What's the matter with the eel spitting blood?

A, the construction of the eel pool 1. Cement pool area of 30 square meters to 50 square meters is appropriate, the pool surface and the bottom should be polished smooth, so as not to eel in the activities of the skin abrasions caused by a variety of bacterial, viral infections, the top of the pool should be higher than the level of about 30 centimeters and set up a natural overflow outlet, the outlet is fixed with a mesh to avoid the eel to avoid escaping. Cement pond eel farming is divided into soil and soil-free two culturing methods, both of which should be planted water peanuts or water hyacinth, in the hot season to regulate the water temperature and for eels to rest, can be planted full of pools only to leave a small portion of the mouth of the food. If there is soil culture to lay 20 cm ~ 30 cm of soil is appropriate, the mud layer above the water level to maintain 20 cm ~ 25 cm is appropriate, the water is too deep in the activities of the eel to consume too much energy, too shallow is easy to turbid water and water temperature changes; if it is not soil culture water level to maintain 30 cm ~ 40 cm is appropriate, the superiority of the breeding mode is good water disinfection, and soil culture, disinfection, disinfection of the drug power It is difficult to act to the soil, the bottom, and easy to grow a variety of parasites and their intermediate hosts, such as leeches, flat-leafed snails, vertebrate solid snails, etc. 2. paddy farming first paddy soil dug up, buried on the nets and then put the soil back to the nets, the corners of the nets are fixed, planted with water peanuts or water hyacinth, the area of 20 square meters to 30 square meters is appropriate. In the net box should not be planted in rice and other root rough, developed crops, because the eel has a habit of drilling soil, easy to bruise the epidermis.3. Various ponds, lakes, reservoirs, net culture that is the net box soilless aquaculture, the area of 15 square meters to 20 square meters is appropriate, so that it is easy to disinfection, treatment of disease, the onset of the disease can be directly put into the net box and the fish with the large disinfection containers. The net box should also cultivate aquatic plants such as water peanuts or water hyacinth for eels to rest. The above modes of culture should not be too large, too large is easy to cause eel size differences in the breeding process, not conducive to growth. Second, the selection of seeds should be chosen yellow and black spots large and dense eel species, this kind of eel species grows fastest; yellow, spots small and irregular growth in general; yellow-black growth slower; and black or green-black growth slowest, but this kind of seedling is relatively more ferocious. When choosing seedlings, care should be taken not to choose seedlings that are injured, electrically beaten, fished or set, but healthy, vigorous, strong swimming ability against the water, and rapid response to gently touching the end of its tail. When choosing seeds, you should choose the same size and specification of the seedlings, because eels have the phenomenon of mutual cannibalism, especially in the lack of bait is very easy to happen. Third, the water temperature, ph value on the eel's impact on the eel is very sensitive to changes in water temperature, suitable for the growth of water temperature of 15 ℃ ~ 30 ℃, 28 ℃ when the strongest activity, fast growth, bait utilization rate. During this period of time, attention should be paid to the feeding of feed, so that the eel is full. When the water temperature is lower than 15 ℃ eels do not feed, enter the hibernation state. So in the north of the river, when the water temperature is not stable in April, do not add water to the pool and bait eels out of the hole, so as not to cause eel disease due to large changes in water temperature. Eels can be wet overwintering method, the method is: first put the water dry, keep the soil wet, cold and snow can be added a layer of straw or hay and other insulation to prevent freezing; can also be used in deep water overwintering method, but there is a drawback, the next year when the weather warms up eel activity will be out of the hole in the search for food, but the method due to the weather, the water temperature is not stable at this time eels are susceptible to diseases such as colds. pH is also known as that is the acid-base level. In the feeding process, if the dissolved oxygen is insufficient, the oxidation process is inhibited, the bait residue, organic matter, excreta and other gradual accumulation, decomposition is not sufficient, it will accumulate organic acid and make the pH value drop, affecting the growth of eels, so in the breeding process, we should pay attention to the change of fresh, clean water, because eels like clean water, usually pay attention to the frequent change of water and determination of pH, eels are generally suitable for living in neutral or weakly acidic waters (weakly acidic waters), eels are generally suitable for living in neutral or weakly acidic waters (weakly acidic waters). Eels are generally suitable to live in neutral or weakly acidic waters (pH value between 6.5 and 7.2), when changing water, pay attention to the weather and water temperature, each time you change the water to 3 cm to 5 cm is appropriate, it is advisable to slowly into the fresh water before slowly discharging the old water. The season of disease should also be handled accordingly. Because the water change too fast, easy to cause a big temperature difference, so that the eel cold. Fish pond management 1. Before stocking the fish pond disinfection disinfection time should be set in the fish before the stocking of about 10 days, because too late there may be residual toxicity of the fish pond, too early easy to re-enter the breeding of bacteria. In the disinfection of the pool water to maintain 5 cm ~ 6 cm high, with 90 grams / m2 ~ 120 / m2 of quicklime disinfection. The next day after disinfection, it is best to use a rake to stir the mud and lime milk once, so that it gives full play to its role in disinfection every 1 day ~ 2 days into the new water, discharge the old water. 2. Fry disinfection and stocking before stocking in order to determine whether the fish pool remains residual toxicity, can be used to 5 cm ~ 10 cm bighead carp or silver carp fry according to the 2 tails / square meter ~ 3 tails / square meter as a "test fish", if the fish activity is normal, the fish will be able to take the test fish, and the fish can not be used to test the fish. "If the activity of the fish is normal, the toxicity has disappeared, otherwise the stocking should be postponed. Before stocking the fry disinfection using salt 3% ~ 5% concentration immersion 10 minutes ~ 15 minutes, or 2ppm ~ 5ppm potassium permanganate, can eliminate some of the pathogens and parasites, increase resistance. Disinfection is best carried out in the shade, avoid sun exposure, time can be increased or decreased depending on the physical condition of the eel fry, to see whether the fry appear abnormal to determine, after disinfection into the water in the temporary rearing for stocking, stocking should be according to the specifications of the size of the pool, so as to avoid killing each other. It should also be noted that the water temperature of the temporary rearing pool should be comparable to that of the big fish pool (i.e. stocking pool), and the temperature difference between the two is not more than 3℃, if the difference is large, the water temperature should be adjusted appropriately. 3. feeding management and growth of eels in the pool for about a week to start adding part of the new water, and then every 2 days to 3 days to add water for 1 time, each time to 3 cm to 5 cm is appropriate to keep the water level at about 25 cm, and in the summer, when the day is hot, you can increase the number of water changes, to every release and discharge of water. The number of water changes can be appropriately increased in summer when it is hot, and it is appropriate to discharge 3 cm to 5 cm each time so as not to cause too great a temperature difference. Adhere to the daily inspection of the pool, found sick eels fished out in time to analyze the cause of the disease (sick fish generally do not enter the hole, swim and float in the water surface). Adhere to the intensive feeding, feeding to do regular, fixed point, fixed quality, fixed quantity. Usually, disease prevention can be used 1PPM bleach or trichlorfon 0.2PPM sprinkled in the whole pool (90% crystal type), disease prevention drugs should be prepared several varieties, and often change, so as to avoid pathogens to produce drug resistance. Eel growth fast or slow with the bait of the nutrient composition, type and quality has a great relationship, in the traditional culture of small fish, shrimp, earthworms, mussels, snails, etc., freshness is difficult to guarantee, easy to acidification and deterioration of eels susceptible to disease. Nutrients are relatively single, basically protein-based, and this introduction of wild fish and other protein content is not high. The digestive organs of eels are weak, and it is not easy to sour and spoil eels are prone to diseases. The nutrients are relatively single, basically protein-based, and the protein content of these wild fish and so on is not high. Eel's digestive organs are weak, not easy to digest and absorb, not suitable for eel's growth requirements. Especially chilled fish, mussels are not easy to digest and absorb, and very easy to cause enteritis disease. And feeding earthworms is easy to occur a variety of parasitic diseases. Because earthworms live in moist, fertile soil, and a variety of parasites also like to reproduce in this environment spawning, earthworms into the indirect infection of eels. In order to improve the economic benefits should choose a larger size of eel fry, in order to achieve the purpose of the year on the market, so the eel