Cages are a new type of facility in efficient aquaculture. In the cage culture production, if the mesh is appropriate, not only can the netting material be reduced, the cost of the cage can be reduced, and the mesh can not be easily blocked, and the water exchange condition is also good. Therefore, in the cage culture, do not neglect to select the mesh for the fish. The methods are as follows: 1. Reasonably selected mesh 1. The purpose of the selection of conventional fingerling nets is to select 1.0 cm to 1.5 cm mesh for the summer fish cage, but 1.2 cm to 1.3 cm is the best. When weaving 1.2 cm mesh, the allowable error in processing is 0.1 cm. In this way, the largest mesh after weaving the mesh is 1.3 cm, the smallest mesh is 1.1 cm, and when the summer fish species are stocked, the degree of fish is 1.1 centimeters. 2. The purpose of grading cultivating fish seedlings is to use net cages to cultivate fingerlings. If the mesh is too large, the date of entry of summer fish seedlings will be affected. For example, oystercatchers, squid and summer fish can only be released when they are more than 6 cm in length. In a 1.5 cm net cage, this actually delays the entry date of the summer fish species and affects the growth period of the fish species. If the mesh is too small, the mesh can be easily blocked by algae or organic suspended matter, which affects the drainage volume of the cage and is not conducive to the growth of fish species in the cage. At present, the use of a 1.0 cm net cage in China has been relatively dense. The largest mesh area of ​​such meshes is 0.25 square centimeters, which is about half that of a mesh with a mesh size of 1.4 centimeters. At present, new techniques for classifying fish species using cages with different mesh sizes (1.0 cm to 1.8 cm) are being promoted and applied. The correct choice of mesh size must also understand the relationship between full body length and body height, which is generally based on the principle that body weight is less than 2 times the length of the fish body, and the body height of the fingerling is selected as the basis for selecting mesh size. Second, the timely adjustment of the mesh Since each fish's body height is less than twice the perimeter, so in the net cage for polyethylene to be used as a reference to determine the size of the selected mesh. For example, if the length of the fish species to be placed is 10 cm, the size of the catfish is not more than 3.2 cm, the grass carp does not exceed 2.0 cm, and the carp, catfish and carp do not exceed 2.53 cm. According to this specification, the size of the mesh can be selected so that fish species that have been placed into cages will not escape due to excessive mesh. If carcasses stock carnivorous fish, and the mesh material is not polyethylene, as long as the cable has a certain degree of flexibility, and the size of the mesh is selected according to the above criteria, sometimes fish escape occurs, then the mesh size should be reduced. . This is to prevent the escape of fish as a selection of mesh standards. In fact, in the course of fish breeding in cages, due to the continuous growth of fish species and the continuous appearance of small mesh size, the method of adjusting cages can be used to gradually expand the mesh and increase the number of meshes. Exchange the amount of water to solve the problem.
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