In reservoirs with fertile water, the use of cages for feeding fish species such as squid without feeding is not only practical, but also has the advantages of not occupying fish ponds, feeding without fish, and low cost. In the case of non-feeding, the use of cages in the reservoir to cultivate a 13cm species of white cardinal fish, the cost is less than 0.10 yuan, and the cost of raising a fish species in the pond in the same size is above 0.10 yuan; According to the conversion of acres, about 150,000 tails/mu, which is 30-40 times that of Inner Pond. Therefore, the reservoir cages do not feed fish to raise fish, which not only produces large-sized fish species, but also has low cost and significant benefits.
The reason why reservoir cages do not feed bait to cultivate fish species is successful and feasible. It has its ecological and physiological basis. From an ecological point of view, because the reservoir is a relatively large water area, the fluidity of the water keeps the various ecological factors and feeds in the cage constant at all times, and does not change too much because of the high density of the fish species. From a physiological point of view, because the highest density is concentrated in a small range, the amount of activity is reduced, which increases the accumulation of nutrients and is conducive to the growth of fish. The main cultivation techniques are now described as follows:

First, the choice of cages. The commonly used material for cages is polyethylene mesh. Mesh sheets with an area of ​​30m2 to 50m2 and a depth of 2m to 3m are appropriate and too inconvenient to manage. The size of the net depends on the size of the fish to be placed, and it is best to change it several times as the fish grows. For example, if the 4cm summer flower uses a cage with a 1.1cm net, and the fish grows to about 13cm, the cage with a mesh of 3cm can be used instead.

Second, the choice of location Under normal circumstances, the cage should be selected in the calm, back north to south, depth of 4m in the Bay, because of the density of plankton in these places, fish, more suitable for bait. If possible, it is better to have a certain amount of water flow, but when the flow rate reaches 2m/s, it will not work because the fish will swim at the top and consume energy, which is not conducive to fish growth.

Third, the density of cages Even in waters with relatively good water quality, the area of ​​cages should not exceed 1% of the water area. The spacing of cages should not be less than 30m, because no bait, no fertilization, plankton in the natural environment After all, biology is limited.

Fourth, density and match. The stocking density and species mix of fry are related to the composition and quantity of plankton in the reservoir and the amount of exchange of water in and outside the cage. Generally speaking, it is appropriate to put 200 to 300 summer flowers per cubic meter of water. In terms of species mix, if the water quality is very high and there are many small plankton, the white pheasant will be raised. When the proportion of large plankton is large, the calyx should be the dominant species.

V. Daily Management The main task of day-to-day management is to check the cages. When the cage is left in water for a little longer, there will be many attachments. Its main components are filamentous algae and some smooth glial bodies. These attachments will clog the mesh of the cage and prevent the exchange of water inside and outside the cage. Therefore, it should be cleared regularly. The cleaning methods include mechanical washing (half a month), sun exposure, biological removal (tilap fish, tilapia, and head lice), chemical removal (mesh treatment with copper salt), caisson ( Sink into the water 3 ~ 5m, so that attachments stop photosynthesis) and so on.

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