1, the choice of species of frogs as the production of the species of frogs is best to choose 3 to 4 years of age into a frog, 3 to 4 years old frog individuals large, strong physique, large amounts of eggs, the general amount of ovulation in 1500 ~ About 2000 grains. The 2nd-instar Rana sylvatica is small and has a small amount of eggs. The frogs above the 5th instar are weak, so the 2 frogs and over 5 larvae do not normally need to make frogs. In addition, the shape and body color of the species of frogs should also be selected. The main choices are individual frogs that are large in size, have good plumpness, have smooth skin, have dark brown body color, and have a pronounced "human" spot on the back of the body.
2, Spawning spawning pool area of ​​20 ~ 30m2 to the rectangle is appropriate, spawning pool should be narrow, easy to retrieve eggs, water depth of 20 ~ 30cm can be. Rana species prefer to spawn in shallow water, so pool water cannot exceed 30cm. In order to prevent the frogs from escaping, the spawning pool can be surrounded by plastic sheets to form a 1m-high escape prevention wall. When the water temperature reaches above 6°C, the selected species of frogs can be placed in the spawning pool. Before the frogs are placed, they are sterilized with 3% saline for 10 minutes. The ratio of male to female is 1:1. 15 to 18 pairs of frogs can be placed per square meter. The suitable temperature for spawning of Rana sylvatica is 10-11°C, and most of them spawn in the morning. The eggs produced should be removed and moved to the hatchery in a timely manner. The same batch of eggs should be placed in the same hatchery. The frogs that produce the eggs should be promptly moved to a place conducive to breeding frogs for genital sleep.
3, hatching hatching pond is rectangular, an area of ​​about 10m2, should not be too large, generally 5m long, 2m wide, water depth 30cm, injection and drainage ports located in the same side of the pool, and set gauze to prevent flooding outflow. Incubator pools can put 2 to 3 groups of eggs per square meter. To prevent the eggs from being blown to the pool or piles by the wind, the hatching pool can be divided into several plots in the pool. The key technique in the incubation period of frog eggs is to adjust the water temperature. The optimum incubation temperature for frog eggs is 15-18°C. When the water temperature is lower than 8°C, the mortality rate of eggs is high, and the mortality rate above 35°C is also extremely high. Therefore, it is very important to manually control the water temperature. Artificially hatched Rana sylvatica is generally covered by a plastic film covering a plastic shed on the hatchery. When the temperature is high during the day, open the plastic film to ventilate and cool. When the temperature is low in the evening, cover the plastic film for insulation. It must be noted that the temperature difference between day and night cannot exceed 5°C. This method can improve the water temperature by more than 5~8°C than the open hatch pond. Such an artificial temperature control method can incubate the earthworm in 5 to 7 days, shortening the incubation time and increasing the hatching rate.
4. Feeding and management during the flood season The hatchlings should not be separated immediately. They should be fed to the rearing pond after the meal is finished.
4.1 Dianchi Lake Dianchi area 30 ~ 40m2 is appropriate, the depth of the pool is 30cm, the injection and drainage ports are on the same side, and the escape-proof net is installed.
4.2 Disinfection and disinfection tanks Each square meter of water in the rearing pond can be treated with quicklime 250-300g or bleached powder 30g. The whole pool should be disinfected and disinfected. After 7 days of disinfection, the medicine can disappear before it can disappear.
4.3 Stocking Density 2500 to 3000 tails per square meter of water can be stocked.
4.4 Storks Rearing The hatchlings began feeding on the fifth day. The opening material is best to use egg yolk water. Each 10,000 oysters are fed with 1 egg yolk water, 2 times a day, Quanchiposa. After 5 days, cooked vegetables, cornmeal, bean cake flour, etc. can be fed. When baiting, the bait should be put in the dish and put into the shallow water in the pool. The amount of bait should be controlled flexibly, and the principle of feeding and not leaving the residual bait is sufficient. After about 40 to 50 days of growth, the earthworms enter the metamorphosis stage. The earthworms stop feeding during the metamorphosis. At this time, feeding can be stopped. If the earthworms do not grow together, they can be fed in small amounts.
4.5 The patrol pond should carefully observe the eating and feeding conditions, activities, water quality, and pests and diseases of crickets every day, and take timely measures to identify problems.
5, metamorphosis period management After 40 to 50 days of growth, enter the metamorphosis period, the limbs grow, the tail shortens, from the baboon breathing to lung breathing, if you do not turn to land life in time, long time living in the water will drown death At this time, the bridge should be approached in the pool by placing more branches in the pool. The branches should be put into the water and placed on the shore of the pool so that the perverted frog can climb to the land through the guide bridge. The management staff can then The small frogs are collected, brought together, sold to frog farmers or shipped to frogs for frog feeding.
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