Crucia carp: Stocking density: Cultivate crucian carp fingerlings in ponds, and stock 8,000-12,000 crucian carp summer flowers per mu, which can grow fingerlings with a size of 50-60 grams. Adult crucian carp is cultured in ponds, and 1,500-1,800 crucian carp fingerlings are stocked per mu, with an average size of 50-60 grams per fish, and adult fish with a size of 350-400 grams can be grown. Variety matching: The number of silver carp and bighead carp should account for about 10% of the number of crucian carp raised. If silver carp and bighead carp are released too early, it will affect the domestication of crucian carp. The best time to release silver carp and bighead carp should be after the main crucian carp has formed a habit of floating up to eat. Carp and grass carp have a short time to float up to grab food and are fierce in grabbing food. This will not only affect the domestication of crucian carp, but also affect the year-round feeding of crucian carp. Therefore, it is forbidden to mix carp and grass carp in the main crucian carp breeding pond. Acclimation: Adding an appropriate amount of phagostimulants (such as phagopeptides) to the feed can shorten the acclimation time and increase the feeding area and quantity of crucian carp. Pairing bream with caliber and feeding speed comparable to crucian carp can increase the success rate of domestication and shorten the domestication time. Crucian carp is easy to domesticate when the stocking density is high and the population is large. Feed usage: Use crucian carp seed feed when the weight is 50-100 grams, use crucian carp small fish feed when the weight is 100-200 grams, and use crucian carp adult fish feed when the weight is over 200 grams. This can not only maintain the normal body shape of the crucian carp, but also reduce the weight of the fish. The feed coefficient ensures the commercial specifications of adult fish.
Grass carp: In the past, conventional breeding of grass carp was mainly based on polyculture, and it took 3 years to grow. The cost was high and the capital was occupied for a long time. The author summarizes and promotes the pollution-free grass carp breeding technology with high yield, efficiency and rapidity, which is now introduced as follows. 1. Pond requirements: The pond area is preferably 10-20 acres, the water depth is 2-2.5 meters, and the silt thickness does not exceed 20 cm. Each 10 acres of pond is equipped with one aerator and one automatic feeding machine each with a power of 3 kilowatts. 2. Pond cleaning: Drain the pond water in winter and freeze and dry it for more than 20 days. Fifteen days before the fish are stocked, 10-20 cm of water should be introduced, and 150 kg of quicklime per acre should be used to clear the pond for disinfection. 3. Stocking of fish species: before and after the Spring Festival, stock 300 grass carp species per acre with a size of 200-250 g/kg, 300 crucian carp species with a size of 15-20 g/kg, and silver carp with a size of 5-6 g/kg. 50 fish species and 10 bighead carp species. Before stocking the fish, soak and disinfect them in 5 saline solution for 5-10 minutes. 4. Feeding: mainly feed pellet feed, with a protein content of 28-32%, supplemented by green feed. Feeding follows the principles of "coarse first and fine second" and "four determinations and four observations". It is generally fed twice a day. It is advisable to eat it within 2 hours and make the grass carp 80% full. From March to June, mainly feed pellet feed with a protein content of 28, with a daily feeding rate of 3, and an appropriate amount of green feed; from July to September, control the amount of pellet feed, with a daily feeding rate of about 1.5, and pellets. The protein content of the feed is 28%. Increase the amount of green feed to control the occurrence of fish diseases; feed pellet feed with a protein content of 32% from October to November. After continuously feeding pellet feed for a period of time, the pellet feed should be stopped for 1 week, and raw grain feed should be fed during the interval. Pay attention to adding appropriate amounts of vitamins and other drugs to the feed to prevent grass carp from suffering from diseases such as hepatobiliary syndrome and causing a large number of deaths. 5. Water quality management: Use the aerator correctly. On sunny and windless days from June to October, turn it on to increase oxygen for 2 hours every day from 1 to 3 pm, and increase oxygen at the right time in the early morning. On continuous cloudy days, oxygen should be added in advance. Add new water to the pond in a timely manner, and adopt the method of "small discharge, small inlet, and multiple water changes" to gradually control the water quality. From June to September, add new water every 3-5 days, about 10 cm each time. Every 15-20 days, use 10-20 kg of quicklime to slurry the entire pool at a depth of 1 meter per mu of water surface. . 6. Disease prevention and control: adopt the feeding method of "coarse at first and fine at the end, fine and green at the end" to control the occurrence of grass carp hepatobiliary syndrome. Common diseases of grass carp include red skin disease, gill rot, and enteritis. Treatment methods generally adopt a combination of oral administration and external application. The external application mainly uses disinfectants such as bleaching powder and chlorine dioxide for 3 days; oral administration uses "three yellow powder". "The effect of medicinal bait is better. For every 50 kilograms of fish weight, use 0.3 kilograms of three yellow powders (50 rhubarb, 30 phellodendrons, and 20 skullcaps, grind them into powder and mix well), mix them with the flour paste, mix them into the feed, and feed them for 3 consecutive days. -5 days.
