Pond angle fish breeding techniques

In recent years, due to the increase in consumer demand and the smoothness of export channels, the local pond culture has gradually become a scale in our county, and the aquaculture efficiency has increased significantly, which has become a new way for farmers to increase their income. In order to promote the scale-up and industrialization of local pond angle fish farming, I stationed the relevant technical personnel for many years of aquaculture production practice, summed up the technical experience of a large number of successful farmers, and is currently promoting farming throughout the county. Now we will introduce a simple introduction to the culture technology of local pond angle fish to guide the farmers to develop scientific fish culture and common development.
1. The living habits of local pond angle fish: survival temperature 7°C~38°C, optimum growth temperature 20°C~33°C, omnivorous, mainly animal feed, resistant to hypoxia, hi dark, gregarious burrowing, strong With regard to escape from the water, the wild population has a yellowish body color and spots on both sides. The artificial breeders have a light body color and are mostly gray and black.
2. Pond conditions: The pond ponds for local pond corner fishes are generally 333~1333m2 in water depth of 1.2~1.8m. Masonry around the ponds is to be solidly built with masonry mortar to prevent leakage and set in the diagonal positions of ponds. Drain outlets, and set the barrage, the water inlet is best to extend into the pond outside the pool 1m.
3. Pond facilities: Ponds that cultivate local ponds should generally have a water hyacinth or a shading shed. The area is about 3 to 5 m2. In addition, because the local pond corner fish is hi, it should be placed in the pond tile, bamboo or asbestos (from the bottom of the pond 20cm) take a few fish ponds for the pond corner fish habitat and shade, but do not put the bamboo, Pine forks and other objects (some of which were set up for theft) were thrown into the pond so as not to affect the normal activities of the fish.
4. Qing Tong disinfection: in the seed pond before the pond, dry pond or water 10cm, and then sprinkle with 75kg/667m2 quicklime watered, be sure to splash evenly throughout the pond, even the pond walls should be spilled. It is best to sterilize the pond for a few days before returning water to 50~70cm. After returning to the water for 7~10d, the pH can be determined to be ≤9 or the test water can be used to prove that the toxicity has disappeared.
5. Cultivating water quality: If fertigation ponds can be fertilized in front of the seedlings, and a large number of larvae, copepods, and rotifers are to be bred, then there will be sufficient live larvae after the seedlings in the lower pond, and they will eat fast and grow quickly. With strong disease resistance and high survival rate, the cost can be reduced by applying 300 to 400 kg/667 m2 of fully-fermented and decomposed livestock manure after 2 to 3 days of disinfection in the clear pond, and then impounding water. Normally after 7 days of fertilization, the growth of plankton in the water reaches a peak period. This is the best time for seedlings to be put in. After that, it is only necessary to apply 100kg/667m2 fertilizer every 5 days to continuously feed the fish with live fish until the fish. As long as the finger-like thickness, the period (about 25 ~ 30d) can not feed or only cast a small amount of formulated feed.
6. Fish stocking: The stocking density of the local pond is generally 1-30000/667m2, and the stocking density is too large to easily cause disease death, which directly affects the survival rate; secondly, it will lead to uneven feeding, and there will be differences in size, affecting yield and benefit. The third is that in the middle period of cultivation, the production capacity of the pond is often exceeded. The fish in pond corners only eats for a long time, and the breeding cycle is greatly extended. Fourth, the aquaculture investment is too large and the risk increases. Therefore, the pond culture of local pond angle fish should strictly control the stocking density. When laying the seedlings, it is necessary to select the species with strong physique, long shape, disease-free and uniform size, one-time investment, and avoid two groups of fish in the same pond. When stocking, pay attention to the temperature difference no more than 3°C, stocking size 3~7cm/tail, the larger the stock size of stocking, the stronger the adaptability to the environment, the higher the survival rate, the more than 100g per 667m2 can be used for squid and squid ( Commonly known as cockroach and squid) 100 tails. Most of the seedlings in my county are from the end of March to mid-October.
