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Detailed Explanation of Key Technical Points for Spring Broodstock Cultivation
After the beginning of spring, water temperatures gradually rise. Especially during the pre-spawning stage in March and April, fish activity increases, development accelerates, and food intake rises accordingly. This stage is an important period for gonadal development of broodstock. Practice has proven that the quality of spring broodstock cultivation is the key to the success or failure of artificial breeding of Chinese carp. Therefore, the following points must be well managed: 1. Feeding. Grass carp broodstock are mainly fed grass and concentrated feed. Depending on the availability of grass, generally grass is fed in the morning and concentrated feed in the afternoon, both on fixed feeding platforms. In early spring when green feed
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What are the precautions for stocking fish fingerlings in early spring? Farmers should keep these points in mind
1. Fingerling quality: The fingerlings to be stocked should be of the same species and same age, uniform in size, robust and uninjured, with intact scales and fin rays, strong upstream swimming ability, and after being removed from water, the gill cover should not open and the fish should keep jumping. 2. Fingerling disinfection: When disinfecting fingerlings, note: ① The medicine should be prepared and used immediately; use clean water to prepare the solution, avoid using fertilized water, and avoid direct sunlight when soaking the fingerlings in the medicine. ② The dosage must be accurate, avoiding insufficient or excessive medication. ③ The soaking time should be appropriate. If signs of poisoning appear in the fingerlings, immediately add water
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How to prevent disease when stocking fish in spring? A detailed guide to practical measures
In spring, as water temperatures rise, pathogens multiply easily. When stocking fish, besides choosing high-quality fingerlings of uniform size and without injuries, attention must also be paid to preventing disease. The main measures are as follows: Pond preparation and tool disinfection. Before stocking fish, weeds should be removed, excess silt cleared away, leaks plugged, and the pond bottom leveled. Then quicklime, bleaching powder, and other substances should be applied by broadcasting over the entire pond. Fishing nets, fish buckets, and other @#@233@#@ tools should be exposed to sunlight for about 2 days before use, or soaked and disinfected in high-concentration quicklime water, bleaching powder solution, and the like.
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Common Spring Fish Disease Prevention and Control Methods and Technical Key Points
1. Gill rot disease. Pathogen: Myxococcus. Symptoms: The diseased fish has a darkened body color, stays away from the school, and stops feeding. The gill filaments are rotten and covered with mud, the inner epidermis of the operculum is congested, and it is often corroded into round transparent small holes, commonly known as "open skylight". After grass carp gill lamellae are infected with Myxococcus, the tissue in the affected area shows varying degrees of rot, ulceration, and invasive hemorrhage. Cultured fish such as black carp, grass carp, and bighead carp can all develop this disease, especially causing the greatest harm to grass carp. Below a water temperature of 15°C, it is generally rare; it begins to become epidemic at around 20°C. Prevention: At a water depth of 1
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Key Technical Points for Spring Intensive Conditioning of Broodstock
Spring is a critical period for gonadal growth in broodstock. Whether broodstock are conditioned well or poorly at this stage directly affects the success or failure of artificial propagation of Chinese carp, so on the basis of routine conditioning, spring conditioning must be given special attention. 1. Adjust the water level of the broodstock pond and raise the water temperature. On sunny days, drain water promptly to lower the pond water level and speed up the rise in water temperature. The amount drained can be about 30 cm of water level reduction. When rainy days or cold air arrive, fill the pond in advance to slow the loss of heat from the pond water. 2. Strengthen feeding management and provide sufficient, high-quality feed and fertilizer.
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Methods and techniques for stocking fish fingerlings in early spring
Early spring is the best season for stocking fish fingerlings, because during this period the water temperature is relatively low, the fish's activity is reduced, and the fish scales are tight, the fish body is firm, and they are not easily injured during netting, catching and transport, which can increase the survival rate of stocked fingerlings. When stocking fingerlings, attention should be paid to the following aspects: fingerling quality - fingerlings of the same species and same age should be uniform in size, with little difference in body length and weight, thick back muscles, bright coloration, scales and fins intact without damage, swimming actively and normally, strong upstream-swimming ability, and after being taken out of the water and placed in a basin, the gill covers do not open and the tail
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What are the four key points to get right for fish farming at the start of spring?
1. Fertilization: In early spring, when the pond water temperature stabilizes at 8°C-10°C, start applying supplemental fertilizer to cultivate natural food organisms in the water. The amount of fertilizer should be determined according to the fertility of the water quality and the quality of the fertilizer. Generally, apply 60-90 kg of human excrement and urine per mu; or 100-150 kg of livestock manure. If chemical fertilizer is used, follow a nitrogen-to-phosphorus-to-potassium ratio of 1:1:0.5. When applying, first crush and mix with water, then splash evenly over the whole pond, with a total amount of 3-7 kg per mu, and an interval of 5-10 days between each application. Keep the pond water quality yellow-brown or yellow-green, with a transparency of 30 cm
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Detailed Explanation of Key Technical Points for Spring Broodstock Cultivation
After the beginning of spring, the water temperature gradually rises back up, especially during the pre-spawning stage from March to April, when fish activity intensifies, development accelerates, and food intake increases accordingly. This stage is an important period for gonadal development of broodstock. Practice has proven that the quality of spring broodstock cultivation is the key to the success or failure of artificial breeding of Chinese carp, therefore, the following points must be well implemented. 1. Feeding: Grass carp broodstock are mainly fed grass and concentrated feed. According to the availability of grass, generally grass is fed in the morning and concentrated feed in the afternoon, both of which should be fed at fixed feeding platforms. When green feed is scarce in early spring,
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Swine spring diarrhea is swine dysentery; early prevention and early treatment are key
Swine dysentery is an intestinal infectious disease caused by Brachyspira hyodysenteriae. It occurs mostly in growing pigs, with few cases in piglets and adult pigs. It spreads slowly, has a long epidemic period, a high incidence rate, and a low mortality rate, and can harm pig herds over the long term. Affected pigs pass feces mixed with large amounts of mucus and blood, often in a jelly-like form. Drug treatment for this disease is effective, but relapse is easy after withdrawal, making it difficult to cure completely. Drugs such as mequindox, berberine, bacitracin, olaquindox, and tetracycline can be selected for treatment. If the therapeutic effect is found to be poor, the drug should be switched as soon as possible.
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How to restore a weak ox's condition in spring? Sharing practical experience
1. Dissolve 200 g of white sugar or brown sugar per ox per day in an appropriate amount of warm water and give it to drink, continuously for 1 week. 2. Per ox per day, use 250 g of okara (tofu dregs), 50 g each of rice bran and wheat bran, and 10 g each of fishmeal and salt, mix evenly, and feed before grazing in the morning, continuously for 2-3 weeks, with remarkable results. 3. Use 100 g each of soybeans and corn, add water and grind them into a paste, then add 250 g of rice bran and an appropriate amount of salt, mix well, and feed once daily after the working ox finishes grazing, continuously for 1 week. 4. Cook
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