7. Timely fishing: Timely fishing of large-sized adult fish for sale is an important measure for high-yield grass carp breeding. The main purpose is to reduce the fish carrying capacity of the pond water body and promote the rapid growth of pond fish in the later period. Catching is usually done once at the end of July, in the early morning when the water temperature is low.
Silver carp: It is very easy to raise. Generally, it is enough to fertilize to maintain enough algae in the water body for it to eat. You can feed some bean dregs appropriately, but not too much, which can easily deteriorate the water quality.
Carp:
Selection and breeding of parent carp
﹙1﹚ Selection criteria: good body shape, strong mobility without injury, ratio of body length to body height The ratio is 3:1, which is typical of the variety. Female fish should be at least 2 winter years old and weigh 1.5kg, while male fish should be at least 2 winter years old and weigh more than 1kg. Carp in the first sexual maturity and aging stages have poor egg quantity and egg quality, so they are not suitable for broodstock.
﹙2﹚Gender identification: Non-reproductive season: Female fish has a wide body, high back, small head, larger and soft abdomen, small and wide pectoral and ventral fins, flat or slightly protruding cloaca, and radial folds. ; The male fish has a long and narrow body, a larger head, a small and hard abdomen, large and long pectoral and pelvic fins, anus slightly concave inward, and no parallel wrinkles. Reproductive season: The abdomen of female fish is soft and sac-shaped, and the anus and genital pores are larger, slightly red and protruding; the abdomen of male fish is smaller, and the gill cover, chest and pelvic fins have obvious secondary sexual characteristics of "star chasing", and the anus and genital pores are It is concave, not red or swollen, and milky white semen flows out when the abdomen is gently pressed.
﹙3﹚Raising and management: The broodstock breeding pond is 1-2 acres, the water depth is about 1.2 meters, sheltered from the wind and sunny, easy to fill and drain, 150-200kg per acre. During artificial breeding, in order to prevent them from mating and producing offspring on their own The eggs should be separated from the male and female. Use quick lime or bleaching powder to disinfect before placing. To strengthen the breeding of parent carp, high-protein feeds such as bean cakes, silkworm pupae, and fish meal can be fed. In recent years, some manufacturers have developed broodstock feed, which is rich in ve and other vitamins, can promote development and improve anti-stress ability, and has good effects. At the same time, pay attention to adjusting the water quality during the feeding process, frequently adding fresh water, and maintaining micro-flowing water to stimulate gonad development.
2. Inducing labor and hatching
﹙1﹚Timing of inducing labor: When the water temperature rises and stabilizes above 16℃, labor can be induced. Usually during the Qingming Festival to Guyu period, after the cold wave, when the temperature rises and stabilizes, labor can be induced.
