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7. Intestinal disease fish intestine congestion and inflammation, no food, severe intestinal pus filled, sometimes blood, sometimes yellow water, the whole bowel was purple, anal swelling, can cause a large number of deaths. Prevention and control: When the sewage clears the pond, keep the water quality clean; Feed the fresh feed, eat now; Add 3 to 5% of the garlic in the feed, feed for 3 to 6 days; Add 30 grams of furazolidone per 50 kg of feed (Prevention) , feeding for 6 days continuously. 8. Liver disease (hepatic steatosis) The fish is dark in color, darker in the head, shallower in the filaments, severely anemic, slow in swimming, and sometimes the dorsal fin is exposed to the surface of the water for spiraling motions, sometimes standing motionless in slow flow. The caesarean section shows the liver is yellow, yellowish white or light brown, and some of the congestive hardened, swollen or reduced. Liver cysts, yellow, translucent. Ulceration of the end of the bowel, with yellow mucus. Prevention and control: Feed nutrition should be comprehensive, no degenerate feeds should be fed, feed formulations should be changed, fresh vegetables and fresh animal feed should be fed, feeds with little or no fat and high carbohydrate content should be fed, and choline chloride should be added to the feed. Increase water flow, drain sewage and improve water quality. 9. Vitamin deficiency disease 1 deficiency VB1: manifested as loss of appetite, paralysis; cover outside, delay, loss of balance, slow growth, more alarm, increased mortality; 2 lack of VB2: manifested as lack of food, growth stopped, eyeballs Cover bleeding, eyeball or lens opacities, eye blindness, movement disorders, body darkening, increased mortality; 3 lack of VC: manifestations of spinal curvature, abnormal lid, skin, liver, kidney, gut, muscle bleeding; 4 lack VA: manifested as lightening, slow growth, anemia, loss of appetite, bleeding of the eyeball, orbital base, hepatic atrophy, and death; 5 lack of choline: manifested as anemia, prominent eyes, kidney, small intestine bleeding, abdominal enlargement , pale body, liver yellow, hypertrophy, increased mortality; 6 lack of VD: manifested as slow growth, increased mortality; 7 lack of VE: manifested as slow growth, eyeballs protruding, ascites, red blood cells fragile, temporal clubs Such as. Prevention: feed nutrition should be comprehensive, do not feed deteriorating bait; add all kinds of vitamin supplements in feed; increase water flow, drain sewage and improve water quality conditions; change feed formula, feed fresh vegetables and fresh animal feed. III. Summary Rainbow trout rearing under brackish water conditions always adheres to the principle of “prevention as the main and prevention as the emphasis; the morning and evening patrols and feeds, observe the fish’s feeding, body color, growth, etc. Status; abnormalities should be identified in a timely manner to identify the reasons for the right medicine; in the season of fish disease as much as possible to eliminate all kinds of hidden dangers, timely disinfection of clear pool, and make a good medicine to do prevention. In addition to medication should pay attention to: the amount of drugs can not be too large or too small, especially sulfa, potassium permanganate; feed drugs to mix well; disinfection before the pool must be clear, observe the disinfection when observed, prevent death of oxygen; prevent fish Produce drug resistance.
