds and stimulated by running water. Females swim actively when they start ovulation, frequently hit the surface of the water, and gently press the abdomen to the oocysts where there are eggs flowing out. Oviposition and insemination: The semen of the male fish was collected by extrusion and the high quality semen was pure milk. Ovum was collected by laparotomy or manual push and artificial insemination was performed by semi-dry method. The amount of semen used was 10 ml per kilogram of fish eggs. Diluted the semen with sterile water first, and then quickly poured the semen into the fish eggs, stirring evenly to fully combine the sperm and eggs. The eggs of Amur sturgeon are sticky and must be detacked before hatching. Detackifiers mostly use talcum powder or yellow mud to make 20% and 10% suspensions. When they are debonded, the suspension is poured onto the fish eggs and continuously stirred. When the eggs are all dispersed particles, the water can be flowed. incubation. Egg hatching: The incubation temperature is 16-24°C and the optimum temperature is 19-22°C. The egg size of Amur is larger, about 40,000 grains per kilogram. It is best to hatch in microfluidic conditions. At an average water temperature of 17[deg.] C., the film was formed about 105 hours, and when the average water temperature was 21.5[deg.] C., the film was released about 8 hours. The newly hatched seedlings are 1.1-1.3 cm long and can move vertically if they are cricketlike. 2. Seed cultivation ponds can use outdoor ordinary cement pools, with an area of ​​about 300 square meters and a water depth of 1.5-2 meters. The specifications for stocking in the same pool should be neat. Fish were soaked in 5% saline before entering the pond and feed was started the next day. In the early stages of feeding, leeches can be used and gradually domesticated into artificial compound feeds. Artificial feed containing crude protein should be about 38%. Feeding 3 times a day, feeding 2% of fish weight. During the rearing period, the water level should be above 1.5 meters, water temperature below 26°C, dissolved oxygen 6 mg/L. 3, adult fish cultured oysters, like other squid, can be kept in small water bodies, can also be stocked in large bodies of water, but also can be cultured in cages. In small ponds such as cement ponds and earth ponds, high-density intensive culture methods are generally used to feed large-sized fingerlings. After about one year of feeding, the specifications can reach about 2 kg. The stocking in lakes and reservoirs is mostly mixed and extensive.
Glass Vial,Cork Bottle,Wishing Bottle
Glass Ampoule,Caps Or Seals,Moulded Vials Co., Ltd. , http://www.ns-pharmaceutical.com