Small-sized net cage breeding commodity mud technology in pond

In recent years, the muddy aquaculture industry has developed rapidly, and a variety of farming methods have emerged. The author has set up a small-sized cage for the cultivation of commercial mud aquiculture in the pond because of the characteristics of muddy mud, easy drilling mud, and difficulty in fishing.
First, the pond selection Set the cage area of ​​the pond to more than 5 acres, requiring fresh water, adequate water, good water quality and pollution-free, water-rich dissolved oxygen content; pool depth of 1.5m ~ 2.0m, aquaculture water level stability; flat bottom And no debris, sludge thickness of about 15cm; pond into the drainage and convenient.
Second, cage design
1. The structure of the cage is made of polyethylene knotless mesh with good mesh and tight mesh. The net size is based on the principle that the species does not escape and is conducive to the exchange of water inside and outside the cage. It is generally 0.5cm to 1.0cm. A 0.5 cm diameter cord was inserted around the body, and the mesh pieces were spliced ​​into a rectangular box with a size of 3m2m1.5m, and the upper port was capped.
2. The cage is set around the cage fixed with bamboo sticks, fixed in the pond, and the upper part of the cage is 50cm above the water surface. The cages are arranged in a "1" shape in the pool water, with a distance of more than 3m to facilitate the exchange of water bodies inside and outside the cage. The new cages are placed in the pond 15 days before the pods are introduced into the tank, allowing the mesh to fully adhere to the algae. The bottom of the cage is muddy and the cage must be covered with 15cm to 20cm of soft mud, so as to avoid the muddy being scratched by the bottom wall of the cage and causing skin infection and infection.
Third, the kind of stocking
1. Seed-selected alfalfa sources include artificial propagation seed and wild seed. Artificial breeding breeds have high survival rate and rapid weight gain, but the cost of seed is higher. The cost of wild seed is low, but the survival rate of culture is relatively low and the weight gain is slow. Farming quail species should be selected with uniform specifications, robust physique, disease-free and non-injurious fleas, and the removal of injured and frail diseases.
2. Before disinfecting and digging into the box, soak the seeds with 10ppm concentration of potassium permanganate solution for 10 seconds to 30 seconds, or bathe with 3%~5% concentration of salt water for 10 seconds to 20 seconds. Seconds to kill pathogenic bacteria and parasites on the body surface.
3. The stocking size and stocking size are 5 to 7 cm in length, and the stocking density is 1500/m2 to 2500/sqm. However, the specific stocking rate should also be based on whether the water body is thin, whether there is running water, or The size and size of the species, the physical condition of the species, and the feeding conditions were adjusted.
Fourth, feeding and management
1. The feed is rich in feeding mud, and can feed animal feed, such as fish meal, animal viscera, earthworms, small trash fish, blood meal, etc., and can also be fed to soybean meal, vegetable meal, sub-powder, wheat bran, cereals, etc. Feed and artificial feeds, of which the ratio of animal feed and vegetable feed is 6:4, the proportion of animal feed in formulated feeds should be increased to 80% when the water temperature rises above 25°C. Feeding should be done in "four settings": First, timing, that is, feeding 2 times a day, according to the characteristics of loach feeding at night (during vigorous growth during the day and also feeding) characteristics, feeding should be mainly evening; Second, Fixed-point, that is, one feed station with an area of ​​1 square meter is set in each cage, and the feed is manually distributed on the feed table, and the speed of the spread is determined by the speed of feeding of the loach. "More, less," the principle of casting, at the same time, set the feed table for feeding, can make the loach form a habit of concentrated feeding, easy to observe the loach's food intake and growth, timely adjustment of the amount of feed; third is the quality, ie It is required to not feed the rotten and degenerate feed, keep the feed fresh and its composition is relatively stable and balanced; the fourth is quantitative, ie, the daily feed amount of the feed is 4% to 10% of the total weight of the loach, and the specific daily investment The feeding amount depends on the water temperature, weather, and muddy feeding conditions. Loach food intake is greatly influenced by the water temperature. When the water temperature is above 15°C, the loach appetite gradually increases. The water temperature is particularly prosperous between 25°C and 27°C. When the water temperature is higher than 30°C or lower than 12°C, the loach appetite decreases ( At this time should be less or not fed). Due to the gluttonous characteristics of the loach, excessive feeding should be avoided during the breeding process, and it is generally advisable to eat the feed within one hour.
