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What are the sensory identification methods for fish diseases?
(1) Intestinal diseases 1. Hemorrhagic disease: The muscles, mouth, and bases of various fins are congested, especially the anal fin. After peeling off the skin, pinpoint hemorrhages in the muscles are visible; in severe cases, the entire muscle turns red. Sometimes the operculum, lower jaw, orbital area, and intestines of sick fish also show congestion; the gills lose their bright red color or become pale. 2. Enteritis disease: The anus is red and swollen; in severe cases, pressing the abdomen gently causes pus and blood or yellow mucus to flow from the anus, and part or all of the intestine is inflamed, appearing purplish-red. 3. Coccidiosis: The gill filaments are pale; in severe cases, the abdomen is slightly
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How can the disease prevention system be improved in soft-shelled turtle farming?
1. Build farming facility conditions that meet ecological requirements, including farming engineering facilities, water source and water quality management, and other aspects. 2. Implement scientific feeding management and daily operations, and use high-quality, complete, diversified feed free of pathogen contamination. 3. Select healthy seedlings for farming. As far as possible, breed hatchlings and young turtles locally, and at the same time try to avoid introducing seedlings from other places, especially imported seedlings, to prevent secondary infection by pathogens. Even if they are introduced, strict quarantine and isolation observation must be carried out.
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What are protozoan diseases in pufferfish?
Pathogen: Cryptocaryon irritans, with a spherical or oval body similar to Ichthyophthirius multifiliis, measuring 0.066-0.45×0.034-0.36mm, covered entirely with cilia and generally having four bead-like macronuclei. Epidemiology: Cryptocaryon irritans mainly parasitizes the gills, skin, fins and other parts of marine fish. It is prevalent in coastal sea areas from mid-May to August each year. The suitable breeding temperature for Cryptocaryon irritans is 20-25°C, and it is transmitted by *cysts and their larvae. Symptoms: First, a large number of small white spots appear on the body surface, and in severe cases
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Control Methods for Bacterial Gill Rot Disease (Flexibacteriosis) in Koi
I. Symptoms: The gills of diseased fish rot and carry some sludge. Sometimes the tissue at the tips of the gills rots, causing the gill edges to become incomplete and ragged; sometimes one or more spots on the gills rot, but not at the edges. The inner membrane skin of the operculum (gill cover) becomes congested, and sometimes breaks down and corrodes into a roughly circular transparent area, commonly known as "open skylight." Because the gill tissue is destroyed, the diseased fish has difficulty breathing and often swims near the water surface in a floating-head manner. In severely affected fish, the floating-head phenomenon persists even after changing to clean water. II. Pathogen: Cytophaga columnaris (columnar flexibacterium), synonym: Myxococcus piscicola.
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Cage fish disease prevention and control relies on these four services
Recently, it has been a season of high incidence of cage fish diseases. The fishery authorities of Ningbo City, Zhejiang Province, have carried out four services to comprehensively implement disease prevention and control work. 1. Science and technology outreach service. Disease monitoring reporters in each area regularly visit each monitoring point and surrounding cage aquaculture areas to learn about conditions. Municipal-level disease monitoring reporters are guaranteed to go to the grassroots to carry out services twice a week (1-2 days each time). 2. Rapid response service. If fishermen encounter sudden disease outbreaks, experts are organized to rush to the scene within 2 hours. Recently,
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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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Study on Aeromonas hydrophila disease in European eel
In recent years, large-scale intensive farming of European eel has been increasing in China. However, with the expansion of farming scale and the continuous increase in farming density, various problems affecting the survival rate of European eel have also been increasing, and the fulminant infectious disease of European eel caused by Aeromonas hydrophila as the pathogen is one of the prominent problems. This paper conducts a series of preliminary studies on the physiological and biochemical characteristics, pathogenic factors, and pathogenic conditions of Aeromonas hydrophila, aiming to provide a strong theoretical basis for the prevention and control of fulminant infectious diseases in European eel, and to better promote the development of the European eel farming industry toward stronger
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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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Comprehensive Prevention Methods for Two Common Summer Diseases in Pigs
I. Piglet coccidiosis: This disease occurs mostly in late spring and early summer, mainly affecting suckling piglets aged 6-15 days. Drug prevention and treatment: 1. Toltrazuril: Piglets are given a single oral dose of toltrazuril at 3-6 days of age, at 20 mg per kg of body weight. 2. Sulfonamides: The therapeutic dose of sulfadimidine (sulfamethazine) is 20-25 mL per kg of body weight, once a day for 3 consecutive days. II. Swine streptococcosis: It occurs mostly in the warm season from May to November and is a zoonotic infectious disease. Prevention: per ton of feed use
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Detailed Explanation of Control and Treatment Methods for Other Pig Diseases (Part Two)
(7) Anestrus Anestrus, commonly known as failure to come into heat, refers to gilts aged 6-8 months or sows that have still not come into heat 15 days after weaning. Prevention and treatment: 1. Strengthen management, pay attention to breeding pig nutrition, prevent breeding pigs from being too fat or too thin, and maintain good body condition; 2. For delayed puberty in gilts, transfer them to other pens or locations, increase contact with boars, and feed some green fodder. Also, a single subcutaneous or intramuscular injection of pregnant mare blood (blood from mares 40-80 days pregnant) 10-20 ml or PMSG (
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