Bullfrog is an animal in the family Ranidae (Ranidae), with the scientific name Rana catesbeiana. The solitary aquatic frog is named bullfrog because its loud and loud call resembles that of a cow. It is the largest frog in North America.
Cultivation methods
Pond selection requires sufficient water sources, convenient drainage and irrigation, pollution-free water quality, quiet environment, convenient transportation, and sufficient power supply.
Construction of frog pond: Every 100 square meters is a large pond, and each large pond is divided into four small ponds. Surround the edge of the pool with 40-mesh screen silk. The screen silk is about 1 meter above the bottom of the pool. The bottom 20 to 30 cm of the screen silk is buried in the soil. The height of the pool ridge is 40 cm. The pool slope ratio is 1:3. The water level is 30 to 40 cm. The depth of the water body is not less than 20 cm. The inlet and outlet are set at the opposite corners of the large pool. Four 80 cm x 40 cm foam plastic boards are placed in each pool as a resting platform for bullfrogs, and a black sunshade net is used to shade them.
Seed stocking Before stocking seedlings, use 50 to 75 kilograms of quicklime or 10 to 15 kilograms of bleaching powder per acre for disinfection. Seedlings can be released 10 days after clearing the pond and disinfecting them. The young frogs should be soaked in 20 mg/L potassium permanganate solution for 10 to 20 minutes before releasing. Stocking density: 60 to 80 frogs/square meter in the juvenile stage and 30 to 40 frogs/square meter in the adult stage.
Feeding and management
(1) Pool inspection. The pond is patrolled once a day in the morning, noon and evening to prevent bullfrogs from escaping. The water flow is guaranteed to be uninterrupted 24 hours a day. The daily water change rate reaches 300. The water level can be controlled by raising and lowering the plastic intubation at the drainage outlet. Generally, the pond water depth is 30~ 40cm. If any abnormalities in the feeding activity of bullfrogs are found, prompt measures should be taken.
(2) The feed is mainly floating compound feed. Soak the compound feed in water half an hour before feeding to promote softening and expansion. The daily feeding amount is 7 to 15% of the total amount of frogs in the pond, and should be adjusted in time according to climate, water quality, residual bait, etc. The feeding amount should be eaten within half an hour.
(3) Graded breeding, timely classify and screen larger individuals at regular intervals, and adjust bullfrogs with similar sizes to the same pond for breeding.
For disease prevention and control, use quicklime or bleaching powder to clean and disinfect the pond before stocking the seedlings to kill harmful organisms and pathogens, and regularly splash and disinfect the entire pond with bleaching powder or strong chlorine essence. After dividing the pond, use 20 mg/L of potassium permanganate solution to disinfect the frog body and prevent mechanical damage. If sick or dead frogs are found, they should be picked out in isolation and raised in time, and disinfected with high-concentration bleaching powder or potassium permanganate solution in a timely manner.