﹙2﹚Method of inducing labor: Artificial inducing labor: more common in fish farms a. Injection of oxytocin: artificial chorionic gonadotropin (hcg) 600-1000iu or luteinizing releasing hormone per kg of female fish Analog (lrh-a) 30-50 micrograms, or reduce the amount and mix it, and reduce the dose for male fish by half. Generally, at 6 pm on a sunny day, a predetermined dose is injected into the chest cavity at the base of the pectoral fin, and then moved into the spawning pool, and fresh water is added for half an hour. The water temperature is 18°C ??and eggs can be produced in 6-15 hours (the higher the water temperature, the The shorter the effect time, the opposite is true). b. Spawning and fertilization: The broodstock after induced labor can lay eggs on their own in the pool. If artificial eggs are collected, the fish can be picked up before the climax of estrus, wipe the water from the fish body with a towel, squeeze the eggs into a dry porcelain basin, quickly squeeze in the semen, stir it with feathers to allow it to be fully fertilized, and then fertilize it The eggs are evenly spread on the fish nest and placed in the hatching tank for hatching. Or use talcum powder solution to debond and then incubate in running water. When the water temperature is 16-22℃, seedlings can emerge in 3-5 days.
﹙3﹚ Management: a. Natural hatching: 300,000-500,000 fertilized eggs are placed in each acre of pond. Eggs on the same day should be put in together to ensure that the fry are neatly sized. Special attention should be paid to preventing saprolegnia. Fish nests with eggs attached can be soaked in 0.3‰ formaldehyde or malachite green in advance. b. Debonding hatching: The key is to adjust the water flow rate so that the fish eggs do not sink but are suspended in the water. At the same time, prevent sand windows from being blocked. When the fry hatch, slightly reduce the flow rate to prevent the water from flowing too fast and consuming the fry's physical strength. Improving the hatchability rate is the key to artificial reproduction. The main reasons that affect the hatchability rate are sudden weather changes during the spawning period, poor water quality, low dissolved oxygen, fish eggs being parasitized by mold, etc. We should try to prevent the harm.
Seedling cultivation
﹙一﹚Summer flower cultivation
1. Pond preparation: choose 1-2 acres, water depth 0.8-1.2 meters, less silt, The east-west fish pond should be cleaned and disinfected according to conventional methods.
2. Fertilization (also known as fertilizer water in the pond): 7-10 days before the fry are put into the pond, fermented manure can be applied, such as 150-300kg/acre of pig and cow manure (about 5 picks) , you can also apply 5-10kg/mu of inorganic fertilizers (chemical fertilizers, phosphate fertilizers, etc.), and perform quicklime disinfection at the same time (150kg/mu). One week later, the fry will enter the pond, which is the peak period of rotifers. The fry will have sufficient palatable food and grow vigorously.
3. Release fry: Before releasing fry, use a dense mesh to empty the net to remove wild impurities. You can also release 50-80 cheap silver carp seedlings to test the water, and then you can prove that everything is safe. Release fish, 100,000-250,000 fish/acre.
4. Clear water in the pond: Put the fry directly into the pond without applying base fertilizer. In this method, there are less rotifers in the water as palatable bait, which is not enough to eat. Therefore, the fry are weak and the survival rate is also low.
5. Management: (1) Timely feeding: After the fry enter the pond, they grow very fast in the first few days, and there is often a shortage of natural bait, so pay attention to feeding. It is commonly used to mix soybeans with cooked egg yolks into a pulp and pour them into the feed. Grind 2-4kg of soybeans and 3-5 cooked egg yolks per acre into a slurry every day and pour them immediately for feeding, focusing on the water surface a few meters near the edge of the pond. You can also pour filtered fresh pig blood every three days. Some of the soy milk can be directly eaten by the seedlings, or it can fertilize the water and enrich the natural bait. Currently, there are also fry feeds circulating on the market, which are shaped like microcapsules or powder and can be fed from 6 to 8 minutes. It can not only supplement food, but also induce the fry to grab food, thereby promoting the development of the digestive tract and helping to increase the survival rate. and strong seedlings. (2) Top dressing and water management: Apply top dressing every three days to keep rotifers in the water at a high level. You can also pump part of the water from the fatter adult fish pond every day and add it to the fry pond, which can not only increase the natural bait for the fry, but also prevent the occurrence of air bubble disease caused by excessive water in the adding machine well. The water should be changed 1/3-1/2 every week. (3) Careful observation: Inspections should be strengthened during the fry cultivation process. Observe its activities, feeding, growth, changes in water quality, and whether there are predators, diseases, etc. At the same time, the fry should be divided into pools at a timely manner to prevent uneven sizes caused by overcrowding. If necessary, it is necessary to pull the net to exercise the fry and increase their endurance.
