1. Selection of farm sites General requirements: adequate water supply, convenient drainage and irrigation, no water pollution requirements, and meet the standards of fishery water quality; cool in winter and cool in summer, far from noisy; convenient transportation and adequate power supply to facilitate aquaculture production. Which water source conditions are good or bad is the key to success or failure of frog breeding. 2. Construct a large pool for every 100m2 of the frog pool, and divide each large pool into four small pools on average. The pool side is surrounded with a 40-mesh screen. The sieve bowl is 1m above the bottom of the pool. The bottom of the sieve bowl should be 20-30cm buried in the soil; the pool bowl is 40cm high, the slope is 1:3, and the water level is maintained at 30-40cm. Water layer depth can not be less than 20cm, otherwise the water storage capacity is too small, water is turbid, and bullfrogs are easy to get sick; rectangular pools are preferred for easy operation; plastic pipes with a diameter of 10-12 cm are used as the water supply and drainage pipes, and the overflow and overflow holes are set. The location should be in the opposite corner of each large pool; in each small pool, four 8040cm buoyant white foam plastic panels are placed as rest platforms for bullfrogs; shaded by a black sun screen above the pool to prevent sun exposure in the summer. 3, before the release of stocking, dry ponds with 50-75kg of lime or bleach bleach 10-15kg (effective chlorine content of 30% or so) for disinfection. General Qingchi disinfection can be put on seedlings for 10 days. The stocking frogs can be washed with 20 ppm potassium permanganate solution for 10-20 minutes. When people are dipping, they must be observed on the site and find that the abnormal situation immediately remove the frogs. The stocking densities of young frogs were 60-80 birds per m2. With the individual differences, they were stocked in graded ponds. The stocking density of adult frogs was 30-40 eggs/m2. 4. Feeding Management (1) Patrol Pool Check each morning, evening and mid-night bathing pool once to check whether there is any hole in the screen mesh. If it is damaged, it must be repaired immediately to prevent the bullfrog from fleeing and guarantee continuous water flow for 24 hours at least daily. Achieve 300% water exchange rate; plastic cannula can be used to control the level of water level at the overflow mouth, generally the water depth is kept at 30-40cm, and the water quality is kept fresh. It should also be observed that if there are abnormalities in the feeding and activity of bullfrogs, appropriate treatment measures should be taken in time. (2) Feed feed is mainly based on floating water-based compound feed. Before the first half hour of feeding, the compound feed is first wetted with clean blisters so that the feed is slightly swollen. This can prevent the sewage in the bait absorption tank and eliminate the food after the bullfrog. Gastrointestinal diseases can also promote the absorption of nutrients by bullfrogs. The daily feeding amount is kept at 7-15% of the frog's body weight. The feeding amount is calculated according to the climate, water quality and residual bait, in addition to the frog weight calculation. It is advisable to eat within half an hour after feeding. (3) Feeding by grading During the breeding of bullfrogs, to prevent the phenomenon of mutual-residual eating, individuals with large differences in size are screened and graded at regular intervals, and bullfrogs with the same specifications are adjusted to the same pond. Feeding, to prevent the big frog to eat small frogs, at the same time pay attention to control the breeding density. (4) Prevention and control of disease During the breeding process of bullfrogs, it is really necessary to “maintain prevention and control.†Disinfect the clear pond before stocking, use quicklime or bleaching powder to disinfect, kill the enemy's harmful organisms and pathogens, and regularly disinfect the whole pond with bleaching powder or strong chlorine; sprinkle with 20ppm potassium permanganate in time after splitting the pond. Disinfection is carried out to prevent mechanical damage from spreading pathogens; diseased frogs and dead frogs are found to isolate them in a timely manner. In addition, the tools must be disinfected with a high concentration of bleach or potassium permanganate solution. Control reasonable breeding density. The feeding of the bait is done “four settingsâ€, ie fixed-point, regular, quantitative, and qualitative. When raising to a frog, individual taro and red-legged phenomena occur. The taro bullfrog is singled out in a timely manner, and 15 ppm of strong chlorine is used for continuous disinfection for 5 days while increasing the amount of water exchange.
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