When the eel fryers start eating, they need to ingest other live fish fry. Therefore, the artificial propagation of the eel requires the artificial breeding techniques and facilities of the “fish†to be technically difficult.
First, basic facilities
Squid pro-fish pond: 2 ports, with a total area of ​​2667?.
Home fish spawning pool: 1 mouth, area 40?.
Home fish hatching tank: A total of 110, each volume 0.17?.
Hatching ring: 2 only.
Water Tower: 1.
Reservoir: 2 mouths, each with an area of ​​1333?, totaling 2666?.
Sedimentation tank: 1 mouth, area 7.8?.
Filtration tank: 2 ports, 9 per port area, 18 in total.
Oxotropic agents: HCG, LHRH-A2.
Aerator: 2 sets, each power 1.5KW.
(I) Broodstock breeding
1, the source of broodstock
There was no injury or illness on the spot, the body was strong, and the squid with a weight of 750-3000 g was over 1:1. The female and male ratio was 1:1.
2. Restocking of broodstock
There are generally two ways to cultivate high quality carp broodstock:
(1) Polyculture in flower and white brood broodstock. In mid-September, use quicklime 150?/667? or bleaching powder 6?/667? dry clear pond. September 20-30 stocking carp 10-15 / 667, per kilogram of carp into the bait fish 5-7?, bait fish in the lower-middle fish, or less put some, and later add.
(2) Polyculture in fingerling pools: From the beginning of September, use 0.5 mg/L trichlorfon Quanchiposa, every 5 days or so, 2-3 times in succession, eliminate the anchor head, and then use bleach. 1mg/L disinfection. On September 20-30, after the toxicity of trichlorfon disappeared, the carp was stocked and stocked 15-20 groups/667.
3, daily management of broodstock
Whether it is stocked in a broodstock pond or a fingerling pool, a 1.5kW impeller aerator is set in the pool. When the dissolved oxygen is low, the engine is turned on and the engine is turned on at noon on a sunny day to prevent the catfish from lacking oxygen. Water should be fresh and transparent. Usually flush more water, and pay attention to observe whether the feed fish is sufficient; pre-pregnancy flushing, so that the squid squid fully developed.
(B) Fertility of broodstock
1, the choice of time in southern China pond carp broodstock generally start in mid-May production (the earliest in late April). When the water temperature reaches 19°C to 20°C, it is expected that the weather can be produced in the next few days when the weather conditions are good.
2, the choice of broodstock Mature female abdomen enlargement and soft, when the abdomen is up, the outline of the ovary is clear, the genital hole and anal swelling and protruding. Slowly insert the genital hole with an egg digger, excavate a few eggs, and after soaking for 2-3 minutes in the clear liquid, the white nucleus can be clearly seen. If any nucleus has been deviated, it indicates that the gonads are not developed until the middle to fourth stage of the fourth stage.
3. LHRH-A2 and HCG are used for inducing oxytocic administration. As long as the broodstock is well cultured, the rate of inoculation can reach 100%. The dose is: female LHRH-A25-10μg/?+HCG 800-1000IU/?; male fish halved. Usually from 15:00 to 16:00, using a single injection method.
4. Spawning Inject the broodstock into a 40-foot spat-shaped “family fish†spawning pool. Hang several bundles of brown tablets in the spawning pool and stimulate them with running water. At temperatures of 20.2°C to 22.6°C, the carp began to lay eggs at 28-32 h.
(c) Egg hatching
After spawning, eggs are placed in hatching tanks for hatching. Eggs are placed at a density of 34,000 - 40,000 grains/barrel, and are filtered with a 60-mesh sieve to remove large leeches and other debris. The sediment and plankton in the water are filtered through the filter tank. At a temperature of 20.2°C-22.6°C, the fertilized eggs passed the membrane at 54-59h. The control method of the water flow is: after the eggs are put into the hatchery, the water flow is faster; the flow rate is slowed down when the film is taken out; the flow rate is appropriately accelerated after all the films are taken out; and the flow rate is slowed down when the seedlings are able to swim flat. Other management methods are the same as those of the "fish" hatch.
(IV) Disease Prevention
1, water mold
(1) The broodstock is vulnerable to injury during fishing, transportation and oxyster production. Malachite green ointment and penicillin ointment can be used to wipe the wound. Postpartum should be placed in a pond with good water quality, disinfection, and a rich bait, and severely injured broodstock should be disposed of immediately.
(2) If the egg appears hydromycosis during hatching, the following methods can be taken: 1 Sprinkle with 100-150mg/L whetstone green solution in the hatching bucket every morning and evening; 1 Use 20‰-30 Rinse in saline for 5-10 minutes.
2. Protozoal diseases
There are mainly echinococcosis, followed by caterpillar fungus and cup worm disease. CuSO4+FeSO40.7mg/L can be used.
3, anchor head
90% crystal worm 0.2-0.7mg/L was poured in the hatchery and then water was stopped for 15-30 minutes. Or in the reservoir with 80% crystal trichlorfon 0.2mg / L spilled, separated once every 5 days, used 3 times.
