Choose broodstock
Selection of broodstock standards: large individuals, females 8 to 10 cm, weight 15 to 20 grams or more, males larger than females; healthy and disease-free; appendages intact; with 1 winter, the number of spawning does not exceed 2 times is better; male to female ratio 4:1 or 5:1.
Doing Wintering and Prenatal Cultivation of Broilers
(I) Wintering Management
Choose a greenhouse with good thermal performance. The size of the cement pool is determined by the number of seeds to be preserved. Stocking densities range from 10 to 40 tails per square meter. The water temperature is maintained between 20 and 22°C. Dissolved oxygen is not less than 3 mg/l. Pay special attention to less water change and more pollution. Change the water to choose fine weather, 7 to 10 days, change the amount of water 1/3 to 1/2 is appropriate. The water depth is maintained at 70-80 cm and the pH is 7.8-8.0. The interior should be shaded and concealed objects should be set in the pool. Feeding mainly animal feed, fish, snail meat, silkworm cocoons, cockroaches and so on. The bait should be fresh, and the daily investment should be 3 to 4 times. The fed amount was 3 to 5% (dry weight) of shrimp body weight. And timely remove the residual bait to maintain good water quality. Prevents watery mildew and vibriosis. Saprolegnia can be controlled by gradually increasing the water temperature and slowly changing the water with a 0.1 ppm malachite green whole pool medicine bath for 30 minutes. Vibriosis Before the broodstock enters the pond, the pool is cleaned with 15ppm bleach or 100ppm potassium permanganate. The broodstock is bathed with 0.06-0.1ppm malachite green or 0.2ppm copper sulfate for 30 minutes. If the disease occurs during wintering, it can be treated with 20ppm formalin, and change the water in the next day by 1/3.
(B) Prenatal care
After wintering, when broodstock activity is enhanced and food intake is growing, they move into prenatal culture pools. Male to female ratio 4:1 or 5:1, 15 to 30 tails per square meter, water depth 60 to 70 cm. Dissolved oxygen was maintained above 4 mg/l. The feeding amount is 7 to 10% of the shrimp body weight. Change the water every 2 to 3 days, change the amount of water 1/3 to 1/2. Water temperature increased from 22°C to 25-26°C.
(3) Prenatal management of spawning and brooding
After mating spawning, the husbandry process is also fertilized. Therefore, special attention must be paid to careful management to prevent deovulation and increase hatching rate.
Grading. The spawning time of broodstock is different, so the breeding pond should not be too large, generally 10 to 20 square meters.
Feed the bait. The amount of feeding should be slightly surplus on the morning of the following day in order to prevent spawning and killing each other due to hunger and starvation.
Increase oxygen. Oviposition lobsters consume more oxygen and must be continuously inflated.
salinity. When the color of the egg changes from orange to gray, a small amount of seawater is added daily to achieve a salinity of 6 ‰.
Water temperature. Optimum water temperature 26 ~ 28 °C, water temperature high hatching fast, when the broodstock gonadal development is not synchronized when the temperature can be used to control the hatching rate of eggs.
Change the sewage. Sewage every morning, change the water 1/4 to 1/3 in 2 to 3 days.
(d) larval rearing
Nursery pond disinfection. After soaking, disinfect with 100-200ppm bleach or 20ppm potassium permanganate solution.
Larvae collection. Collect the larvae with a dip net. Be careful when operating.
Nursery water. Nursery pond water to be filtered. The salinity is 10 to 12 ‰ and the water body salinity is relatively stable.
density. Larvae are grown at a density of 50,000 to 150,000 per cubic meter.
5, water quality regulation. The larval development water temperature is controlled at 28 ~ 30 °C. Water temperature must remain relatively stable. The whole process of nursery needs to be continuously inflated. The pH value of 7-8 is appropriate. Keep 2 to 4 ppm of EDTA in water.
6, feed feeding. The juvenile larvae did not need to be fed within one day after hatching. One year later, the larvae were fed with no larvae. The daily shoots were performed three times in the morning, middle, and evening. Can also feed shrimp series micro-encapsulated pellet feed. Gradually feed cooked egg yolk or minced fish.
7, daily management. Microscopic examination twice a day, to observe abnormalities and gastrointestinal fullness abnormalities, and add water to the original water level. After feeding the egg yolks and minced meat pellets at the later stage of the nursery, the sewage suction work should be strengthened every day, changing the water once a day for 1/31/2 of the amount. After the pool is poured, salinity should be maintained once the water is changed and the pool is poured.
8, disease prevention and treatment. Use tools should be thoroughly disinfected. When polyprotozoa protozoa parasite. 0.2ppm malachite green medicine bath can be used for 0.5 to 1 hour or with formalin 35 PPM. 9, prawn desalination. When more than 90% of the larvae in the pool become metamorphosed into baby shrimp, they can be domesticated. Prior to desalination, the larvae of unaltered juveniles were removed and then a cage made of 40 mesh screen mesh was set up from one end of the inlet, and a plastic tube was inserted into the cage to siphon the drainage. Digestion of shrimps after 2.53 days should be maintained in the nursery pond for 3 to 4 days, and the water temperature should be adjusted slowly to the outside water temperature before entering the pond culture.
