In order to achieve low cost and high efficiency and obtain the desired economic benefits, the mixed fish in spring ponds must pay attention to the following matters: 1. The area of ​​polyculture ponds. Polyculture ponds should be large and deep. Each pond area should be more than 5 mu and the water depth should be more than 2 meters before considering the polyculture of upper, middle and lower layers. It is generally not suitable for polyculture because it has an area of ​​1 to 2 mu and a small and shallow pond with a water depth of 1.5 meters or less and ponds with relatively simple feed types and newly excavated ponds. Second, highlight the main fish breeds. The practice of polyculture in ponds is not the type of polyculture the better, but rather highlight the main fish breeds. General polyculture 1 to 3 species, not too much. Should choose suitable for the local environment, market best-selling, high yield, easy to breed, good varieties of polyculture. Third, the mixed relationship between eating fish and fertilizer fish. When the amount of concentrate is small, the polyculture ratio of eating fish (grass carp, herring, squid, head fish, etc.) and fertilized fish (carp, squid, etc.) is approximately 1:1. In the case of sufficient concentrates and large amounts of feed, the fish production must be increased, and the proportion of polyculture of food-eating fish should be increased accordingly, which can be adjusted to 2:1. Fourth, pay attention to the polyculture of grass carp and herring. Grass carp enjoys fresh water quality and herring is more resistant to fertilizer and water. Grass carp and herring are polyculture, and they are mainly fed with grass carp before August, supplemented by herring feeding. After the grass carp is marketed, herring rearing will be emphasized. Fifth, pay attention to the polyculture of tilapia and tilapia. Tilapia juveniles use plankton as their main feed. If they are mixed with trout, cross-stocking should be adopted. That is, the first half of the year will focus on the rearing of trout and wait until it reaches 0.75 kg after 6~8 months. , and then focus on raising tilapia. Sixth, the proportion of polyculture of carp and carp. The proportion of polyculture of common carp and carp is generally 3 to 5:1. However, if a large amount of powdered feed can be fed regularly, the ratio between the two can be 1:1. In the production, the small-sized squid is mixed with the larger-sized squid and the stocking density of squid is controlled. The ratio of carp and squid can reach 1:3 to 5. Seven, polyculture taboos. (1) Fish species that have the same diet and habitat layer are not suitable for polyculture. (2) The fierce carnivorous fish are generally not polycultured with other food fish. Only when the brooding fish ponds or adult fish ponds with a large amount of miscellaneous fishes are relatively large, or when the tilapia over-breeding is to be controlled, it is possible to polyculture some high economic value. Salmon, California salmon, and other carnivorous fish.
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