To enable the farmed bullfrog to safely pass winter, a variety of methods can be adopted according to local conditions. Water retention frog pool to maintain a depth of 1 to 1.2 meters, the bottom of the pool to stay 6 to 9 cm thick mud so that the bullfrog diving dormant winter. After the hibernation begins, some grasses, such as water hyacinth and water peanuts, are thrown into the surface of the pond, occupying two-thirds of the surface of the pond. Or put 30 cm thick straw in the pool. This will prevent frost damage and ensure safe wintering of bullfrogs. Grass curtains are erected on the north side of the Frog Pond to form a wall of about 60-80 cm in height, and a triangular wall with high north and low height is built on both sides of the east and west sides. A bamboo-wood frame is placed 30 to 40 cm away from the water surface to cover the grass. (Repeat stacking), close to the edge of the pool, keep the water temperature around 10°C. The haystack piled a haystack at the leeward side of the frog's pool, or spread the grass first after loosening 50cm thick, and finally covered with a plastic film. When the temperature drops, bullfrogs will hibernate into the haystack and hibernate. The cover film is arched with bamboo or a "human" shaped scaffold at 30 cm from the water surface, covered with a plastic film, and kept at a pool temperature not lower than 10°C to ensure that the bullfrog spends winter. After the temperature rises, the membrane is properly removed to prevent the death of bullfrogs due to sultry hypoxia. Indoor wintering in the Chaoyang room with a brick 40 to 50 cm high pool, the pool laying loose soil 20 to 30 cm, and then put a pot of water in the pool, pot along with the height of the soil (can make the soil to maintain a certain humidity for a long time), The pool entrance is covered with bamboo or reed curtains to prevent the bullfrog from escaping. Before the room temperature drops to 0°C, seal the film in the pool, and then raise a few 40-watt bulbs in the pool to ensure safe wintering for bullfrogs. China Agricultural Network Editor
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