﹙Two﹚Specification fish cultivation: After cultivation with summer flowers, the body length and weight of the fry have increased many times, and their adaptability has also been greatly enhanced. The changes in food habits have become the characteristics of the species, and they have begun to like concentrates. Therefore, there should be a smooth transition to eating compound feed as soon as possible. Breeding methods are:
1. Monoculture method: Choose 2-4 acres, water depth 1-1.5 acres, sterilized pond, release 3000-6000 summer flower fingerlings/acre, and feed in combination Feed or a mixture of bean cakes, silkworm pupae, and fish meal requires feed protein of more than 35%, 8-12 times a day, and a feeding rate of 5-8.
2. Polyculture method: Polyculture carp summer flower with other fish species, carp can be the main one or supplemented. If carp is the main species, the feed should be strengthened. If silver carp is the main species, the water quality can be properly cultivated. If grass carp is the main species, the carp should be released less.
3. Feeding and management: (1) The earlier the fry open for food, the earlier they start to grow, and the better they will grow. We should strive to make a smooth transition to feeding with full-price compound feed as soon as possible. (2) Pay close attention to the early stage of the flourishing fish species (especially within the period of 25-30 inches), which grow very fast, increase in body length and weight quickly, and require more feed. Feeding should be strengthened at this time. Some fishermen The feeding rate in this period exceeds 10. (3) Feeding adheres to the "four determinations" of fixed quality, timing, positioning and quantification, and feeds according to the feeding rhythm of fish species. (4) In daily management, "three inspections and four inspections" should be carried out in the morning, noon and evening to understand the climate, fish conditions and illness, and maintain the rapid growth of fish. At the same time, regular water injection and flood prevention and escape prevention should be carried out.
3. Adult fish breeding
Carp is widely distributed and has many breeding methods, such as ponds, cages, running water, fences, rice fields, mountain ponds and other breeding forms. Our county The most common method is to stock fish fillets at the beginning of the year, sell fingerlings in the middle of the year, and grow fish in the second half of the year. It has the characteristics of small investment, high output and high profit.
﹙1﹚Pond culture model. The size of the fish pond is not limited, and the water depth is 1.2-2.5 meters. From February to April, 3-5 cm carp species of the same size are put into the pond at a density of 5,000-7,000 fish per acre, and mixed with a certain proportion of grass carp and crucian carp. , silver carp. This model mainly feeds compound feed with a crude protein of more than 30, 2-4 times/day, and a feeding rate of 3-8. Its management points include the traditional "water, seed, bait, density, mixing, rotation, In addition to the eight-character essence of "prevention and management", there is also a new "cross" policy: quality seeds, refined materials, good water, and meticulous management. Although the first six characters of the new "cross" policy are similar to the experience of the old "eight characters", the new era should include new content, either strengthening or supplementing. The emphasis here is on fine management, which requires the breeding and management personnel not to neglect any link. Even if it is a penny of investment, the output must be calculated. Only in this way can high efficiency be guaranteed. After raising them in May, large-sized fish species will be sold in batches, gradually reducing the number of carp in the pond. By August, after the number of carp in the pond is reduced to about 1,000-1,200 per acre, they can be raised until they are released from the pond. On the market, the general yield per mu can reach 1500-2500 kilograms.