First, basic facilities
Squid pro-fish pond: 2 ports, with a total area of ​​2667?.
Home fish spawning pool: 1 mouth, area 40?.
Home fish hatching tank: A total of 110, each volume 0.17?.
Hatching ring: 2 only.
Water Tower: 1.
Reservoir: 2 mouths, each with an area of ​​1333?, totaling 2666?.
Sedimentation tank: 1 mouth, area 7.8?.
Filtration tank: 2 ports, 9 per port area, 18 in total.
Oxotropic agents: HCG, LHRH-A2.
Aerator: 2 sets, each power 1.5KW.
(I) Broodstock breeding
1, the source of broodstock
There was no injury or illness on the spot, the body was strong, and the squid with a weight of 750-3000 g was over 1:1. The female and male ratio was 1:1.
2. Restocking of broodstock
There are generally two ways to cultivate high quality carp broodstock:
(1) Polyculture in flower and white brood broodstock. In mid-September, use quicklime 150?/667? or bleaching powder 6?/667? dry clear pond. September 20-30 stocking carp 10-15 / 667, per kilogram of carp into the bait fish 5-7?, bait fish in the lower-middle fish, or less put some, and later add.
(2) Polyculture in fingerling pools: From the beginning of September, use 0.5 mg/L trichlorfon Quanchiposa, every 5 days or so, 2-3 times in succession, eliminate the anchor head, and then use bleach. 1mg/L disinfection. On September 20-30, after the toxicity of trichlorfon disappeared, the carp was stocked and stocked 15-20 groups/667.
3, daily management of broodstock
Whether it is stocked in a broodstock pond or a fingerling pool, a 1.5kW impeller aerator is set in the pool. When the dissolved oxygen is low, the engine is turned on and the engine is turned on at noon on a sunny day to prevent the catfish from lacking oxygen. Water should be fresh and transparent. Usually flush more water, and pay attention to observe whether the feed fish is sufficient; pre-pregnancy flushing, so that the squid squid fully developed.
(B) Fertility of broodstock
1, the choice of time in southern China pond carp broodstock generally start in mid-May production (the earliest in late April). When the water temperature reaches 19°C to 20°C, it is expected that the weather can be produced in the next few days when the weather conditions are good.
2, the choice of broodstock Mature female abdomen enlargement and soft, when the abdomen is up, the outline of the ovary is clear, the genital hole and anal swelling and protruding. Slowly insert the genital hole with an egg digger, excavate a few eggs, and after soaking for 2-3 minutes in the clear liquid, the white nucleus can be clearly seen. If any nucleus has been deviated, it indicates that the gonads are not developed until the middle to fourth stage of the fourth stage.
3. LHRH-A2 and HCG are used for inducing oxytocic administration. As long as the broodstock is well cultured, the rate of inoculation can reach 100%. The dose is: female LHRH-A25-10μg/?+HCG 800-1000IU/?; male fish halved. Usually from 15:00 to 16:00, using a single injection method.
4. Spawning Inject the broodstock into a 40-foot spat-shaped “family fish†spawning pool. Hang several bundles of brown tablets in the spawning pool and stimulate them with running water. At temperatures of 20.2°C to 22.6°C, the carp began to lay eggs at 28-32 h.
(c) Egg hatching
After spawning, eggs are placed in hatching tanks for hatching. Eggs are placed at a density of 34,000 - 40,000 grains/barrel, and are filtered with a 60-mesh sieve to remove large leeches and other debris. The sediment and plankton in the water are filtered through the filter tank. At a temperature of 20.2°C-22.6°C, the fertilized eggs passed the membrane at 54-59h. The control method of the water flow is: after the eggs are put into the hatchery, the water flow is faster; the flow rate is slowed down when the film is taken out; the flow rate is appropriately accelerated after all the films are taken out; and the flow rate is slowed down when the seedlings are able to swim flat. Other management methods are the same as those of the "fish" hatch.
(IV) Disease Prevention
1, water mold
(1) The broodstock is vulnerable to injury during fishing, transportation and oxyster production. Malachite green ointment and penicillin ointment can be used to wipe the wound. Postpartum should be placed in a pond with good water quality, disinfection, and a rich bait, and severely injured broodstock should be disposed of immediately.
(2) If the egg appears hydromycosis during hatching, the following methods can be taken: 1 Sprinkle with 100-150mg/L whetstone green solution in the hatching bucket every morning and evening; 1 Use 20‰-30 Rinse in saline for 5-10 minutes.
2. Protozoal diseases
There are mainly echinococcosis, followed by caterpillar fungus and cup worm disease. CuSO4+FeSO40.7mg/L can be used.
3, anchor head
90% crystal worm 0.2-0.7mg/L was poured in the hatchery and then water was stopped for 15-30 minutes. Or in the reservoir with 80% crystal trichlorfon 0.2mg / L spilled, separated once every 5 days, used 3 times.
16 Slice CT,Veterinary Radiology,Micro Computed Tomography,Diagnostic Imaging In The Veterinary
MinFound Medical Systems Co., Ltd , https://www.minfoundmed.com