First, regulate the quality of hatchery The requirements of the ecological conditions of the eel fry are more stringent, mainly in terms of water quality. During the entire fry cultivation stage, it requires fresh water, rich dissolved oxygen, and a pH of 7.0 to 8.0 without contamination. The sword can be used to strictly filter the 80-90 mesh sieve, and the water source should be disinfected once every two weeks with a chlorine preparation. 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. Cultivation of carp seedlings in a circulatory system, with a stocking density of 30,000 to 50,000 tails/m3. This method ensures fresh water quality, adequate dissolved oxygen, large water exchange volume, no warm water layer, and easy removal of some of the dirt. The general survival rate reaches 40%.
Second, the good opening of food just hatched larvae, full-length only 4mm, weight about 1g, at water temperature 23 ~ 37 °C, 60 ~ 72h after the carp seedlings yolk sac disappeared, is in endogenous nutrition exogenous 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 gonad developmental degree of broodstock, the duration of spawning needs 6 to 8 hours. In the incubator, the difference between the early and late film production time is 10 to 19 hours. In order to ensure that the eel fry at different stages can obtain palatable fish fry, 2 to 3 batches of freshly-expanded lumphead seedlings are needed within 1 to 3 days of feeding to increase their survival rate.
Third, feeding suitable fish bait fish habits of mutual residual food, bait fish species, abundance apology, specifications and supporting the breeding of bait fish, etc. have a vital impact on the survival rate of carp. The supporting hatchery of the open-baited fish head larvae should be arranged at 2 to 3 days after the puerperal spawning, and the amount is 2 to 3 times that of the eel fry. When the carp starts to grow for about 5 days, it will be able to put on other fish fry, which are just out of the fish. Generally, 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 once a day, morning and evening, each feeding 2 to 3 times the amount of carp seedlings. 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.
Fourth, pay attention to the prevention and treatment of fish surimi to ensure that the eel fry before 2 cm in length does not occur disease is the primary measure of success or failure of nursery, and this time the eel fry body surface scale-free coverage, physical weakness, 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, and mixed with salt water (2% to 4%) and formalin (40ml/m3), and then sprinkled with “blood stop†(0.02ml/m3), before the start of eating. Penicillin should also be added one day and two days after starting the diet. In addition, the bait fish was also washed with saline (2%-4%) for 5 min when fed.
5. During the period of management and cultivation during the cultivation period, it is imperative to strictly implement fine management, which includes: thoroughly disinfecting water bodies to prevent pathogens from being brought into nursery ponds; strictly controlling water quality and timely discharging cleanliness; timely breeding of bait fish and paying attention to the requirements for the cultivation of 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 grasping the management of every link during the cultivation of nursery stocks can the survival rate of carp seedlings be effectively increased.
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