How to increase bullfrog production?

How to increase the yield of bullfrogs? -------------------------------------- The breeding of commercial frogs refers to the process of growing abnormal young frogs into commercial frogs, which is the last link of the whole bullfrog breeding and the most critical production procedure to determine the success or failure of production. At present, commercial frog culture can be divided into intensive culture and extensive culture of two ways. Extensive breeding, that is, surrounded by anti-escape facilities to build a relatively wide place, bullfrog larvae are placed in this natural environment to eat natural food and natural growth, to reach the commodity specifications after fishing for sale; and intensive breeding is to dig smaller artificial ponds, using artificial feeding, high-density artificial breeding, this breeding mode of production and survival rate are very high, is now more commonly used breeding mode, the following emphasis. Introduce this farming method. ----------------------------------- I. Construction of breeding grounds 1, frog pond: commercial frog breeding pond, generally open digging pond, in order to save farmland and cost, can use pond weir, lotus pond and small ponding pond slightly finishing transformation. The location should be selected in a place with flat terrain and sufficient water source, covering an area of 100 square meters to 300 square meters, pool depth of 0.8 meters to 1 meter, and water storage capacity of 30 cm to 40 cm. The soil pool should be surrounded by nets to prevent frogs from escaping: high-yield intensive breeding can also build a special cement pool with an area of 15 square meters to 30 square meters. The pool is 1 meter deep, and the water storage depends on the size of the frog body. It is made of concrete. The bottom of the pool and the wall surface are leveled with cement. The slope of the bottom of the pool should be large to ensure that one end is deep when raising frogs, which is the main habitat of frogs. The other end is shallow and often exposed to the bottom of the pool, so that frogs can come here to eat and rest. The bottom of the pool should also be inclined to the drain to ensure that the pool water can be drained. In order to prevent frogs from escaping, the top of the surrounding pool wall should be cast or built into an inward 10 cm eaves. The cement pond has a high yield. At present, frogs can be produced 15 kg per square meter in China, which is suitable for intensive high-yield frog breeding. 2. Small environment of frog pond: In order to ensure that cattle borers can grow and develop well, a good ecological environment should be created for bullfrogs. Some aquatic plants such as lotus root, arrowhead and calamus can be planted in the frog pond, which is suitable for bullfrogs to inhabit; flowers, grass and shrubs should be planted on the land and slope in the frog pond, so as to facilitate bullfrogs to inhabit and attract insects as bait for frogs at ordinary times; In order to prevent the impact of high temperature on bullfrogs in summer, a shade shed should be set up on the south bank of the frog pond in spring, some climbing vines such as pumpkin, loofah and grape should be planted, and the bullfrogs should climb the shade shed to rest in summer during the high temperature season. Through this arrangement, the ecological environment of the whole frog breeding pond is more suitable for the life and growth of bullfrogs. 3. Cleaning and disinfection of frog breeding pond: The newly built cement pond should be soaked in water for 15 days before use for alkali removal, and the old water should be drained and replaced with new water before stocking young frogs; soil pond such as newly opened pond should also be soaked in water for 5~7 days before use to remove excessive heavy metal salts. Before stocking, the cement pond should also be washed with bleaching powder with concentration of 1 mg per liter or quicklime solution with concentration of 20 mg per liter to disinfect the bottom and wall of the pond; The soil pond should be disinfected by sprinkling 90 g ~110 g quicklime or 7.5 g ~15 g bleaching powder per square meter. -------------------------------------- II. Breeding, feeding and feeding management of young frogs The stocking quantity of young frogs should be decided according to the size, food condition and feeding management level of frogs. Earthen ponds are generally stocked with newly metamorphosed (4 g ~5 g) young frogs: 100 ~120 per square meter; the stocking amount of cement ponds can be increased by 1~2 times. 1, frog artificial bait: in high-density intensive farming, only natural bait can not meet the needs, must be fed artificial bait. At present, the artificial baits used in frog breeding mainly include insects lured by light, fresh baits such as artificially cultivated earthworms and maggots, and artificial granular baits. Artificial compound granular bait can be prepared according to different development stages and sizes of frogs with different specifications and particle sizes, with low feed coefficient and cost. In addition, some drugs can be added properly during preparation, and it can also play a role in preventing and controlling diseases. The experiment shows that as long as the young frogs are just metamorphosed, live bait such as earthworms and small fish and shrimp and static bait such as granular bait are fed together to activate the static bait under the drive of live bait. The young frogs can eat static bait, and the effect is very good. This solves the key problem for intensive breeding of bullfrogs. 2, feeding management: under artificial intensive conditions, bullfrogs eat a large amount of food, feces are also more, easy to pollute and deteriorate water quality, which will cause disease, this phenomenon is more prominent when raising cement ponds. Therefore, the cement pool should be washed frequently, replaced regularly and disinfected with quicklime at a concentration of 20 mg per liter or bleach at a concentration of 1 mg per liter every 15 days from mid-April to mid-October. When the water temperature rises above 32 ° C, bullfrogs will have loss of appetite and will die when it continues to rise to 35 ° C. At this time, in addition to using climbing vines to shade, if necessary, add new water with lower temperature to the river, and take all measures to control the water temperature in the pool below 32℃ to ensure the normal life and growth of frogs. Because of the large density of frogs, the individual size of young frogs will vary after a period of feeding because of uneven feeding of food and differences in physical strength among individuals. Bullfrogs have the bad habit of eating big and small, so they should be raised in separate pools according to their size in time to improve the survival rate of frogs. When the specification reaches 25g ~ 50g, adjust to 60 ~80 per square meter; when the specification reaches 100g, adjust to 30 ~40 per square meter; when the specification reaches 150g, adjust to 20 ~30 per square meter. -------------------------------------- Bullfrogs are good at climbing and jumping, so we should check the escape prevention facilities frequently, repair them in time if they are damaged, observe whether there are snakes, rats and other enemies frequently, and kill them in time once they are found to ensure the safe growth of frogs.