Loach Breeding Rapid Breeding Techniques - Loach Breeding
Site selection The breeding site should meet the following conditions: adequate water supply, convenient drainage, self-irrigation, fresh water, no pollution, neutral or slightly acidic clay soil, sufficient sunshine, quiet environment, convenient transportation and normal power supply.
Pond construction
1. The same specifications are adopted for the loach seedling pool and the commodity loach culture pond. An area of ​​50 to 100 square meters, the pond around the surface 40 cm above the lake, pool slope 60 to 70. The depth of the pool is 80 to 100 cm. After the pond is dug, the pool wall should be tamped. Use a 50 cm 50 cm cement board to protect the slope. The bottom of the pond should be laid with about 20 cm of humus and the depth of water should be kept between 30 and 50 cm.
2. Anti-escape facilities. Surrounding aquaculture ponds use mesh sheets, calcium plastic plates or porcelain plates as enclosures to prevent snakes, rats and other predators from entering the culture area; 120 mesh mesh nets are placed at the inlet and outlet ports to prevent muddy escaping and predators. Wild fish eggs and seeds enter the pond.
3, water facilities. The inlet and outlet are diagonally arranged. The inlet is 20 cm above the water surface. The outlet is located at the bottom of the fish slip. It is connected with a PVC pipe to 30 cm above the water surface. The height of the PVC pipe can be adjusted to adjust the water level when draining.
4, fish slip (set mud pit). In order to facilitate fishing, the pool is provided with fish slips connected to the drain bottom, which is about 5% of the area of ​​the pool bottom, 30 to 35 centimeters deeper than the bottom of the pool, and the fish slips are surrounded by planks or cement masonry. .
Prepare for stocking
1, pond clearing. 10 days before the loach stocking, clear the pond, check the plugging of the hole, dredge into the drainage pipe, and dig the bottom sludge. After releasing the water to a depth of 10 cm, 1 kg of calcined pulp is used for sterilizing every 10 square meters.
2, storage and fertilization. After 3 days in the clear pond, add water to a depth of 30 cm and apply basal fertilizer. Apply 3 kg of chicken manure or 5 kg of pigs, cattle, and manure per 10 m3 of water. Apply 7 g of nitrogen fertilizer and 1 g of phosphate fertilizer per cubic meter of water. .
The seedlings are put into the muddy seedlings and the time of the pond is 5 months per year. The seedling density is 1500 to 2000 tails per square meter. When the loach grows to a body length of 3 cm, a pond should be screened and the density of the loach seedlings should be 60 to 80 tails per square meter. In the process of seed feeding, care should be taken to test the water before stocking to check whether the toxicity of the water is eliminated. The gap between the water temperature in the seedling container and the water temperature of the pool water should not exceed 2°C. For example, the muddy seedlings are filled with oxygen in a nylon bag. Transportation should be done before the seedlings in the pond before the "warm seedlings" treatment, the oxygenated nylon bag placed in the pool for 20 minutes, so that oxygen inside and outside the oxygen bag water temperature consistent, and then slowly release the seed.
Feeding management
1, the pre-cultivation stage (mud seedlings less than 2 cm in length). According to the situation of water color, top dressing is appropriate. Fertilizers can be used to fertilize farmyard manures such as pigs, cattle, chickens, and human feces. Superphosphate, urea, and ammonium bicarbonate fertilizers can also be used. Small amounts of water can be used. The water color is yellow-green, and the water depth is controlled within 30 cm. The transparency is controlled at about 20 cm. At the same time, every 200,000 rearing muddy seedlings are ground into 15 kilograms of soybean milk with 1 kilogram of soybeans.
2, post-cultivation stage. After the muddy seed size reaches 2 cm, gradually deepen the water level to 50 cm. In addition to continuing to fertilize the water quality, it should also be fed with compound feed. It should be fed once a day in the afternoon and afternoon, and the daily feeding amount should be 4% to 10% of the loach body weight. Feeding amount should be considered as water quality, weather, and feeding conditions. When the water temperature is above 15°C, the loach's appetite increases with increasing water temperature; at 25°C～27°C, appetite is particularly strong; at 28°C, appetite gradually decreases. If the temperature exceeds 30°C or less than 12°C, feed or feed should be stopped.
Daily management
1, adjust the water quality. Add new water, change the water 1 or 2 times a week; diligently apply fertilizer to keep the pond water “fertile, live, tender, and coolâ€, preferably yellow-green.
2, patrol pond. Inspecting the loach activity and the change of water color once in the early, middle and late afternoons, and finding problems in time.
3. Regularly prevent diseases. Clean the feeds, clean the feeds, do a good job of disinfecting feedstuffs, tools, etc., and regularly feed drugs that prevent fish diseases.
4, prevent and prevent escape. Pay attention to preventing enemy invasion and mud escaping, and always check the inlet and outlet.
Disease prevention and control adhere to prevention, focusing on governance, the principle of combining internal and external medication.
The common diseases in the muddy seedling stage are:
1, bubble disease. Due to the lack of dissolved oxygen in water, dissolved oxygen, or other gas content caused by more. Symptoms: Loach floats on the water and belly bulges like bubbles. Control methods: strengthen daily management to prevent water quality deterioration. At the time of onset, fresh water was added immediately and the whole pool was splashed with 4 to 6 kg of salt per acre.
2, trichodiasis. Symptoms of the disease are slimy body, often floating on the surface of the water, swift and uneasy, or spinning on the surface of the water. There are many mucus on the body surface. Control method: Use 0.7ml/kg copper sulfate and ferrous sulfate (5:2) mixture Quanchiposa.
3, red fin disease. Caused by Brevibacterium infection. Diseased, muddy fins, abdomen, skin, and anus around congestion, ulceration, caudal fins, pectoral fins red, rot. Control methods: Sprinkle with 1 mg/kg bleach in the whole pool.
When the loach grows to a body length of 5 cm, the breeding stage for the loach seedlings is completed and the breeding team is established.
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