7. Daily management:
(1) Scientific Feeding and Feeding Initially, the feeding habit should be domesticated first by tapping the pond embankment with stones or iron before the feed, and then slowly feeding a small amount of feed, repeatedly and repeatedly until the sound of fish is heard. The conditioned reflexes are used to feed, which is conducive to improving the feeding rate and feed utilization rate, and reducing the feed coefficient and production cost. Daily feeding should be done with “four settings”: timing, fixed-point, qualitative, and quantitative. Practice has proved that ignoring the "four prescriptions" is likely to lead to lack of food for fish, and the prevalence rate is increased. In particular, the incidence of enteritis disease is mostly due to improper feeding or bait quality problems. The daily feeding amount (dry weight) accounts for 2% to 6% of the total weight of pond angle fish, which is divided into 2~3 feedings. The feeding rate should reach 6% in the seedling stage, and then the fish growth will gradually decrease to 2 afterwards. %, later available part of soybean meal, rice bran, cooked red eggplant, etc. instead of full-priced compound feed. Because Tong Kok fish is more gluttonous, it should not be fed too full, generally controlled in 20 ~ 30min finished eating, reaching 78% full on it.
(2) Anti-escape and enemies The local Tongjiao fish have anti-water escape properties and can easily escape from the water when it rains or when new water enters the pond. In production practice, it has been found that the inlet is 1m away from the surface of the water and that fish escapes. Therefore, it is advisable to extend the water inlet to a point 1m away from the pond. The pond water level should not be too high, especially in the rainy season, where conditions permit. Barriers should be set around the pond, with a net height of 50cm or more, on the one hand to prevent the escape of fish, and on the other hand to prevent the invasion of snakes, frogs and water mice.
(3) Classification of large and small fishes: Although the specifications are uniform at the time of seedlings, it is often the case that large and small fishes have a large difference after a period of culture. When they reach the ponds, small ones are only 25g or less and cannot be listed. This is mainly due to the inconsistent feeding of pond croakers, the stronger looting, the faster growth, the lesser looting or even the lack of access to food, the slow growth, and the formation of a vicious circle, especially after fish sickness, which will affect the development of fish. The benefits of fish. There are two ways to solve this problem: First, divide the ponds once a month and stock them by small and large fish ponds. However, this method is time-consuming and labor-intensive, and its operability is not strong; the second is to set aside another large limit at the food court. The method used by the fish to grab the fence is to first enclose it with fences of appropriate spacing according to the size of the pond horn fish, so that smaller fish can freely eat and eat, and then gradually increase the fence spacing as the fish grows. This method has a good effect in actual use in production.
(4) Fertilizing water injection: For ponds that feed local pond horn fish, blue-green algae grow easily in ponds due to frequent feeding of animal feed, resulting in deterioration of water quality. Therefore, water injection is one of the focuses of daily management work. Generally, the water depth is gradually increased to 1.2~1.5m with the growth of fish. The water depth of overwintering fish pond must reach 1.5m or more before it is safe, otherwise the water temperature will drop below 7°C. Was frozen to death. In the summer and autumn season, every 5~5d change the water 5~10cm, apply livestock manure 100kg/667m2 every 10d so that the color of the mung bean is green or dark brown, and the transparency is 25~30cm.
8. Prevention of Fish Disease: Wild pond angle fish are hardly affected, but artificial breeding has a higher density and is affected by the excretions of the fish itself and the fish inducing disease due to catching food and tearing. During the breeding process, we must always adhere to the principle of prevention, splash lime water once every 15 days, the dosage is 15kg/667m2, and feed oxytetracycline or ciprofloxacin bait for 2 days continuously, add 2 to every kilogram of feed. 3g. Found that fish disease should be treated promptly, the right medicine. If it is a disease caused by parasites, exterminators, trichlorfon, and poisonous insects No. 2 can be used to dilute the whole pool; if it is a bacterial or viral disease, fish can be used, fish fungus can kill stars, fish must be provided, and bleeding can occur. Equity drug feeding, if necessary, can also use chlorine dioxide, bromochlorohydantoin, diammonium iodine and other external disinfectants against the water Quanchiposa. The medication must be strictly in accordance with the instructions and relevant regulations, and it is not possible to arbitrarily increase the amount of medication, and it is even more difficult to use food and animal banned drugs and additives recently announced by the Ministry of Agriculture. Medication is usually continued for 2 to 3 days to achieve therapeutic effects. Do not be superstitious. "Professional medicine."

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