Common disease of spring fish such as rot disease and vertical scale disease
Chondroitin Sulfate,Pharmaceutical Chemical,Biological Products Pharmaceutical Intermediate Co., Ltd. , http://www.nspharmaceutical.com
December 19 02:02:23, 2018
The temperature in early spring is relatively large and the temperature has risen significantly. The pathogenic microorganisms (parasites, bacteria, viruses, and fungi) in the water have rapidly recovered and proliferated; and because of the multi-grazing and fish body frostbite during the winter, the disease has caused surface infection. In March, fish is susceptible to rot disease, vertical scale disease, brucellosis, hydromycosis, and small melon worm disease. Therefore, effective prevention and control measures should be taken to ensure the smooth progress of aquaculture production. I. Pathogen of bacterial gill disease: Fish myxobacteria. The bacterial body is slender, with uniform thickness, and both ends are blunt and generally slightly curved. Symptoms: The diseased fish is black in color, lives alone, and does not eat. There is a lot of mucus on the sputum and the sputum rots with mud. When the disease is serious, the cartilage at the end of the tantalum wire is exposed, and the epidermis of the sputum cover is congested. The central epidermis often corrodes into a round transparent hole, commonly known as "open skylight". The hemorrhoids are bleeding and rot. As the cricket tissue is damaged, the fish's breathing is difficult and causes death. Caenorhabditis communis infected with Myxococcus, caused by tissue lesions is not inflammation and congestion, but the lesion area of ​​the cell tissue showed varying degrees of decay, collapse and invasive bleeding. Hazardous objects and epidemic conditions: This disease may occur in farmed fish such as herring, grass carp, and squid, and it is a major hazard to grass carp. In the water temperature below 15 °C, generally rare. It has become popular around 20°C. Prevention methods: 1. Prevention: 1 ml deep water per acre is splashed with 50 ml of “Red Stealth†and used once every 15 days. The fish was added 0.5% to the feed and fed once every 15 days. The seedlings were diluted with the seed soaking agent at a rate of 1/5000 before stocking, and the medicinal bath for 3 to 5 minutes. 2, treatment: 1 meter water depth per mu with 100 ~ 125 ml "sterilization red" the whole pool evenly spilled, at the same time with the "fish recreation 2" better use. If the condition is serious or there is a fulminant disease, use "Yukang Le No. 1" to add 1.5% to the feed, 3 to 5 days for a course of treatment, and continuously feed until no dead fish increase. Second, the pathogen of vertical squamous disease: water-type point hairy bacillus Symptoms: sick fish surface roughness, part of the scales (mostly in the tail) open like a loose ball outward, edema at the base of the scale, the internal accumulation of translucent or blood-containing exudate Liquid, so that the scales are also falling off. And there are rotten fins, fins at the base of congestion, sometimes enlarged abdominal and eyeballs and other symptoms. Diseased fish swim slowly, breathing difficulties, the body reversed, the abdomen up, this state of death after 2 to 3 days. Hazardous objects and epidemic conditions: The disease mainly affects salmon, carp, grass carp and carp. It is popular every spring. Prevention methods: Prevention: (1) Each time after pulling fish out of the net in winter, immediately use “sterilization red†and splash the whole pool with a dosage of 50 ml per acre of water. (2) After defrosting, water of 1 meter per acre is splashed with 50 ml of “Red Stealthâ€. Treatment: 100-125 ml of water per meter of water depth per meter of "red bactericidal," the whole pool evenly spilled, when the condition is severe, use 2 to 3 times. In areas where fish have already been eaten, add 1.5% of the fish "Kangle 1" to feed for three days. Third, the pox sores pathogen: virus symptoms: the early stages of disease, the disease fish body surface appears many white dots, covered with a layer of white blocky mucus. With the development of the disease, the number of white spots continues to increase, and at the same time, the area of ​​spots continues to expand. As a result, the epidermis at the site of the lesion gradually thickens, forming paraffin-like growth organisms, and the shape resembles pox sores. Therefore, it is referred to as “acne diseaseâ€. . Acne sores grow naturally to a certain extent, and then new blemishes appear again