Breeding of rainbow trout disease in brackish water
The brackish water rainbow trout disease prevention technology Rainbow trout is a wide salt, cold water fish. Because of its delicious flavour, suitable for low-temperature water-feeding, high yield, and high economic efficiency, it has become the most widely distributed species in the world. However, the death caused to the fish farmers due to illness is very high. First, the cause of the disease and control measures Environmental conditions: Fish pond structure is irrational, there is a dead angle, resulting in poor water flow; lack of water injection, high stocking density, poor water-soluble oxygen status of the pool; fish excrement and residual baits, etc., are not cleaned in time, the water environment deteriorates, and water quality Pollution. As the environmental conditions deteriorated, the fish were uncomfortable, the appetite and disease resistance weakened, and the chance of infection was enhanced. The prevention and control measures are to make the structure of the fish pond reasonable, smooth water flow, suitable breeding density, and no accumulation of dirt at the bottom of the pool to keep the pool clean and sanitary. 2. Feed feed deteriorates, deteriorates, fat oxidizes, molds develop, feedstuffs have a single feed nutrient insufficiency; feeds lack vitamins and substances that destroy vitamins; feedstuffs and finished products are processed with pathogens; feeding with pathogenic bacteria feed. The quality of feed is the key to good or bad aquaculture. Therefore, prevention and treatment should pay attention to feed hygiene, not bad, not a single comprehensive nutrition, processing technology is reasonable. 3. Pathogens; There are three main possibilities: First, the fish itself into; Second, feeding into the fresh feed; Third, water pollution in the water body with pathogens. The prevention and control measures are to do a good job of preventing epidemics and prohibiting the introduction of pathogens. 4. Others; Raf nets carelessly wounded the fish, use bacterial carriers to invade the bacteria, litter the diseased fish, give baits untied, overfamine, etc. Prevention and control measures are to strengthen management, strict operating procedures, regular disinfection, eliminate all hidden dangers. Second, common diseases and their prevention and control 1. Bacterial rickets: Sick fish swim slowly on the surface of the water or at the outlet, not eating, and severe cases do not go. Examination of the palate revealed that there was a marked increase in mucus, which became lighter. In severe cases, the bacteria covered the surface of the palate, causing the palate to stick into a stick and lose its normal breathing capacity. Prevention: 1/2000 cupric sulfate bath for 30 seconds; 1/10,000 cupric sulfate bath for 5 minutes; 1mg/L furan bath for 1 hour. Only one method can be used for the above three methods, and repeat once for 3 to 4 days. 2. The tummy of a large belly has expanded to a certain degree of death. After dissection, most fish bladders are filled with water, kidneys have stones, and a few gastric locomotives struggle for mucus, sometimes with yellow rice in the intestines. Prevention: Increase the flow of water and clear sewage in time. Increase the variety of feed: spleen, liver, eggs and so on. 3. The third generation of worm disease fishes are left alone on the bottom or out of the colon, often grinding their bodies sideways, affecting eating. Observe the ankles, the swollen swollen eyes, the lids cover the outside, and the silk dark black. The body of the fish is thin and dark, and the body surface mucus is a piece of gray velvet. Prevention: 1/4000 formaldehyde disinfectant bath for 1 hour; 90% crystal trichlorfon 1.5mg/L bath 30 minutes; malachite green 1mg/L bath 1 hour, or use 2mg/L bath 40 minutes. 4. There are many small white spots on the body of the small melon worm disease, ie, pus. At the entrance to the cluster, irritable, breathing difficulties, loss of appetite, and death in large numbers. Prevention: 1/4000 formaldehyde bath for 1 hour, can be a week, see the improvement stopped; malachite green 0.3 ~ 0.4; mg / L stop splashing, 2 hours after the return flow, once every Other day, three consecutive times a good effect. 2 mg/L malachite green and 1/4000 formaldehyde mixture bath for 40 minutes once every two days for three consecutive times. 5. When the rotten fin disease fishes are infected, the epithelial tissue of the dorsal or caudal fins and the outer edge of the pectoral fins is grayish, and then the base fins expand and the final fins are scattered and incomplete, which seriously affects the eating and even death. Prevention: 1/2000 cupric sulfate bathing for 30 seconds; 1 mg/L furanide bathing for 1 hour; 0.1% furanones mixed in feed for 4 days; feed plus 1% phospholipid or vegetable oil. 6. Saprolegnia spp. When the water-injury fish body is injured, it spreads into a piece of discoloration, causing swimming disorders, loss of appetite, and thin death. Prevention: Water quality should be clean; 2mg/L malachite green bath 20 to 40 minutes; Salt water bath: juvenile 1% concentration, 20 minutes, adult fish 2.5% concentration, 10 minutes.