Cage fish farming is a scientific method of fish farming which gradually developed on the basis of temporary farming. It is assembled into a box with a certain shape by using net pieces, and is set in a larger water body, water is exchanged through the mesh, so that a living water environment is formed in the net box. Cages can be used for high-density cultivation of fingerlings or intensive cultivation of commercial fish. The method of cage fishing has the characteristics of mobility, flexibility, simplicity, high yield, and wide adaptability to water areas. It has a broad prospect for development in our country's marine and freshwater aquaculture industry.
A. The characteristics of cage fish farming
1.Cage fishing could make full use of natural water bodies such as rivers, lakes, reservoirs and their bait to develop cage fishing farming. It can not only breed fish species, but also grow adult fish. Especially in areas which is lacking of ponds, the large water surfaces can be used to set up net cages to cultivate fish species in situ and grow adult fish in situ, which has a positive effect on improving the survival rate and production of fish.
2.Cage fishing farming can be high-density intensive and the yield per unit area can be dozens or hundreds of times higher than that of the pond. The reason is that fish farming in cages actually uses the superior natural conditions of the large water surface and integrates the measures of dense and intensive farming in small water bodies to achieve high yields. In the process of breeding, the water inside and outside the cage is constantly exchanged, taking away the excrement of fish in the cage and the residue of feeding bait, bringing in oxygen and plankton, so that the cage can maintain a high degree of dissolution Oxygen, so even in the case of high density of fish in the cage, there will be no hypoxia and deterioration of water quality, and ensure that the feed organisms needed for silver carp and bighead carp cultured in the cage are continuously supplied. In addition, the fish are kept in net cages, which avoids the harm of predators, and can detect fish diseases in time, ensuring a high survival rate and excellent recovery rate.
3.Cage fishing farming has the advantages of mobility and flexibility, and can be invested in batches and developed gradually. It is also called nomadic fishery because it is convenient to feed and manage, easy to fish, and once the water body in which the cage is set up is not suitable, it can be moved at any time.
B. The key of cage fishing farming
1. Choose a place with abundant natural bait and a certain flow of water to set up a cage.
2. Choose a suitable cage structure and installation method. Including the shape, size, arrangement and spacing of cages.
3. Determine the stocking fish, size, density and polyculture ratio according to water conditions, so as to give full play to the production potential of the water body.
4. Effectively do a good job of feeding, preventing escape, preventing diseases, preventing predators, etc., especially keeping the walls of the cages clean to prevent the meshes from clogging and affecting the exchange of water.