in the original affected area, eventually causing the fish to lose weight and die. Hazardous objects and epidemic conditions: The 2nd instar carp, which mainly affects the wintering period before and after wintering in pond culture, usually occurs from autumn to early winter and spring, and the water temperature appears at 10~15°C. Due to the low incidence and the non-infection of other fish in the same pool, it has not attracted people's attention to this disease. In recent years, due to the vigorous development of high-density cage culture technology, the disease has become increasingly serious and the incidence has gradually increased. , Control methods: 1, After the spring, each meter of water depth per meter with 50 ml "sterilization red" or 200 ~ 400 ml (0.3 ~ 0.6ppm) of "efficient iodine sterilization" diluted Quanchiposa, once a week To control the amount of virus in the water. 2, after feeding the fish, in the feed to add 2 ‰ of the "ultra-concentrated photosynthetic bacteria" and 0.3% of high stability and easy to restore Vc, in order to improve the body's immune system. Fourth, the hydromycosis pathogen: water mould Symptoms: Saprolegniasis commonly known as white disease, skin mildew. When the aquatic fungus is initially parasitized, it is generally not possible to see any abnormalities in the diseased fish. When the disease is seen, the mycelium has invaded the wound of the fish and grows outward. If the fish is injured due to careless operation or transportation, cold damage is caused, or the original lesions are caused by parasites, bacteria, etc., the fungal spores invade from the wound of the fish and absorb the nutrients in the skin. Rapidly multiply, spread and grow into cotton-like hyphae. The hyphae and the wound tissue adhere to each other, resulting in ulceration and tissue necrosis of the skin. At the same time, as the area of ​​the lesion expands, the fish body becomes overburdened, the swimming is abnormal, the appetite decreases, the fish body is wasted, and finally the sick is dead. Hazardous objects and epidemic conditions: The disease occurs at temperatures below 20°C. In the low water temperature season, the disease is most prevalent in early spring and late winter. It occurs throughout the country. There is no strict selectivity for parasites from aquatic molds, and all farmed fish can be infected from fish eggs to adult fish. Cultivated overwintering pools, lean or starved fish in spring ponds are all susceptible to hydromycosis. Prevention methods: Prevention: Fish should be as carefully as possible during the pooling operation so as not to injure the fish. Before entering the pond, use the “fry seed soaking agent†to dilute at a ratio of 1/5000. After the medicine bath is re-introduced into the pool for 3 minutes, use “sterilized red†to splash water at a depth of 1 meter per acre for 50 ml. Avoid fish farming at temperatures below 15°C to avoid fish frostbite and abrasions. Treatment: 1 meter deep water per acre with "sterilization red" 100 ~ 125 ml Quanchiposa. Fifth, the pathogen of small melon worms: many small melon insects. Symptoms: When a large number of parasitic parasites, the naked eye can be seen on the surface of the fish, fins and gills covered with white dotted cysts, it is also known as "white spot disease." Severe infection, due to invading the skin of the fish and the epidermis tissue of the larvae, causing tissue hyperplasia at the lesion site, and secrete a large amount of mucus, forming a white film covering the lesion surface, while the fin lesion lesions appear to rot. Hazardous objects and epidemic conditions: This disease has occurred in all aquaculture areas in China. The worm does not have strict selectivity for the host and it is the most serious damage to the fingerlings of the year. No matter what kind of breeding waters it can infect the disease. Prevention: 1, before the stocking of 1 meter water depth of 1 meter with 50 grams of "fish kill 2B" 2000 times water dissolved Quanchiposa. The fish was added 0.5% to the feed and fed once every 15 days. Before stocking, the seedlings were diluted with 1/5000 of the seedlings for 3 to 5 minutes. 2, when the disease occurs with 50 grams of fish killed 2B2000 times dissolved in water after the water level of 1 meter per acre of water the whole pool evenly spilled, once again every 2 days. At the same time with the "fish recreation 2" better use. If the lesion is severely infected, use "Yukang Le No. 1" to add 1.5% to the feed and continue feeding for 3 to 5 days.