The selection of ponds requires sufficient water sources, convenient drainage and irrigation, no water pollution, quiet environment, convenient transportation and adequate power supply.
The Frog Pond is constructed as a large pool for every 100 square meters, and each large pool is divided into four small pools on average. The pool is surrounded with a 40-mesh sieve. The sieve bowl is about 1 meter above the bottom of the pool. The bottom of the sieve bowl is buried 20 to 30 centimeters into the soil. The pool bowl is 40 centimeters high, the pool slope ratio is 1:3, and the water level is 30-40 centimeters. Water depth is not less than 20 cm. The inlet and outlet are located in the opposite corners of the big pool. Each pool contains 4 blocks of 80 cm and 40 cm foam panels as a resting platform for bullfrogs and shaded with a black shade net.
Before the seedlings are released for release, 50-75 kg of lime or 10-15 kg of bleaching powder shall be used for disinfection. Clearing ponds can be planted 10 days after disinfection. The young frogs should be washed with 20 mg/l potassium permanganate solution for 10 to 20 minutes before stocking. Stocking densities: 60 to 80 larvae per square metre for young frogs and 30 to 40 per square metre for frogs.
Feeding management
(1) The patrol pool inspection. Every morning, evening and midnight, the patrol ponds are once to prevent the bullfrogs from fleeing. The flow guarantees 24 hours a day and the water exchange rate reaches 300% every day. The plastic outlet can be used to control the level of the water level at the outlet, and the general pond water depth is 30. ~40 cm. It was found that the bullfrogs had abnormalities in the intake of rain and timely measures were taken.
(2) The feed is mainly composed of buoyant compound feed. Before the first half hour of feeding, the compound feed should be wetted with water to promote softening and expansion. The daily feeding amount is 7% to 15% of the total amount of the green frog, and it is timely adjusted according to the climate, water quality and residual baits, and the feeding amount is preferably within half an hour.
(3) Feeding by grading, timely screening of individuals with larger specifications at regular intervals, and adjusting bullfrogs of similar specifications to the same pond for culture.
The disease prevention and control seedlings shall be disinfected with quicklime or bleaching powder pond before stocking, killing the hostile organisms and pathogens, and regularly bleaching and bleaching with bleaching powder or strong chlorine fines, and using a 20 mg/l potassium permanganate solution after sub-pooling The frog body is sterilized to prevent mechanical damage. The diseased frogs and dead frogs were found to be isolated and reared in a timely manner and disinfected with a high concentration of bleach or potassium permanganate solution.
Glass Venlo Greenhouse is Spire-type glass design, design and installation of windows when more convenient and easy. Its roof slope andle can be appropriately according to the local real climate change the environment.
In Venlo Greenhouse, foundation is made of reinforced concrete and the side wall is made of brick or reinforced concrete plate. the steel frame always use hot dip galvanized light steel. Roof beam adopts horizontal girder structure and using herringbone connection. The horizontal girder bears 2 or more roofs, which is made of aluminum alloy. This material is used as roof structure material and also glass inlay material. Other beams using gutter style to minimize the section. Delighting material of the roof and side wall using 4 mm thick float glass.
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