In view of the fact that the broodstock brooders are not synchronised in spawning and the oviposition is not timely leading to poor embryonic development, it is proposed to build a dedicated spawning pond suitable for spawning and gathering of squid, which is to increase oviposition rate, hatching rate and seedlings of squid. The key to nurturing survival rates. The cultivation of eel and summer fish should be carried out in stages, and provide enough palatability fish (seedlings) to maintain good water quality and prevent disease in a timely manner. First, choose the pond: To choose the shape of the rules, convenient drainage, less silt, in the local (north-cold mountainous areas in the north) is best to be able to winter, easy to pull the net operation of the pond. Second, the preparation of bait fish: bait fish is the key to ensure the survival rate of the summer fish pond, fish food palatability is a key issue, the bait fish body length is preferably less than 1.52 times the length of the carp summer flower body, The best varieties were grass, alfalfa, alfalfa, alfalfa, alfalfa and so on. Third, the choice of seed: When purchasing the squid summer flower species, we must choose the best-selling varieties of the local market, which will not only benefit the economic benefits generated by sales will be considerable. The standard is summer flowers with neat specifications, robust physique, and strong activity. Fourth, the appropriate density of stocking: stocking density directly affects the survival rate and seedling growth of carp summer flower seedlings, so it must be based on the source of water, bait fish supply and type, pond conditions and other flexibility. In the local (north-cold mountainous areas in the north of China), the total mu is 400,600. V. Controlling hatchery water quality: The requirements for ecological conditions of carp seedlings are more stringent, mainly for water quality. During the entire fry cultivation stage, fresh water quality is required, and the dissolved oxygen is rich in pH 7.0 to 8.0 without pollution. The sword can be strictly filtered with 80~90 mesh sieve, and the water source should be disinfected with chlorine preparation once every two weeks. The conditional unit is best to build a sand filter, and the water filtered by the sand filter is directly sent to the ring through the water tower. The use of circulated water to cultivate eel fry, the stocking density of 30,000 to 50,000 / m3, this method can guarantee fresh water, dissolved oxygen, water exchange volume, no warm layer, easy to discharge part of the dirt, The general survival rate reaches 40%. Six, the good open food customs: just hatched larvae, full-length only 4mm, weight about 1g, at water temperature 23 ~ 37 °C, 60 ~ 72h after the disappearance of carp yolk sac, is in an endogenous source of nutrition Sexual nutrition transition period. At this time, although the digestive tract of the eel fry was obviously enlarged and thickened, but its digestive function was weak and its constitution was the weakest, the most important thing in this period was to provide enough palatability food to feed in time. If the fry is unable to ingest bait fry for a long time, its abdomen is flat and there is no stomach in the stomach. Even if it is fed into the bait fish again, the fry mackerel will not be able to catch it, losing its normal predation ability and eventually dying. Therefore, this period is the key to raising the survival rate of fry. From the results of comparison of several species of fry, it was found that the shoot heads of the group of about 8 hours after filming were the most suitable for the diet of baitfish. If newly hatched grass carp, carp, and carp seedlings are used, carp sometimes cannot swallow whole fish but only spit, resulting in increased mortality of carp seedlings. After 2 days of hatching, the head of the seedlings was affected by the increased activity and affected the feeding of the carp seedlings. The number of fish fed to bait increased to ten times that of salmon fry, making it easier for salmon fry to ingest bait fry. In the artificial propagation of squid, due to inconsistent maturation of gonad gonads, the duration of spawning takes 6~8h. In the incubator, the time between early and late film production is different by 10~19h. The difference is that in order to ensure that the eel fry at different stages can obtain puffy fish fry, 2 to 3 batches of freshly-expanded lumphead seedlings are needed within 1~3 days of feeding to increase their survival rate. 7. Feeding suitable bait fish: The behavior of squid has the habit of mutual sustenance, the variety of bait fish, abundance of apology, specifications, and the supporting breeding of bait fish have a crucial influence on the survival rate of squid. The supporting breeding of open-mouth bait fish head lice should be arranged in 2 to 3 days after the puerperium spawning. It is more appropriate for oxytocin production, and the amount is 2~3 times of the eel fry. When the carp starts to grow for about 5 days, it will be able to put on other fish fry, except for the head of the fish. Usually, as long as the eel fry eats 2~3d, it will produce 2~3 batches of home fish such as grass carp and carp. , squid and so on. Normally, the movement of carp seedlings is faster, which is not conducive to the feeding of carp seedlings. The feeding of bait fish should be timely, palatable and appropriate. Feed it once a day, morning and evening, each time feeding 2 to 3 times the amount of eel fry. The satiety-seeded salmon seedlings, whose abdomen is swollen, have a prismatic shape, and have a caudal shank and a microbow. When water is flowing, they rest against the inner wall or move with the water. The hungry carp is flat and spreads its food in the ring. The satiation of salmonids prevails. Excessive bait fish will cause deterioration of water quality. Too little will cause them to eat each other. Eight, pay attention to the prevention and control of fish gills: to ensure that the trout fry before 2cm in length does not cause disease is the primary measure of the success of breeding, and at this time the trout fry surface without scales, physical fragility, it is easy to be attacked by protozoa, do a day The prevention of diseases is essential. From the day before starting to eat, routine disinfection was performed once a day. When the medication is used, the water level of the water circulation loop should be appropriately reduced. Mix the salt water (2%~4%) and formalin (40ml/m3), and then sprinkling the “blood stop†(0.02ml/m3) separately before starting the food. Penicillin should also be added one day and two days after starting the diet. In addition, bait fish were also washed with saline (2%~4%) for 5 min when fed. 9. During the period of management and cultivation during the cultivation period, strict management must be strictly implemented, which mainly includes: thoroughly disinfecting the water body to prevent pathogens from being brought into the nursery pool; strictly controlling the water quality and timely discharging and cleaning the fish; timely breeding the bait fish, and paying attention to the requirements for the cultivation of the carp seedlings. Cohesion; regularly spilled drugs into the cultivation pool to effectively prevent disease; along with the growth of carp seedlings, the timely development of the sub-rings; conversion loops, configure the pump to ensure that it has a good growing environment. Only by doing a good job in the management of each stage of nursery cultivation can the survival rate of eel fry be effectively improved. The above are some of the experiences gained during the breeding of carp. If the farmers can perform scientific breeding according to the above methods, and exclude natural factors, the survival rate of carp species can reach 80% to 90%, and even reach 95% or more. , greatly increased the economic benefits of breeding. compass,High Quality compass,compass Details, CN Dongguan City Risen Medical Products Co., Ltd. , https://www.risenppe.com