Culture techniques of Rana nigromaculata

Prepare a rice field that is high, flat and far from noisy areas such as urban areas, and disinfect pipes and anti-escape nets. Then, according to the 1:1 ratio, the female and male frogs are selected and put into the pool, and then injected into the high water level of 40cm, and the greenhouse is built to allow them to breed. After hatching, feed well and change water regularly can make the tadpoles grow up. When the tadpoles grow up, they can grow into frogs by doing a good job of basic management such as escape prevention, water and fertilizer, pest control and so on.

Key points of culture techniques of Rana nigromaculata

1. Site selection

The breeding ground of Rana nigromaculata should be guaranteed to have a certain height and should not be raised in low-lying places to avoid flooding. Then make sure there is plenty of clean water around. It is generally appropriate to choose rice fields in noisy areas such as high-lying, flat and far away from urban areas. After selecting the site, we should disinfect it and remove the natural enemies in the rice field, such as leeches, lobsters and so on. Prevent damage during tadpoles and improve the hatching rate of seedlings. Then do a good job in the pre-burying of the pipeline, prevent water leakage, lay the ground grid, prevent the black spot frog from escaping, and then do a good job of bird prevention to create a safe growing environment for the black spot frog.

2. Artificial breeding

First of all, we should put the black spot frog with a female-to-male ratio of one to one into the breeding pond. The water level in the pool is kept at about 40 centimeters, and several foam boards are used as feed feeding and resting places for black spot frogs. After entering October, due to the temperature drop, it is necessary to do a good job in the construction of the greenhouse. And because the temperature difference between day and night is relatively large, we should also pay attention to raising the water temperature at night. Through these methods, we can reduce the hibernation time, prolong the development period, promote the gonadal development and prolong the reproduction time of black spot frog. Then according to the actual situation to control the reproduction methods, mainly natural reproduction and artificial induction of labor. April to June is the main breeding time of Rana nigromaculata.

3. Cultivate tadpoles

After successful mating, tadpoles can hatch in about 3 days. Newborn tadpoles should be properly fed with rotifers, egg yolks, etc., and sprinkle them into the water. Then, after a week or so, feed the tadpoles with special feed, or make it with fish meal, soybean meal and so on. Control the breeding density, about 800 per flat in the early stage, reduce about 400 after two weeks, and finally keep the big tadpoles at about 200 per flat. Then feed at least twice a day, according to the weight of tadpoles to control the amount of feed, keep at about 8%. After a month or so, the tadpoles enter the metamorphosis stage, at this time to put some water hyacinth and other plants in the water to facilitate the tadpoles to land. Finally, we should pay attention to the regular change of water to ensure the water quality, and the water level is controlled at about 30 cm.

4. Adult frog culture

At present, the main method of breeding adult frogs is rice field culture. Because adult frogs can feed on pests that harm the growth of rice, and the excrement produced by black spot frogs can be used as fertilizer to provide nutrition for rice. Therefore, it can reduce the amount of chemical fertilizers and pesticides and reduce environmental pollution. Rice and black spot frog belong to natural green food. However, we should pay attention to anti-escape measures, and then dig a good frog ditch to facilitate the growth of black spot frogs. Rice varieties with strong fertilizer tolerance and not suitable for lodging should be selected. The release time of adult frogs should be controlled about half a month after rice seedlings turn green, and about 3500 adult frogs of about 15 grams per mu should be put in.

The above is the introduction of the breeding technology of Rana nigromaculata. I hope it will be helpful to everyone.