The technical aspects of bullfrogs are key
Extensive wild culture can be divided into two types of natural and semi-extensive breeding, common breeding methods are reservoir breeding, marsh farming, lake farming, river aquaculture, rice farming. Make full use of natural foods and other natural conditions, delineate the scope of farming, put bullfrog seedlings, appropriate feeding food, regular harvesting and capture. Its characteristics are large feeding sites, small investment, large profits, and little human intervention, but the yield per unit area is low. Intensive intensive intensive use of artificial baits and non-agricultural arable land, artificial ponds are used to build ponds, and intensive management of fine-grained farming methods. According to the differences in the breeding grounds, they can be divided into pond breeding, field farming, garden farming, indoor breeding, and constant temperature breeding. It is characterized by high culture density, high yield per unit area, high input and high output, and significant economic benefits. Seedling stocking Before laying the seedlings, dry ponds use 50 to 75 kg of lime per acre or 10 to 15 kg of bleaching powder (about 30% of available chlorine content) to be disinfected. Generally, clearing ponds are sterilized for 10 days before they are released. The pre-stocking frog can be washed with 20 ppm (gas or solution concentration units, expressed in parts per million) of potassium permanganate for 10-20 minutes. The stocking densities of young frogs are 60-80 eggs per square meter. With the changes of individual differences, they are stocked again in graded ponds. The stocking density of adult frogs is 30-40 eggs per square meter. Feed feeding Mainly based on floating water-based feed, feed should be fed to achieve "four set", that is, fixed-point, timing, quantitative, qualitative. In the first half hour of feeding, the compound feed should be wetted with clean blisters to make the feed slightly swollen. This can prevent the sewage in the bait absorption tank and prevent the genitalia of the bullfrog from developing diseases, and it can also promote the nutrient absorption of the bullfrog. Grading In the bullfrog breeding process, in order to prevent the occurrence of mutual-residue phenomenon, individuals with large differences in specifications should be screened and graded in a timely manner, and the bullfrogs with the same specifications should be adjusted to the same mouth for feeding to prevent the big frog from eating. Frog, at the same time pay attention to control the breeding density. Disease prevention and treatment In the bullfrog breeding process to be "preventive, control combination." Before the stocking, clear ponds should be disinfected, quicklime or bleaching powder should be used to disinfect, kill the enemy's harmful organisms and pathogens, and regularly disinfect with bleaching powder or strong chlorine fines. 20 ppm of potassium permanganate was used to disinfect the frog body immediately after the separation to prevent mechanical damage to spread pathogens. The diseased frogs and dead frogs were found to isolate in time. In addition, the tools were disinfected with a high concentration of bleach or potassium permanganate solution.
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