First, cave wintering bullfrogs have the habit of burrowing caves, you can loosen soil around the frog pool in advance, and dig a number of caves with a diameter of 15 cm and a depth of 1 m at the sunny leeward and flat water level lines, and keep them moist so that the bullfrogs can Into the hibernation.
2. Dive the wintering frog pool to maintain a water depth of 1 m to 1.2 m, and leave mud at the bottom of the pond to be 6 cm to 9 cm thick, so that the bullfrog can stray and silt over winter.
3. Hibernating and winter hibernating At the beginning of the winter, the pond puts in some aquatic plants, such as water hyacinth and water peanuts, which accounts for about two-thirds of the surface of the frog pond, or lays straw 30 cm thick in the pool to prevent frost and ensure bullfrogs. Wintering.
4. The wintering of the grass curtains builds a wall on the northern side of the Frog Pond, and the triangular walls of the north and south are built on the east and the west. A bamboo frame is placed at a distance of 30 cm to 40 cm from the surface of the water. Keep close together and keep the water temperature at around 10°C. Bullfrogs can safely pass winter.
5. When the haystack is overwinter, it is piled in a haystack at the leeward side of the frog pool, or it is first laid loosely and is 50 centimeters thick. The grass is piled on top to keep it moist and then covered with a plastic film. When the temperature drops, bullfrogs drill into haystacks to hibernate.
Sixth, the film overwintered on the frog pond 30 centimeters away from the surface of the water, arched with bamboo or "human" shaped scaffolds, covered with plastic film and sealed, it is best to cover a layer of net, wind blow the film, so that the pool temperature Not less than 10°C, make sure that the bullfrog spends winter. After the temperature rises, it is necessary to properly remove membranes to prevent the death of bullfrogs due to sultry hypoxia.
7, cylinder jar over the winter cylinder altar first loaded with some dirt, the middle high, low around the shape of a steamed bread, and then put a little water, so that the height of soil slightly moist, a small amount of water at the bottom, covered with water grass. Around the cylinder altar and above are covered with straw and other insulation materials, with plastic film insulation, pay attention to ventilation, can also use plastic barrels poured into the boiling water, placed in the cylinder, the altar to increase the temperature. Wintering with this method works well, but it can only solve the winter of a few bullfrogs.
Bullfrog hibernation is generally from November to March the following year, the entire process of about 100 days. Production practices have proven that bullfrogs safely pass through winters in the following ways: