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Shrimp and big mudskipper polyculture mode
The big salamander fish are stocked in shrimp ponds, which can make full use of benthic algae and organic debris at the bottom of ponds to reduce the deterioration of water quality and cause deterioration of water quality. The giant salamander fish feed on benthic diatoms and organic detritus. The food chain is short. Its diet changes from the carnivorous nature of juvenile fish to the juvenile fish. It maintains the plant's feeding habits from juvenile to adult fish. Therefore it does not compete with prawns and can coexist peacefully with prawns. The shrimps that can be mixed with big salamander fish are Chinese prawns, prawns, prawns, prawns, etc. 1. Pond selection: Ponds with mixed polyculture of shrimp and big salamander fish. 1Requires that the pond has a ring ditch and a central ditch. The area ratio between the ditch and the beach is 1:4, the depth of the pond ditch is 1.3m, and the depth of the beach surface is about 0.2m; 2 pond beach The bottom sediment is soft argillaceous, the bottom sediment is too hard to make the cave, and the soft cavern is easy to collapse. In short, the bottom sediment is too soft and hard to be conducive to the survival of the big mudskipper fish; 3 the slope of the pond and dam is large, which is favorable for benthic diatom breeding , increase the activities of fish. 4 The seawater ratio in the pond is more important, and it should be between 1.008 and 1.020. The proportion of the seawater is not significant to the shrimp, and the low proportion is beneficial to the growth of the mudskipper fish. 2, before stocking preparation: Clear weeds and silt in the pond, and then take the water with lime 350mg/L, bleaching powder 80mg/L, tea seed cake 20mg/L clear pond, after treatment 1 ~ 2 days into the water wash pond, the water to go through 60 ~ 80 mesh sieve mesh filter. Drainage several times to thoroughly remove residual drug toxicity. 1Cultivate benthic diatoms for big salamander fish, drain the water, expose beach surface and side beach, store water in ring ditch and central ditch, and keep the pond for several days. Then spread 30g of poultry manure and rice bran on the beach and beach side respectively. /m2, Intake of water on the second day, so that the water depth of the beach and side beach is about 10cm; 2 is the basic bait for shrimp culture, which is carried out 10 to 15 days before the shrimp is planted. The amount of water in the ditch is calculated first, and then 1mg of nitrogen fertilizer is applied each time. /L, phosphate 0.1 mg/L, applied 1 to 3 to 5 days in advance and 1 to 7 to 10 days in the later period, until the pond water stays yellow-green or light-colored. 3, seed stocking: As the big mudskipper fish do not disability, from 2cm seedlings to 6 ~ 7cm juvenile fish can be used as seedlings, shrimp seedlings specifications with single pond. In stocking time, the large-scale mudskipper fish can be stocked in multiple batches. Generally, the shrimp seedlings are first released, and then the fry can be magnified. From mid-May to mid-June, the seedling stocking time is the same as that of the single-cultivation seedlings. In terms of stocking densities, 3 to 10 tails per square meter (m3) of large salamanders are calculated based on the area of ​​the beach and the side beach. The shrimps are stocked at the standard amount of the single ponds. 4, feeding and management: Sun flooding combined with shrimp when the water change, drainage pond exposed beach, Mu Shi poultry fertilizer 20Kg, rice bran 15Kg, dry beach 1 to 2 days, the weather can be shortened hot beach time. Frequent fertilization of Suntan increases the amount of benthic diatom breeding to ensure good growth of the big borer fish. After the shrimps are harvested, the number of sunbathings should be increased, especially in winter, to increase the water temperature. The big salamander fish is a brackish freshwater fish, and it is generally advisable to keep the proportion of seawater about 1.012. To clear pond crabs and wild fish, kingfishers and egrets will feed on the big smeared fish, and they will drive them away. Bullock fish less sick, occasionally parasitized blind fever, severe when the concentration of 0.5mg/L can be used 90% crystallized trichlorfon whole pond spit, the next day changing the water better.