Common Fish Drugs 3
II. Furans
Furans are synthetic broad-spectrum antibiotics, but only 3~4 kinds are used to control aquatic diseases. The basic structure of furans is a furan ring with a nitro group attached to the fifth carbon atom. It has strong antibacterial effect. At low concentration, it can inhibit the biological reproduction of various Gram-positive bacteria and negative bacteria; at high concentration, it has bactericidal effect. General bacteria are not easy to produce resistance to furan drugs, even to sulfa and antibiotics with resistance to bacteria, furan drugs are still relatively sensitive, but furan drugs are poorly absorbed in the body, absorbed in the body and easy to quickly destroy, blood often can not reach effective blood antibacterial concentration, only in the intestinal tract can maintain effective effect, so in the prevention and treatment of fish intestinal bacterial infection has a good role. In addition, it has recently been reported that furan drugs have carcinogenic effects, so their use has been restricted, and long-term use of such drugs will cause liver and kidney damage in fish.
1. Furazolidone (furazolidone)
[Properties] Furazolidone, also known as furazolidone, is yellow powder or crystalline powder; odorless, bitter taste; almost insoluble in water and ethanol, and slightly soluble in chloroform; decomposed in alkali, dark color under strong light, suitable for sealed storage in the dark.
[Action] This product has low toxicity. Antibacterial spectrum is wide, effective to a variety of Gram-positive and negative bacteria, 5~10 μ g/ml has bacteriostatic effect, 20~50 μ g/ml has bactericidal effect. The drug also has anti-protozoan effect, bacteria are not easy to produce drug resistance to this product, and there is no cross-resistance between sulfonamides and antibiotics. Oral absorption from gastrointestinal tract is small, blood concentration is low, and intestinal concentration is high.
[Usage] This product is mostly used to prevent and treat bacterial enteritis. It is also effective on gill rot, red skin, furuncle, white-headed white mouth, vertical scale, rotten tail, ulcer, vibrio, eel columnar disease and Edwards disease.
[Usage and Dosage] When the feed rate is 4%, the usual dosage is 2.5 g per kg of feed, and the maximum is not more than 5 g. according to a report by japan's tanaka eryo. Control gill rot, red skin, furuncle, white head, vertical scale, ulcer, vibrio disease and so on can be mixed into feed according to the proportion of 0.1~0.2%, made into bait to feed once a day, continuous feeding 3~5 days. Sprinkle 0.3~0.5ppm in the whole pool. Sprinkle should be carried out when the sunlight is weak.
2. Furantoin (furan)
- Prev
Key points of mixed culture of fish, shrimp, eel, dolphin and crab
First, the selection pond is nearly square, with a width of 8 meters and a depth of 0.6 meters to 0.8 meters. The beach surface can lift water to 1.2 meters, the bottom of the pond is sandy soil, the water quality of the source is good, and the injection and drainage facilities are complete. The inside of the pond is buried in the soil with close-eye polyethylene mesh to prevent eel, Loach, crayfish and crabs from drilling holes. Use asbestos tiles as anti-escape walls. The pond should be strictly disinfected with drugs such as quicklime, apply sufficient basic fertilizer, cultivate natural bait, plant Artemisia grass, bitter grass and other aquatic plants, and put a large amount of live snails before and after the Qingming Festival.
- Next
Construction of turtle pond
1. Juvenile turtle pond is called juvenile turtle when it is just born to less than 10 grams. The area of the pool is 2 square meters ~ 8 square meters, rectangular, and the depth is 0.3 ~ 0.4 meters. The water depth is kept at 0.1 m ~ 0.15 m, the bottom of the pool is covered with fine sand, and the pool is covered with a shade canopy 1-1.5 m higher than the top of the pool. A rest table with a width of about 20 cm should be built at both ends. Build a 30 °slope at the intersection of the rest table and the water surface to facilitate its up and down. two。 The young soft-shelled turtle is called young turtle whose weight in the pond is about 10 ~ 100 grams. The area of the pool is 20 square meters.
Related
- On the eggshell is a badge full of pride. British Poultry Egg Market and Consumer observation
- British study: 72% of Britons are willing to buy native eggs raised by insects
- Guidelines for friendly egg production revised the increase of space in chicken sheds can not be forced to change feathers and lay eggs.
- Risk of delay in customs clearance Australia suspends lobster exports to China
- Pig semen-the Vector of virus Transmission (4)
- Pig semen-the Vector of virus Transmission (3)
- Five common causes of difficult control of classical swine fever in clinic and their countermeasures
- Foot-and-mouth disease is the most effective way to prevent it!
- PED is the number one killer of piglets and has to be guarded against in autumn and winter.
- What is "yellow fat pig"? Have you ever heard the pig collector talk about "yellow fat pig"?