should choose to feed the nutritional comprehensive and easy to digest and absorb the full-value with the feed. Currently on the market there are three types of eel feed, namely powder, granular and expanded material, powder and granular material are inevitably easy to loose, pollution of water quality, not easy to observe the feeding situation, and other shortcomings, while the expanded feed floating water is good, high stability in the water, the degree of contamination of the water is light, easy to observe the feeding situation, and the expansion of the material in the expansion of the processing process of high-temperature sterilization, do not carry germs, is the breeding feed in the It is the preferred product in aquaculture feed. Farmers should choose good feed manufacturers and well-known brands to ensure product quality, the current market "Yinxiang brand" "Fuxing brand" of eel puffed feed has been recognized by the majority of farmers. The cause of hemorrhagic disease is unknown, is septic in nature, feeding earthworms eels are more likely to occur this disease, due to parasitic disease is very easy to secondary hemorrhagic disease and enteritis. (1) Symptoms: blood-like liquid in the mouth, upside down will flow out, more obvious after death. The body surface is covered with bleeding spots of different sizes, especially obvious in the abdomen, anus red, swollen, turned out to bleed, sick fish often surface deep breathing, Hubei local farmers called "vertical pile", constantly playing circle flip, cut open the belly, visible liver hemorrhagic enlargement, splenomegaly was purple, rectal hemorrhage. (2) treatment A, furazolidone 0.2ppm ~ 0.35ppm whole pool splash (using furazolidone original powder). B. internal flupirtation 5 grams / 100 kg of fish, mixing. C. tobacco 30 cm / mu depth of water, soaked in 250 grams of warm water for 5 hours ~ 8 hours of the whole pool splash. D. erythromycin 250,000 units of immersion in the sick eel. The above A, B can be used at the same time, A and C alternating every other day, used for 3 days ~ 5 days. 2. red skin disease (1) symptoms: the sick fish move slowly and weakly, the whole day will be the head out of the water, local hemorrhagic inflammation, there are red plaques, abdominal predominantly, serious epidermal rot, intestinal congestion and inflammation, and hemorrhagic disease is different from the difference is that it will not hit the circle. (2) Treatment A. 1ppm bleach solution splash the whole pool for 3 days. B. Erythromycin dipping and washing the sick eel. 3. Enteritis is mainly caused by feeding rotten and spoiled ice fish and mussels or due to underfeeding and excessive starvation. (1) Symptoms: slow activity, not feeding, body color greenish-black, emaciation, intestinal congestion, yellow mucus outflow, red and swollen anus protruding, severe purple. (2) Treatment: Usually use 5 kilograms of allicin or hot polygonum per 100 kilograms of fish for prevention. Every 100 kilograms of eel plus mint 3 kg ~ 4 kg of boiled water sprinkled 1 time / 7 days ~ 10 days. For treatment, every 100 kg of fish should be mixed with: A. 20 ml of human ten-drop water; B. 10 grams of sulphonamide quat × 3 days; C. 5 grams of haloperidol × 3 days to 5 days; 4. Capillary nematode and echinococcus disease can occur in most of the earthworms fed to the earthworms, and they are white elongated worms, which are prone to cause enteritis. (1) Treatment: A. 90% crystal trichlorfon 0.5ppm ~ 0.7ppm solution of the whole pool splashing, splashing should be prepared for sufficient water, because the eel is very sensitive to trichlorfon, improper dosage of the whole pool deaths, trichlorfon is forbidden to take internally. B. per 50 kg of eel with levamisole 5 grams ~ 7.5 grams × 6 days of internal or prothiocarbazole with the same amount of C. Copper sulphate + ferrous sulphate (5:2) 0.7 ppm Combination of whole pool sprinkling to kill parasites. 5. Trypanosomiasis is easy to cause anemia, big head. Use the same medication as (4) can be the same amount of immersion. 6. rotten tail disease is mainly due to insufficient bait, the same kind of residual food or self-mutilation, the fish will be picked up with erythromycin immersion or 1ppm bleach splashing. 7. coma is mainly due to the heat of the weather and high temperatures, shallow water caused by the amount of water can be added to the fresh mussels chopped and sprinkled into the pool, or fresh huckleberries chopped and sprinkled into the 8. cold water temperature is either high or low, or a large number of sudden changes in the water, caused by the fish body function Disorders, death, maintain the water level, reasonable water changes. 9. fever main density, hot weather, fish secretions in the water too much, oxygen consumption, water quality is not clean, bait residues or small fish, mussels not eaten did not fish out the odor. Prevention and control methods are A water change; B with 0.7ppm ketone sulfate splash or 25 kg of water 300,000 units of penicillin splash