Cassidae is an economic fish that is mainly cultivated or mixed in freshwater aquaculture in the middle and lower reaches of the Yangtze River. It has been widely promoted for its long speed, high meat content, and strong disease resistance. With the increase of stocking density, the culture methods have changed, and some diseases of eutrophic silver crickets have become more and more serious. In particular, outbreaks of acne disease in aquaculture waters in recent years have resulted in viciousness, rapid spread, and high mortality rates, which have caused large economic losses to farmers.

Etiology

The pathogen is Aeromonas punctiformis, belonging to the family of Vibrio spp., belonging to the family of Vibriaceae. It exists in water all year round and is a conditional pathogen. The general water quality is polluted, the density is too large, the water quality is more fat, the transparency is low, and fish body injuries are prone to occur.

popular

Heterotrophic silver acne disease occurs throughout the year, especially in spring and autumn. The suitable water temperature for pathogenic bacteria is 20°C～25°C, which mainly endangers the spring release of fingerlings and adult fishes, while the aquaculture waters without diseased fish and the incidence history are less frequent. After diseased fish infection, it is easy to be complicated with vertical scale disease and water mold disease, and the mortality rate after infection is extremely high, reaching 60% to 80%.

symptom

Diseased carp and other parts of the back of the carp uplift, uplift at the scales is better, the skin congestion, redness and inflammation, touch with a soft edema feeling, cut the affected area with a knife, muscle fiber dissolution. The muscles are putrefy, and sometimes the scales are erected, the fin bases are congested, the tail is curved, the affected area is watery mold, the anatomy shows intestinal congestion, the inner muscles are red and swollen, and the microscopic examination lesions are free from pests such as Myxosporidium.

treatment

External medicine: Quanchiposa 0.3g/m3~0.5g/m3 chlorine dioxide or 0.3g/m3~0.5g/m3 dibromohydantoin, or 0.2g/m3 to 0.4g/m3 Chlorine (containing 40% to 50% of trichloroisocyanuric acid) for 3 days to 5 days; if the condition is serious, the dose on the first day is doubled. After a course of disinfection and antisepsis medicine, every 2 days, Quanchiposa 15g/mu ~ 20kg/mu quicklime or 2g/m3 bleach (filter residue). When the water quality is more fat, the mu should be splashed with 15 ml to 20 ml of concentrated glutaraldehyde and be used for 3 days to 5 days. Every other week, the chlorine should be sprayed with 0.3 g/m3 ~ 0.5 g/m3 of strong chlorine. Use 3 days to 5 days.

Internal medicine: Each 100 kg of fish with 1 to 2 grams of complex vitamins + Norfloxacin 2 grams to 5 grams, mixed mix 5 kg to 10 kg of feed, 2 times a day, once every 3 days to 5 days. For every 100 kilograms of fish, three yellow powders (5 grams to 10 grams) and sulfadiazine (10 grams to 15 grams) are mixed and 5 kg to 10 kilograms of feed is mixed and fed twice a day for 3 days to 5 days. For every 100 kg of fish, 20 to 30 grams of allicin + 5 to 10 grams of sulfamethoxazole is mixed, and 5 to 10 kilograms of feed is mixed and mixed for 2 times a day for 3 days to 5 days.

prevention

Clear pond disinfection: with water disinfection, mu water depth 20 cm ~ 50 cm, with 150 kg ~ 200 kg of lime with water clear pond, kill all kinds of wild fish; dry disinfection, mu 100 kg ~ 150 kg quick lime Dry pool spills, especially in the ponds where hemorrhoids have developed. In addition to being well-sterilized, they must be exposed to wind and freeze for 10 days to 15 days.

Fish stocking: The fish species or adult fish to be thrown in should reduce the intensification of transport time and mechanical damage as much as possible, and eliminate diseased, injured fish species or adult fish ponds. The fish to be placed or adult fish must be sterilized in the lower pool, generally 20 grams per cubic meter of potassium permanganate soak for 20 minutes, or 3% to 5% salt soak for 15 minutes to 20 minutes after the release, the test temperature may be. Acres of 1000 to 1500 tails of winter-feeding fish are raised or 1,000 kg to 1250 kg of adult fish are raised.

Regulation of water quality: Aquaculture water to ensure that the water is fresh, transparency in the 25 cm to 30 cm, and ensure that every 15 days to 20 days mu with 15 kg to 20 kg of lime splashed once, or put in other disinfectant drugs once.

Day-to-day management: When the diseased squid is found out in a timely manner and diagnosed and determined by aquaculture technical experts, timely measures are taken to treat the disease, and the dead fish are removed from the site or detoxified.

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