Selection of broodstock standards: large individuals, females 8 to 10 cm, weight 15 to 20 grams or more, males larger than females; healthy and disease-free; appendages intact; with 1 winter, the number of spawning does not exceed 2 times is better; male to female ratio 4:1 or 5:1.
Doing Wintering and Prenatal Cultivation of Broilers
(I) Wintering Management
Choose a greenhouse with good thermal performance. The size of the cement pool is determined by the number of seeds to be preserved. Stocking densities range from 10 to 40 tails per square meter. The water temperature is maintained between 20 and 22°C. Dissolved oxygen is not less than 3 mg/l. Pay special attention to less water change and more pollution. Change the water to choose fine weather, 7 to 10 days, change the amount of water 1/3 to 1/2 is appropriate. The water depth is maintained at 70-80 cm and the pH is 7.8-8.0. The interior should be shaded and concealed objects should be set in the pool. Feeding mainly animal feed, fish, snail meat, silkworm cocoons, cockroaches and so on. The bait should be fresh, and the daily investment should be 3 to 4 times. The fed amount was 3 to 5% (dry weight) of shrimp body weight. And timely remove the residual bait to maintain good water quality. Prevents watery mildew and vibriosis. Saprolegnia can be controlled by gradually increasing the water temperature and slowly changing the water with a 0.1 ppm malachite green whole pool medicine bath for 30 minutes. Vibriosis Before the broodstock enters the pond, the pool is cleaned with 15ppm bleach or 100ppm potassium permanganate. The broodstock is bathed with 0.06-0.1ppm malachite green or 0.2ppm copper sulfate for 30 minutes. If the disease occurs during wintering, it can be treated with 20ppm formalin, and change the water in the next day by 1/3.
(B) Prenatal care
After wintering, when broodstock activity is enhanced and food intake is growing, they move into prenatal culture pools. Male to female ratio 4:1 or 5:1, 15 to 30 tails per square meter, water depth 60 to 70 cm. Dissolved oxygen was maintained above 4 mg/l. The feeding amount is 7 to 10% of the shrimp body weight. Change the water every 2 to 3 days, change the amount of water 1/3 to 1/2. Water temperature increased from 22°C to 25-26°C.
(3) Prenatal management of spawning and brooding
After mating spawning, the husbandry process is also fertilized. Therefore, special attention must be paid to careful management to prevent deovulation and increase hatching rate.
Grading. The spawning time of broodstock is different, so the breeding pond should not be too large, generally 10 to 20 square meters.
Feed the bait. The amount of feeding should be slightly surplus on the morning of the following day in order to prevent spawning and killing each other due to hunger and starvation.
Increase oxygen. Oviposition lobsters consume more oxygen and must be continuously inflated.
salinity. When the color of the egg changes from orange to gray, a small amount of seawater is added daily to achieve a salinity of 6 ‰.
Water temperature. Optimum water temperature 26 ~ 28 °C, water temperature high hatching fast, when the broodstock gonadal development is not synchronized when the temperature can be used to control the hatching rate of eggs.
Change the sewage. Sewage every morning, change the water 1/4 to 1/3 in 2 to 3 days.
(d) larval rearing
Nursery pond disinfection. After soaking, disinfect with 100-200ppm bleach or 20ppm potassium permanganate solution.
Larvae collection. Collect the larvae with a dip net. Be careful when operating.
Nursery water. Nursery pond water to be filtered. The salinity is 10 to 12 ‰ and the water body salinity is relatively stable.
density. Larvae are grown at a density of 50,000 to 150,000 per cubic meter.
5, water quality regulation. The larval development water temperature is controlled at 28 ~ 30 °C. Water temperature must remain relatively stable. The whole process of nursery needs to be continuously inflated. The pH value of 7-8 is appropriate. Keep 2 to 4 ppm of EDTA in water.
6, feed feeding. The juvenile larvae did not need to be fed within one day after hatching. One year later, the larvae were fed with no larvae. The daily shoots were performed three times in the morning, middle, and evening. Can also feed shrimp series micro-encapsulated pellet feed. Gradually feed cooked egg yolk or minced fish.
7, daily management. Microscopic examination twice a day, to observe abnormalities and gastrointestinal fullness abnormalities, and add water to the original water level. After feeding the egg yolks and minced meat pellets at the later stage of the nursery, the sewage suction work should be strengthened every day, changing the water once a day for 1/31/2 of the amount. After the pool is poured, salinity should be maintained once the water is changed and the pool is poured.
8, disease prevention and treatment. Use tools should be thoroughly disinfected. When polyprotozoa protozoa parasite. 0.2ppm malachite green medicine bath can be used for 0.5 to 1 hour or with formalin 35 PPM. 9, prawn desalination. When more than 90% of the larvae in the pool become metamorphosed into baby shrimp, they can be domesticated. Prior to desalination, the larvae of unaltered juveniles were removed and then a cage made of 40 mesh screen mesh was set up from one end of the inlet, and a plastic tube was inserted into the cage to siphon the drainage. Digestion of shrimps after 2.53 days should be maintained in the nursery pond for 3 to 4 days, and the water temperature should be adjusted slowly to the outside water temperature before entering the pond culture.
Zhejiang Industrial Group Co., Ltd. , https://www.xingyeseafood.com