﹙2﹚Shanbapond breeding model. The general stocking proportions of grass carp and carp in mountain ponds are 60% (the proportion of the two can be freely chosen), white silver carp 30%, and crucian carp 10%. The size of carp is 0.1-0.4 kg, and the stocking amount per mu is 100-250 kg. Feed the compound feed, put enough at one time, and use a trap net to catch the big ones and leave the small ones.
4. Fish disease prevention and treatment
﹙1﹚Pox disease. Symptoms: In the early stage of the disease, there are small milky white spots on the body surface of the fish. As the disease worsens, these spots spread to the whole body. There are milky white paraffin-like growths on the epidermis of the affected area. When the growths grow up, they fall off on their own, and new growths soon appear. This may affect the growth of the fish in some cases, or cause the fish to die in severe cases. Cause of disease: Caused by herpes virus. Epidemiology: It mainly harms carps of one age and above. Autumn fever occurs frequently, and it is not easy to cause death of fish. It mainly affects the growth. Prevention and control: ① Thoroughly disinfect the fish pond and strictly disinfect the fish before entering the pond. ② Use cyanomycin aqueous solution to soak for 3 days. ?
﹙2﹚ Boils. Symptoms: The skin and muscle tissue on the back become inflamed, and then ulcerate into abscesses, and the hands feel swollen. The area around the abscess becomes inflamed, congested, and hyperemic, the fin rays are eroded into a brush shape (also called broom fins by fishermen), and in severe cases, the intestines bleed and become inflamed. Cause of disease: Aeromonas furuncle type. Epidemiology: Commonly seen in polyculture fish ponds dominated by white silver carp. There is no typical onset season. It can occur all year round. Prevention and treatment: ① Thoroughly disinfect fish species, water bodies, and ponds; ② Operate carefully to prevent fish injuries; ③ Use ciprofloxacin 80mg/kg feed to make bait for oral administration, combined with 1ppm bleaching powder for water disinfection, and use it for 3 days.
﹙3﹚Gill rot disease (commonly known as aconite plague). Symptoms: Wander alone, eat less, and have a black body color, especially the head. The gill filaments are rotten and filled with silt, the inner epidermis of the gill cover is congested, and the middle part of the epidermis is corroded into a round or irregular transparent window (also known as a skylight), and the gill filaments are rotten. Source of disease: Myxococcus fish. Epidemiology: Harmful to a variety of fish species, outbreaks are most likely to occur when the water temperature is 20-32°C. This disease is rare in winter and is often complicated by red skin and enteric diseases. Prevention and treatment: ① Disinfect the water with bleaching powder before the onset of the disease, especially in high-temperature seasons; ② Take erythromycin 100mg/kg feed or enrofloxacin 80mg/kg feed mixture orally; ③ Sprinkle disinfected pool water with oxytetracycline 0.1ppm.
﹙Four﹚Vertical scale disease. Symptoms: The body surface of the diseased fish is rough, and some of the scales (mostly at the rear of the fish body) expand outward like pine cones, so it is called pine cone disease; translucent or blood-containing exudate accumulates in the scale sacs, causing the scales to stand up. , so it is also called scale disease. Use your fingers to put a little pressure on the scales, and the exudate will spurt out from under the scales, and the scales will fall off.
Red ulcers form in the desquamated area, the eyes protrude, and the abdomen swells. Finally died after 2-3 days. The pathogenic water-forming Pleurobacterium punctata. Epidemiologically, this disease mainly harms carp, crucian carp, grass carp, and silver carp. The disease has two epidemic periods: one is the carp spawning period, and the other is the carp overwintering period; but generally late April to early July is the main epidemic season. The mortality rate reaches 45, with the highest reaching 85. Prevention and treatment: ① Fish injuries are the main cause of this disease. Care must be taken when pulling the net and other operations to prevent fish injuries. ② Disinfection of fish bodies, water quality and ponds. ③ Use 50-80mg/kg feed oxytetracycline or chlortetracycline to prepare erbium for feeding.
