First, the construction conditions of large-scale breeding ponds (a) The fence fence is set up with a pool of two. A 1 meter wide nylon net or window screen is generally used, of which 20 cm is buried underground. There is a support column every 1m, either bamboo poles or cement pillars, but the support poles should be placed outside the isolation net while the insulation nets should be tilted inwards. (2) Isolation Ditch In the middle of the two-layer fence, isolation trenches are also to be provided. Isolation ditch width 10 cm, depth 5 cm, sprinkle lime with lime. After rain and sunshine, it is necessary to add quicklime to the ditch in time to escape with water and to be completely safe. (3) Breeding ponds for aquaculture ponds should generally face south and east to west. The water depth is 0.5 to 1 meter. The length and width of the pool should be flexibly controlled according to the size of the farm, the conditions of the site, and the construction of the aquaculture tank. (4) Treatment at the bottom of the pond If the aquaculture pond seeps, it is necessary to first perform anti-seepage treatment on the bottom of the pond, such as padding with a triple soil, laying a plastic film, etc. Secondly, on the bottom of the treated pool, some soil with high organic matter content should be placed. Finally, put some pebbles of moderate size on the soil to attach and hide the water supply. (v) Greening Some trees and turf should be planted on the surface of land, and some vine plants should be planted near the breeding pond. It is best to climb the stems of the ponds of the breeding ponds to protect them from shading. At the same time, some aquatic plants are planted on the bottom of the culture pond to create a good living environment for the otters. Second, the construction of aquaculture ponds The construction of aquaculture ponds can be adapted to local conditions, using a variety of methods. Generally can be summarized as 3 ways: pond type, Nakajima style and gutter type. III. Precautions for the construction of aquaculture ponds (1) The water injection ports and drainage outlets are generally higher than the water surface, so that there is a certain gap between the water injection port and the water surface. There are generally two drainage outlets: one is a super-surface drainage outlet. If the water surface rises due to rain or other reasons, the excess water can be discharged out of the cultivation pond through this mouth; the other is a drainage outlet for draining water. When clear ponds are needed, all the water can be drained out of the culture ponds, generally at the bottom of the culture ponds. No matter what kind of drain outlet, we must strictly add anti-escape net cover. When draining, always check if the net cover is damaged and prevent the otters from fleeing. (II) Feeding station Feeding station is where bait is put. Usually, one feeding station can be set at an interval of 5 to 10 meters. When the aquaculture pond is wide, the feeding platform should be deep in the culture pond so that the bait to be put in is even. (3) Preventing intrusion by natural enemies When building aquaculture ponds, it is necessary to fully consider the invasion of natural enemies and mice of the otters, and necessary preventive measures must be taken to prevent natural enemies from entering the breeding ponds.
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