Culture technique of soilless Loach

The advantage of Loach soilless culture is that Loach rests in fine sand, has high fishing efficiency when sold, tastes better than Loach raised in mud, and its culture density is four times higher than that of Loach cultivated in mud. the Loach hatched in spring in a pool made of concrete can grow to 15cm and 16cm at the end of the year. Let's take a look at the culture technology of Loach.

Culture conditions of Loach

Misgurnus anguillicaudatus pond culture requires adequate water source, fresh water quality without pollution, convenient injection and drainage, neutral or slightly alkaline loam soil, convenient transportation to ensure electricity consumption. The pond is rectangular in east-west direction, with a ratio of length to width of 2:1 and an area of 5 mu. The depth of the pool is 0.8-0.6 meters and the water depth is 0.4-0.6 meters. The soil of the pond wall should be compacted and surrounded by a net around the pond. The lower end is buried in the soil 10 cm and the upper end is 20 cm above the water surface to prevent the Loach from escaping and enemy creatures from entering.

Stocking model of Loach

1. Stocking preparation: clean up, transform and disinfect the pond 20 days before stocking Loach seedlings. Use barbed wire at inlets and drains to prevent escape. Dig a fish sliver with a depth of 30 centimeters and 50 centimeters and cover the bottom of the pond with a layer of decaying clay. The pond was cleared with quicklime 7 days before stocking, and the pond was sprinkled with 75 kg quicklime pulp at a depth of 10 cm per mu. Five days after clearing the pond, 25 cm of water was injected and 150-250 kg of organic fertilizer per mu was applied to improve the water quality.

2. Seedling stocking: artificial cultivation or wild seedlings are selected for Loach seedlings, but they should be neat, disease-free, injury-free, agile and fully released at one time. The seedling release time is generally in April every year, the average water temperature is more than 15 ℃, and the stocking specification is 80 seedlings / kg per mu. 1100 kg, it is best to choose the sunny afternoon. The seedlings were washed and disinfected with 8: 10 mg / L bleach solution before stocking, and the washing and disinfection time was 20: 30 minutes.

Feeding and management of Loach

1. Bait selection: Misgurnus anguillicaudatus is omnivorous fish. Small animals and plants, microorganisms and organic detritus in the water are its favorite food. Artificial breeding can directly feed aquatic insects, yellow powder insects, earthworms, maggots, clams, snails, fish meal, wild miscellaneous fish meat and livestock and poultry scraps, etc., can also be fed with artificial formula feed. Loach likes to look for food at night, so it should be fed once in the morning and evening. It is usually fed according to 3-4% of the body weight of fish in the early stage of culture and 4-6% of the body weight of fish in the middle stage, and the amount of compound feed can be reduced appropriately in the later stage.

2. Bait feeding: Loach bait should adhere to the four principles, properly reduce the amount of bait in rainy and muggy weather, patrol the fields for a week every day, and deal with problems in time, such as loopholes in the ridges, leaks and dead fish should be dealt with quickly, and keep the pool water tender green. Disinfect it with a disinfectant such as quicklime or bleach every 15 days. The fertilization of lotus root field should be based on multi-base fertilizer and less chemical fertilizer. Pesticides should choose products with high efficiency and low toxicity, and they are harmless to Loach. Change the water regularly, 20% to 30% each time.

3. Water quality control: the water quality should be "fat, lively, tender and cool". The water color should be yellowish green and the transparency should be 20cm to 30cm. When the transparency is more than 30 cm, 20 kg of organic fertilizer is applied per mu to increase the natural bait organisms of Loach such as radial rent and cladocera in the pond. If the transparency is less than 20 cm, topdressing should be stopped or reduced. In the hot season, new water is often injected, part of the old water is replaced, and the aerator is turned on regularly.

4. Daily management: patrol the pond in the morning, middle and evening every day, keep abreast of water level, water quality and feeding of Loach at any time, and deal with problems in time. Usually weed the pond side frequently, use chlorine dioxide every 15 days in high temperature season, sprinkle quicklime in the whole pool every 7 days, and apply microbial preparation once a month in the middle and later stages of culture. Often check anti-escape facilities, timely repair of loopholes, timely treatment of fish diseases, and make a good breeding diary.

Prevention and control of diseases and insect pests of Loach

1. Parasitic diseases: Misgurnus anguillicaudatus, which is attacked by rotifers, cups and third-generation worms, often floats on the surface and becomes restless. The control method is that the mixture of copper sulfate and ferrous sulfate (5:2) dissolves water and sprinkles evenly in the whole field, or Yuchongjing (deltamethrin solution) 0.15mg / kg 0.22mg / kg.

2. Printing disease: Misgurnus anguillicaudatus printing disease is caused by Aeromonas aerogenes infection, the focus is generally oval, round edema, and erythema, the affected area is mainly on both sides of the tail stalk, like a seal. The method of prevention and treatment is the same as red fin disease.

3. Red fin disease: Misgurnus anguillicaudatus red fin disease is caused by Brevibacterium infection. Part of the epidermis near the dorsal fin falls off and is grayish white. In severe cases, the fin is exposed and does not feed until death. Can be sprinkled with 1 mg / kg of bleach or 0.3 mg / kg of strong chlorine in the whole field, repeated once in 24 hours, and then sprinkled every half a month for prevention.

4. Bubble disease: due to insufficient dissolved oxygen, excessive dissolved oxygen or excessive content of other gases in water, Loach floats on the surface and belly bulges like bubbles. Strengthen daily management to prevent the deterioration of water quality, immediately add new water when the disease occurs, and sprinkle it in the whole pool with 4kg of salt per mu.

5. Water mildew: water mildew is not easy to be detected in the early stage. When it can be detected by the naked eye, the mycelium has invaded the wound of Loach and sent out the hyphae to form a cotton floc. Mold can secrete a large number of proteolytic enzymes, which can degrade the body tissue of Misgurnus anguillicaudatus and secrete a large amount of mucus, aggravate the disease, greatly reduce its appetite, weaken and die, often reproduce in spring, autumn or winter, and can be infected as long as there is skin trauma in fish.