﹙5﹚Enteritis. Symptoms: Commonly known as intestinal rot. The abdomen of the sick fish is enlarged, showing red spots, and the anus is red and swollen like a volcano. In severe cases, the fins are also eaten away and broken. When the belly of the fish is cut open, it can be seen that the abdominal cavity has water accumulation and the intestinal wall is congested and inflamed. In mild cases, only the foregut or hindgut will appear red, and in severe cases, the entire intestine will appear purple. There is generally no food in the intestine and contains a lot of light yellow mucus or blood pus. . Pathogen: Enterotype Aeromonas punctata. Epidemiology: It is very common among grass, green and carp, and the mortality rate is very high. The general mortality rate is around 50. This disease can show two obvious epidemic seasons in a year, with more occurrences from May to June and August to September. . This disease often co-occurs with bacterial gill rot. Prevention and treatment: ① Treatment with sulfaguanidine: 1 gram for every 10 kilograms of fish eaten on the first day, and halve the dosage on the 2nd to 6th day. ② When treating enteritis and gill rot, sprinkle 2-3 ppm gallnuts throughout the pond, and feed furazolidone bait for 6 consecutive days. The dosage is 100 mg for 10 kg of fish per day; when the condition is serious, double the first dosage of furazolidone. ③Feed 50 grams of garlic for every 10 kilograms of fish, once a day for 3 days. ?
﹙Six﹚Skin mold. Symptoms: When the fungus first becomes parasitic, no abnormality can be seen in the sick fish with the naked eye. When visible to the naked eye, the hyphae have invaded the fish body wound and grown inward and outward. When the injury is deep, the fungus can penetrate deep into the muscle and spread. The hyphae that grow outward into the spaces between tissue cells look like gray-white cotton wool, so they are called "hairy or white hair disease". After the fish body is stimulated, a large amount of mucus is secreted. The sick fish becomes restless, moves abnormally, and causes friction with other objects. In the future, the fish will be overburdened, the muscles in the affected area will rot, the sick fish will move slowly, lose appetite, and eventually die. This disease also often occurs during the hatching of fish eggs. On the injured fish eggs, hyphae can be seen adhering to the egg membrane, and the hyphae outside the egg membrane are clustered in the water, so it is called "egg disease". The parasitized fish eggs are also called "sun seeds" because of their radial hyphae. Pathogen: Saprolegnia and Paecilomyces fungi. Epidemiology: This disease occurs throughout the year and is prevalent in all fish farming areas across the country. This type of fungus is not strictly selective for its host, and all kinds of farmed fish, from eggs to fish of all ages, can be infected. The fish egg hatching season generally begins in spring when the water temperature rises to about 18°C. The water temperature at this time is most suitable for the growth and reproduction of saprolegnia. After the broodstock spawns, Saprolegnia grows and reproduces on unfertilized fish eggs. Under suitable conditions, it continuously reproduces asexually to form zoosporangia. A large number of zoospores are released to infect fertilized fish eggs, so germinated mycelium can often be detected under the microscope on fertilized fish eggs. In the early stages of infection, the embryonic development of infected fish eggs can still proceed normally. However, in the later stages, when the hyphae enter the interior or the egg membrane is completely surrounded, and the eggs are seriously infected by saprolegnia near dead eggs, Affected, fish egg embryos die midway through development. Especially on cloudy and rainy days, when the water temperature is low (15-20℃), it is very easy to occur and spread rapidly, causing a large number of fish eggs to die due to infection with saprolegnia. Prevention and treatment: ① Use quicklime to clear the fish pond to reduce the occurrence of this disease. ② Be as careful as possible during fishing, transportation and stocking to avoid injuring the fish. At the same time, pay attention to reasonable stocking density to prevent the occurrence of this disease. ③Do not collect injured fish as broodstock; before the broodstock enters the pond, apply an appropriate amount of sulfonamide ointment to the fish body. ④ When the disease develops, 0.15 to 0.2 ppm methylene blue can be sprinkled throughout the pool. ⑤ Prevention of saprolegnia in fish eggs: First, efforts should be made to increase the fertilization rate and control spawning under good weather conditions; secondly, incubating eggs on fish nests with water can reduce or interrupt the impact of saprolegnia spores on fish. The chance of infection of the eggs can lead to a higher hatching rate.
