The field semi-artificial (distribution) cultured Rana sylvatica is a rapidly developing industry in the northeast region. Many farmers have mastered the unique breeding methods and experience through the exploration in the production practice, and have improved the production efficiency and economic efficiency.
1 Simultaneous hatching Due to the inconsistent production time of frog eggs, during the hatching process of egg frogs, the larvae in the same pool are often of different sizes, and it is easy to experience the phenomenon of large larvae, small quail eggs, and eggs that are not hatched. . In order to avoid this situation, the farm uses the method of concentrating the eggs produced in the same period in the same pool, but the spawning period of the forest frog is as long as 15 days, and the daily output varies, sometimes the egg masses produced in 1 to 2 days. In order to fill a hatchery, it is sometimes not enough, so the number of hatch pools required will be more, and it takes a lot of manpower to divide the pool. In the process of feeding quail, it is also necessary to separate the ponds into baits suitable for different stages of pupa. Wang Qing Forestry Bureau farmers in the actual production, the use of centralized management, simultaneous hatching method, the effect is ideal, it is worth a try. The practice is as follows: In the warehouse (Northeast called warehouse), dig a deep pit (long, wide, and flexible in depth), tile it with air-tight plastic film, collect the eggs collected every day, and fill it with water. The depth of the water is better for immersing eggs, and the pits are covered with opaque items such as sacks. The reason why it was selected in the warehouse was because the warehouse was not light and the temperature was suitable. As long as the sun is not seen, these eggs can be stored for up to 10 days. When the quantity is enough, they can be transferred to the hatchery for simultaneous incubation.
2 CD-launched ducks Currently, one of the problems plaguing forest frog farmers is natural enemies. Wild ducks are the main natural enemies of the forest frogs during the flood season. The group of wild ducks fly into the hatchery ponds and swallow them unbridledly. Sometimes a few wild ducks can eat up all the quails in the pool for half a day, causing serious damage. The wild duck is also a national protected wild animal and is explicitly prohibited from catching. Some farmers use scarecrows, pickaxes, and sticky nets. Firecrackers are more effective, but the flood season is also a period of forest fire protection. It is forbidden to use fire. There is a way to try: In the hatching pool around the string, more than 1m in height, the disc will be discarded with a thin wire hanging on the rope, ranging from a distance of about 10m hung a smooth surface facing the pool. When the wind blows, the pool water and the optical disk map each other, and the light ducks will not dare to approach the wild duck.
3 Do not turn egg groups Many farmers mistakenly believe that the egg mass requires sunlight, and frequently flip the egg masses in the hatching pool so that all the egg masses can absorb sunlight. This is a wrong practice. When the eggs are laid down, it is already clear which side is facing downwards, which side is facing upwards, the upward side is called the anode, and the downward side is called the cathode. Eggs should be placed in hatchery ponds according to natural laws. Do not change them artificially. Otherwise, the hatching rate will be reduced. Only by sticking to the muddy bottom of the egg can it be turned to conform to the correct orientation.
4 Drought frogs In late autumn, a large number of forest frogs come down from the mountains and go directly to the nearby wintering ponds. Some wintering ponds are deep, and it is not easy to drain the water all the time, and fishing is difficult. At this time, the use of dry nets should be considered. The so-called dry nets are the nets that have been brought down to the water and landed on land. Specific approach: In the place about 1m away from the wintering pond, the overwintering pond is surrounded by a mulch, and the method of erecting the membrane is the same as the method of retaining the frog in the raft, and supporting the wooden stick in the circle. And leave a few mouths on the mulch, leaving the mouth and near the place to be flat, large moisture, complete vegetation, which is usually referred to as "forest frog Road." The number of mouths depends on the number of "forest frogs" around the wintering pool, and generally there are six thousand square meters of wintering ponds. About 50cm wide mouth, put on a diameter of 60cm, about 3cm mesh, length 3 ~ 4m of the net, (a farmer usually captures the nylon frog of the forest frog in the stream), both sides of the mouth of the net should be tightly connected with the mulch, and use wood sticks Stayed, the bottom should be flat and buried under the soil. The nets should be kept on the land for 1m, and the rest should be kept in the winter pool. In this way, when the forest frog falls down in the fall, it will enter the net and go down into the wintering pond. The small forest frog will enter the pool through the mesh, and the commercial Rana can't get out. After the net is underway, it must be checked frequently, especially after the rain, the net should be collected in time, and the product frogs should be moved into the human frog pool to prevent the frogs in the net from causing too much squeezing.
5 Some frog farmers in spring have just started breeding. The eggs produced by the frog farm are not enough and they are purchased every spring. In fact, buying a frog is more effective. In order to meet market needs or other reasons, some farms also sell a large number of female frogs in the spring. At this time, the purchasers can put them on farms. Female frogs in the spring, due to the mixture of frog oil and eggs, do not exceed 120 yuan per kilogram. Each female frog has about 4 yuan, and can produce egg clusters after breeding, each worth about 1.5 yuan. This out-of-order female frog had a high post-mortem mortality rate and had a low rate of catch-ups in the current year. According to the rate of 60% withdrawal rate, the sales price of each female frog in the fall was at least 8 yuan, and each out-of-stock female frog could obtain direct The output value of 0.8 yuan, plus an egg group, can produce about 2.3 yuan.
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