Seedling price and culture method of Rana nigromaculata
The black-spotted frog is an amphibian of the genus Rana of the frog family, which is amphibious on water and land. It comes out at dusk and at night to hunt and prey. It is omnivorous in the tadfly stage and feeds on insects in the adult stage. The weight is 50 to 60 grams, and the maximum individual weight is about 100 grams. China is distributed in various provinces except Hainan, Yunnan and Taiwan. Let's take a look at the seedling prices and breeding methods of black-spotted frogs.
How much is the seedling of the black spot frog?
The price of the seedling of Rana nigromaculata is about 0.03 to 0.05 yuan, but the price varies greatly due to the specification, quality, producing area and market of the seedling. Rana nigromaculata is the reproductive season from April to July. The most wonderful part of spawning occurs in seedling fields, early rice fields or other still waters in April, and occasionally lays eggs in slow running water. Each egg piece has 2 to 3.5 thousand eggs, mostly floating on the surface. Tadpoles complete metamorphosis in more than 2 months.
Culture conditions of Rana nigromaculata
1. Temperature: the suitable temperature for the growth of Rana nigromaculata is 20: 30 ℃. When the temperature is below 10 ℃, its feeding and activity gradually weaken, when it falls below 5 ℃, it begins to hibernate. When the water temperature exceeds 32 ℃, the activity weakens obviously. When the temperature exceeds 35 ℃, it will lead to the death of Rana nigromaculata.
2. Humidity: the skin of Rana nigromaculata does not protect the tissue structure of water evaporation in the body, and it is obviously not enough to rely on the mucus secreted by the skin glands to maintain the humidity of the body surface, so it is necessary to have a pond with water in the habitat environment. there are also weeds, warm and humid environment.
3. Light: the black spot frog sleeps out day and night, afraid of direct sunlight, but weakens the light. Light can promote the metabolism, growth and reproduction of the frog, such as living in the dark for a long time, its gonads are difficult to develop and mature, and even stop spawning and ovulation.
4. Water quality: tadpoles of Rana nigromaculata require higher dissolved oxygen in the waters of frog ponds, which generally meet the standards of fishery water quality. Adult frogs and young frogs breathe with lungs, but the high dissolved oxygen in the water still has a good effect on them. PH is suitable at 7: 8, and the general salinity is not higher than 2.
Culture methods of Rana nigromaculata
1. Frog pond construction: the black spotted frog culture pond is divided into spawning pond, tadpole pond and adult frog pond. generally, it is appropriate to choose a place that is both wet and warm from the sun, and a long cement pool or soil pond is suitable. The surface of the pool must be equipped with shading boards, and floating weeds should be added to the pool water.
2. Breeding frog selection: the black spotted frog should choose the breeding frog that lays eggs for the second time, and the breeding frog that lays eggs for the second time has a higher fertilization rate. Although the number of eggs laid by the female frog in the third and fourth year is more, the fertilization rate is lower, and the hatching rate in the first year is also lower.
3. Spawning time: Rana nigromaculata lays eggs from March to July every year. The north lays eggs later, the south begins to lay eggs in March, and April is the peak spawning period. however, frog hugging, mating and spawning are closely related to air temperature, water temperature and water depth of the feeding pond.
4. Egg block harvesting: the fertilized eggs of Rana nigromaculata are collected and put into the sterilized aquaculture pond to hatch. The darker side of the egg mass is the animal pole, which must be upward, and the white side is the plant pole, which must be downward.
5. Hatching management: the water temperature of Rana nigromaculata during the incubation period must be kept between 20-25 ℃. If the water temperature suddenly rises or falls by more than 5 ℃ or strong shock can lead to frog death, the frog eggs can shake slightly after two days of incubation, become tadpoles in 3-4 days, and hatch tadpoles in about 5 days.
6. Tadpole feeding: after hatching, the tadpoles of Rana nigromaculata were cultivated in the original hatching pond or cage. 600 million 800 tadpoles were raised per square meter of water surface. They generally did not eat in the first 4-5 days, mainly fed with their own yolk sac. On the 4th day, artificial feeding began after the yolk sac disappeared.
7. Raising young frogs: there are 100,150 young black spot frogs per square meter, setting up a bait platform on the water surface instead of land, forcing the young frogs to feed and perch on the stage, first feeding them with fresh bait for one or two days, and then increasing the proportion day by day. Finally, the transition to complete artificial bait.
8. Adult frog feeding: after the young black spot frog is transferred to the adult frog pond, the food intake is large, and the growth rate is accelerated, so it is necessary to increase animal feed, 30 per square meter when the weight reaches 100 grams after 1 month, and 10 15 per square meter after 2 months. and then through short-term breeding to become a commercial frog.
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