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﹙Seven﹚Carp stupid disease. Symptoms: No obvious changes in mild infection. In severe cases, the intestinal tract may be blocked, causing inflammation of the intestinal mucosa and anemia, and occasionally death. Pathogen: Carpio tapeworm. Epidemiology: It mainly harms adult carp and crucian carp, and is most common from April to August. Prevention and treatment: Oral administration of trichlorfon mixture.
﹙Eight﹚Carp hysterophilic nematode disease (also known as red thin threadworm disease). Symptoms: The scales are loose, and the muscles around the scales are congested, inflamed, and ulcerated. It is easy to cause the complications of saprolegnia. There are irregular red-purple patterns under the scales where the insect is parasitic, and the red body of the insect can be seen when the scales are lifted. Pathogen: Cyprinus uteriphila. Epidemiology: It mostly harms adult carp. In winter, the worms live under the scales, but the worms are smaller and do not show disease. When the water temperature warms in spring, the growth of the worms accelerates and the fish become sick. Prevention and control: ① Strictly disinfect with quicklime to kill larvae. ② Use iodine sprinkler or 1 cup of potassium permanganate to scrub the affected area, or soak with 2 cups of salt water for 10 to 20 minutes.
Silver carp: 1. Preparations before stocking: The area of ??the fingerling pond is required to be relatively large, usually 4-8 acres, and the water should be deep, usually 1.5-2 meters. Organic fertilizer should be applied for cultivation before stocking, and base fertilizer for silver carp should be applied in an appropriate amount to control trichophytes from entering the pond during the peak period.
2. Stocking of summer flowers: The stocking time is generally from May to June. There are two ways of stocking: monoculture and polyculture. Polyculture is generally used because the habits of fish gradually show different effects at this stage. The external environmental requirements are also different. Mixing and breeding according to the habits and adaptability of various fish to water quality not only gives various fish a suitable growth environment, but also fully utilizes the utilization of the water body and the need for food. More economical use. Fish fingerling ponds are usually mixed with 2-3 species. In this experiment, a few silver carp and carp were mixed.
3. Feeding and management: At this time, silver carp still mainly feeds on plankton. The pond water must be fertile and have a large amount of plankton. In addition to applying basal fertilizer before stocking, summer flower carp must also be fertilized after stocking. Green manure and cooked manure, combined with regular injection of new water, keep the water brown-green. When feeding artificially, pay attention to the "four determinations" principle, namely timing, positioning, quality and quantity, in order to improve the utilization rate of bait and reduce the bait coefficient. At this time, the quantity of bait should be smaller.
4. Daily management: Patrol the pond once every morning, observe the water color and fish dynamics, frequently remove weeds around the pond and rotten debris in the water, clean the food table and disinfect the food table and food. In order to protect the sanitation of the pond; the net inspection is not only beneficial to fertilize the water, but also facilitates the inspection of fish growth and fish diseases, so as to reasonably establish the feeding amount and fish disease prevention and control methods, and do a good job in preventing escape, theft and fish diseases and enemy pests.
5. Combined ponds and overwintering: In late autumn and early winter, the water temperature drops below 10 degrees and the fish no longer eat. At this time, the fish must be fished out and concentrated in a deeper fish pond to survive the winter. The idea is Stop feeding one week before pool merging, and choose a sunny day to pull the net out of the pond. When merging the pond, you must be careful and careful when pulling the net and operating it to avoid fish injuries and water mold during the winter. The water depth of the storage pond should be more than 2 meters. Sunny and leeward, with less sludge, the pond should be merging to prevent hypoxia when it freezes, and to avoid the danger of birds.