Bullfrog reproduction and young frog cultivation technology (a) Bullfrog reproduction Bullfrogs begin to spawn in May-July, the optimal water temperature for spawning is 24-28 ℃, the spawning time is 10-30 minutes, the amount of spawning varies with the size of the individual female frog bag, the general spawning is thousands to 50,000 grains. Spawning should be picked up after 30 minutes, when picking up the eggs, people should stand in the water, use scissors to cut off all the weeds around the eggs and under the eggs connected with them, and use the egg picker to carry the eggs to the hatching pool for incubation. Hatchery pool requires 50-60 cm deep water, an area of 1.2-2 square meters, 6000 eggs per square meter hatching is appropriate. For the incubation of eggs, the water temperature should be 20-30℃ and the pH value of the water should be 7-7.5; the content of heavy metal ions should not exceed the drinking water standard. Do not disturb the water body during the incubation process, irrigation to prevent the flow and height should not be too large, pool on the shade canopy against sun exposure and heavy rain.

II) Cultivation of tadpoles The newly hatched bullfrog tadpoles are poor in swimming ability, and they should be kept in the hatchery for about ten days before they can be transferred to the tadpole pool. The tadpole pool should be cleaned and sterilized for 5-7 days before putting the tadpoles into it. The pool should not be too big, 30-36 square meters is suitable, the smallest one can be set up to 6-8 square meters, the depth of water is 0.6-1.2 meters. The suitable water temperature for tadpoles is 26-30℃, and the high temperature of ShengDong should set up a pergola, deepen the water level appropriately, and change the new water diligently. If the tadpoles have just hatched for 10 days, put 1,000-2,000 tails per square meter, if the tadpoles have hatched for 10-20 days, put 500-1,000 tails per square meter, and if the tadpoles have hatched for 30 days, put 100-130 tails per square meter. The tadpoles start to feed on single-celled algae after 4-15 days of hatching, and then various kinds of animal bait can be added appropriately, such as snail meat, fish, animal flesh, dead fish, etc., together with part of rice bran, cornmeal, soybean cake, wheat bran, and thin rice. Baiting amount: 40-70 grams of bait per day within 7-30 days, with animal bait accounting for 60%; after 30 days to metamorphosis, 40-80 grams of bait per 100 tadpoles, with animal bait accounting for 47%. Put once a day, at 4-5 o'clock in the afternoon.

Breeding of commercial frogs The breeding site should be chosen to have sufficient water, drought is not dry, floods are not flooded, and there is a lot of shade, so it is better to have a moist, warm and sunny place and a weedy place, and the area should be based on the number of breeding, which can be opened to ponds, or ditches, and the depth of the water in winter should be maintained at 1-1.2 meters. Frog ponds should be surrounded by reed curtains, bamboo fences or barbed wire, nylon nets, brick walls, etc. The fences should be 15-20 centimeters into the soil and 1.5 meters high to prevent the bullfrogs from escaping. The pool should be planted with lotus root and other large leafy aquatic plants, also can be planted with water peanuts, water lilies and other water plants, the water surface to the fence must be left 1-2 meters between the more gently sloping land, and to build frog holes for frogs, can be done with clay mud mass, can also be used as a skeleton of brick, inside and outside of a layer of mud so as not to bruise the skin of the frogs. The frog hole is parallel to the ground of the pool, 50-70 centimeters deep, 15-20 centimeters wide, 10-15 centimeters high, and there should be 2-5 centimeters deep water inside the hole. Frogs only eat movable bait and need to supplement the bait artificially by the following methods: 1. Light baiting. With 30-watt ultraviolet lamp or 40-watt black light is more effective, dark that is, turn on the light, you can see the bullfrogs gathered under the light, jumping and swallowing insects lively scene. 2、Supplement small fishes and shrimps. One method is to dig shallow pits in the frog pool, put small fish and shrimp to supplement the lack of bait; the second is to use wood and bamboo made of trough-shaped bait plate, the bottom of which is nailed to the nylon sandcloth, the water in the plate and the pool water, fixed in the shade of the frog pool, into the live small fish and shrimp. The weather turns cool, insects are scarce when using this method has a significant effect. 3, artificial capture locusts, praying mantis, mole crickets and other insects into the frog pool weeds, so that the frog natural feeding.