Prevention and treatment of hepatobiliary disease in first-year grass carp
During the cultivation of first-year grass fingerlings, it is easy to cause a nutritional disease, hepatobiliary disease, due to factors such as water quality and feed. In particular, high-density, feed-based breeding ponds are more prone to this disease. In recent years, there has been a heavy case of disease and a prolonged period of onset. The majority of farmers should pay sufficient attention.
Symptoms: Diseased grass carp species have no apparent symptoms on the body surface. A very small number of diseased fish shows reddish or dark red color under the cranium. The gill filaments are purplish red or patchy, and a few gill filaments are serrated or attached to sludge and algae. Dissection revealed that the external and internal fat deposits of the intestine were grayish white, yellowish, and patchy; the gallbladder was swollen (1 to 2 times normal fish), thinning, bile darkening, and severe bile external dipping.
First, the cause of the disease
1. Due to the artificial feeding of cakes, granules and other commercial feeds, grass carp passively changes its food habits, and the body's functions are unable to adapt to changes in food habits. Long-term feeding of feeds that exceed their nutritional needs, nutrition cannot be completely transformed, and body fat accumulated More often than not, the immune system declines.
2. During the feeding of the product feed, mildew occurs due to improper storage, the process does not meet the process requirements, so that some of the inherent harmful substances in the feed are not removed, and some manufacturers even add hormones artificially in order to pursue a one-sided feed coefficient. , resulting in excessive growth, liver fat accumulation, excessive burden on the gallbladder, and decreased function.
3. A variety of fish polyculture, improper proportion, excessive water quality is also one of the causes of the disease.
Second, prevention
Once the disease occurs, it is fierce. External use of drugs is not effective, mainly rely on internal treatment, and the effect is not obvious, so the main prevention of the disease.
1. The implementation of green and fine feeds to feed, to meet the food needs of grass carp, reduce the accumulation of fat in fish, prevent the occurrence of hepatobiliary disease.
2. Regularly adjust the water quality to keep the pool water live and cool.
3. After the summer flower is divided into ponds regularly (10 to 15 days), hepatic lipid-lowering drugs such as choline chloride are applied. If soaked with salt, the application of salt will reduce the accumulation of hepatic fat and increase hepatic detoxification and hematopoiesis.
4. Once the disease occurs, do not blindly use the drug, but do not rush too fast. The main herbal preparations for cooling, diarrhea, and lipid-lowering, such as Sophora flavescens, Poria, Sanhuang, etc., should be used, with little or no chemical agents to prevent fish from becoming second-degree. Phytotoxicity. During the treatment period, it should be mainly fed with green feed to improve the treatment effect.
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