2. Food training should be done as early as possible, and the earlier it is, the easier it is to establish conditioned reflex, and the greater the success rate. In the early stage of domestication, live baits were insects, such as earthworms, maggots and crickets. Mainly used, a small amount of fixed dead bait and compound bait are mixed. After initial feeding with dead bait and compound feed, bullfrog gradually increased the ratio of dead bait and compound feed until it was completely used to eating compound feed.
3. Stocking density of young and adult frogs: The breeding effect of bullfrog is restricted by stocking density, food and feed conditions, and these factors should be considered when determining stocking density.
4. The stocking density of young frogs should be determined according to individual size. Generally, 50 newly metamorphosed young frogs are stocked per square meter 100 ~ 150. After 30 days, the weight reaches 25 ~ 50g. Stocking 80 ~ 100, and the weight is 60 ~ 80g. The density can be increased appropriately if conditions permit. The stocking density of adult frogs also decreases with the growth of individuals. For example, if the weight is above 150g, 30-40 frogs per square meter and above 500g10-20 frogs per square meter.
5. Overwintering management of young frogs and adult frogs: The overwintering methods of newly metamorphosed young frogs and adult frogs are basically the same. According to the characteristics of bullfrog's demand for wintering places, a safe wintering environment suitable for bullfrog can be artificially created. Before overwintering, bullfrogs should store enough energy in their bodies for overwintering. Dig up the land around the wintering pool, set up some caves, spread some soft grass in the caves, and let the bullfrogs hibernate in the caves. During hibernation, keep the water depth above 0.5 meters. On the farm, you can also artificially pile some haystacks and let the bullfrog drill under the haystacks for the winter.
6. Controlling water temperature is also the center of the whole wintering management. When the water temperature drops below 0℃ and freezes, the body fluids and blood of bullfrogs will also freeze, eventually leading to the death of bullfrogs. Therefore, in the case of continuous cold and freezing weather, it is necessary to break the hard ice on the water surface to avoid the freezing of body fluids and blood of bullfrogs.
7. If bullfrogs are protected from wintering in plastic greenhouses, the water quality will often deteriorate due to the high stocking density of frogs, the accumulation of feces and residual bait and the poor air in the greenhouses. Be sure to remove the residual bait and replace the pool water, but the amount of water changed should not be too large, and the water temperature should not exceed 2℃ before and after the water change. When the weather is clear and the temperature rises, open the door of the plastic shed to let the air circulate and increase the oxygen in the pool.