2. Set the shelter muddy not like the strong light, set up the shade net above the cage, or place the shelter (such as water peanuts) in the cage, cover the water no more than 1/2 to 1/3 of the cage area, Prevents strong light. Usually pay attention to remove excess water inside the cage peanuts.
3. Scrubbing the cage Scrub the mesh once a week to keep the water inside and outside of the cage circulated, so that the plankton in the pool water can enter the cage, which can provide rich basic food organisms for the loach.
4. The patrol inspection box insists on checking the boxes in the morning and evening patrol ponds to check whether the cages are damaged or leaky and repair them in time to prevent muddy escaping. Pay attention to the harmful organisms coming into the boxes to cause damage to the mud lice, such as carnivorous fish and water snakes. , water mice, etc., caught immediately after discovery. In order to prevent the water rat from invading, it can be fixed on the cage with a bamboo cross bar at the junction between the fixed cage and the water surface, and expose the water surface more than 10cm to prevent the water rat from catching the cage. Pay attention to changes in the water level of the pond and timely adjust the depth of the cage into the water.
5. Remove the residual baits and remove the residual bait in the feed table in time to remove the dirt from the bottom of the cage regularly to keep the water in the cage clean.
6. Wind protection Pay attention to the local weather forecast and strong wind warning. Before the strong winds come, you must do a good job of windproof reinforcement of cages to prevent the winds from sweeping the cages and causing the dumping of the tanks.
V. Disease prevention and control The disease prevention work includes: dipping with a dilute saline or potassium permanganate solution before entering the box; and using a bleaching powder bagging method to prevent fish disease by placing the bleaching powder in a gauze bag and hanging it in a cage. Inside, let the bleaching powder slowly dissolve and spread, and pay attention to the principle of “multiple points, small amounts”. Disinfect the bags in bleaching bags every 10 days to 15 days. Each bag is filled with bleaching powder 150g. The feed table is removed on a daily basis. The bait, and often remove the feed table for cleaning, exposure and replacement; cage lid to prevent birds from infringement. Diseases found in the breeding process should be promptly diagnosed and treated:
1. Symptoms of saprophytic disease are the attachment of white hairy hydromycosis to the body surface of the disease. This disease occurs in the lower water temperature period. When the fish is injured, it is highly susceptible to infection. Therefore, mechanical damage should be avoided when trapping and transporting the loach. The diseased fish can be soaked in 4% saline for 3 seconds to 5 seconds.
2. Red fin disease caused by Brevibacterium infection, scrofula fin, abdomen, skin and anus around congestion, ulceration, caudal fins, pectoral fins white, decay, treatment with 1ppm bleach Quanchiposa, or with 0.5 The ppm concentration of dibromohydantoin was spilled in the full container.
3. Print Disease The disease is caused by pathogenic bacteria. The diseased lesions are edema and red. They are oval and round and resemble the seals. The affected area is mainly located on both sides of the caudal peduncle. The 0.5ppm concentration of dibromohydantoin can be used for full-case sprinkling during treatment.
4. Parasitic diseases are mainly caused by parasitic diseases such as trichomonads, tongue beetles, and third-generation worms. The diseased larvae are thin, often floating on the surface of the water, disturbed, or turning on the surface of the water. Mucus is increased on the surface and microscopic examination can reveal worms. Treatment can be used 0.5g / cubic meter crystal trichlorfon Quanchiposa.

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