In recent years, with China's accession to the WTO, it has provided opportunities for China's international trade in aquatic products, but the problem of drug residues has become a major obstacle to the export of squid. In particular, Japan, the exporter of squid, has adopted a stricter drug residue testing system. The export of squid in China has been severely hampered, the price is low, and even only one-third of Japan’s domestic price, the loss of the peasant is serious, which restricts the healthy development of China’s oyster industry. Among the squid diseases in China, rotten tail disease, rotten rot disease, liver and kidney disease (ede's disease) are still the three major diseases that threaten the carp culture industry. In the past few years, chemical drugs and antibiotics have been used to prevent rickets. Good results, but not very suitable for the pollution-free farming situation currently advocated. According to the survey of some oyster farms in Chaozhou City, Guangdong Province in recent years, individual oyster farms have always adopted the traditional method of preventing rickets. Most of the drug residue inspections during the sale of cockroaches were unqualified. The most typical one was a nursery school in 2005. More than 100 tons of squid cultured have not been tested and exported in May 2006, and some nuisance-free oyster farms have gradually changed their concept of rickets prevention since 2000, and try not to use or use chemistry as much as possible. In recent years, in addition to some of the super-standards and domestic sales, all the drugs have been tested and exported to Japan by the roasting factory. Here is a little experience and experience in preventing and treating rickets:
1, squid rotten disease
The rotten tail disease of squid is mainly caused by infested seedlings of less than 100g, which can occur all year round, but it is mainly in spring and summer. It is caused by Aeromonas hydrophila and Rhizoctonia pyogenes infection. The main symptoms are the squid's tail, fins, mouth mucus shedding, whitening, gradually developing muscle redness, fins, skin rot, serious It reveals bones and even breaks.
In recent years, some markets have been preventing the use of antibacterial drugs to prevent and cure rotten tail disease in the prevention and treatment of squid rotten tail disease. The pre-export inspections of Chengyu have been qualified. The following measures have been taken: 1. Maintaining good cleanliness Water quality, thoroughly clean the sewage at the bottom of the pool or feed residue when changing water every day, and maintain the light green water quality, the water exchange capacity is controlled within 30%, so that the water quality remains relatively stable; 2. After the disc pool screening specifications are adopted 3 %~5% of salt water is dipped for more than 20 minutes. The new pool water culture zone has certain water quality of green algae; 3. When there are individual bad tailed squid, use 2% salt water for dip in time, which can prevent bad rotten The spread of the tail disease.
2, salmon liver and kidney disease
Cod liver and kidney disease is an infectious disease caused by delayed Edwardella, which is divided into renal liver and kidney disease and liver and kidney type liver and kidney disease. Kidney type liver and kidney disease mainly occurs in seedlings within 10g of white seedling stage. It is caused by the red-worm (silk) inducing stage of white seedlings, which has an acute onset and high mortality, which is characterized by obvious swelling of the kidney and even ulceration. Liver and kidney type liver and kidney disease mainly occurs in a serious disease of large-sized seedlings to adult mites. The early stage of the disease mainly manifests as hepatic and renal enlargement, pectoral fins, pelvic fins, and dorsal fins. The liver is ulcerated and the stomach is full of mucus. Simple liver and kidney disease does not show intestinal congestion, and intestinal congestion or bleeding can be seen when the red fin disease occurs. The disease can occur all year round, especially in spring and summer. (Editor's note: Practice has proved that regular oral administration of "Bao Ning Ning 3#" can effectively prevent liver and kidney type liver and kidney disease).
The prevention and treatment of kidney-type liver and kidney disease is mainly to disinfect silkworms and prevent silkworms from carrying bacteria. The traditional method is to rinse the silkworms with water, and then use antibacterial drugs for disinfection, which can prevent the occurrence of white seedlings and sputum liver and kidney diseases. In recent years, in order to avoid the residual contamination of antibacterial drugs, many nursery farms use 0.7%~0.8% saline when rinsing the silk mites, and rinse the silk mites in 1 day~2 days, which can effectively stimulate the silkworm to empty the intestines. The feces are reduced by the silkworm. In addition, pick up the silkworm before feeding, mix "three yellow powder" (Huanglian, Huangqi, Cork mixed in 1:3:2 ratio) or "Bao Ning 4#" for 10 minutes to 20 minutes, then proceed Feeding.
3, squid rotten disease
Carp rotten rot disease is divided into bacterial rotten cockroaches, parasitic rots and mold rot, but the most serious damage is mainly bacterial rotten cockroaches and mixed infections of bacteria and parasites. The most harmful specifications are medium Cheng Yu. The use of drugs in earthen ponds tends to damage water quality, leading to long course of disease and large losses.
In recent years, in order to avoid the use of chemical drugs, in the prevention and control of squid rotten sputum, the use of ecological control methods based on the control of water quality, while using some Chinese herbal medicines have achieved good results, the main practices: 1, with aerobic machine According to the amount of fish in the pond, one ton of fish is equipped with an aerator of 0.5KW~0.75KW. The number of aerators can be reduced before and after noon on a sunny day, but it should be opened within 3 hours after cloudy, turbid and 3 hours after eating. Aerators increase oxygen; 2. Appropriate replacement of water depends on weather, food intake and water quality changes. The daily change of water in the cement pool should be controlled within 30%. Avoid large-scale exchanges. The earthen pond should have a certain amount of new water into the pool every day. 3. Reasonably mix the squid, squid, herring and squid to control the water quality. 20 carp, 30 carp, 3 to 5 carp, 100 to 200 carp; 4 appropriate use of quicklime, low-toxic pesticides, control certain leeches, keep water alkaline, to facilitate Algae growth; 5 in the season of suitable temperature, large amount of food, regular use of "three yellow powder", every 20kg feed mix 100g orally. In the early stage of the disease or regular use of Chinese medicine gallnuts, 1.5ppm boiled water and splashed in the whole pool.