Shrimp pond mixed with large-scale elastase fish creation efficiency

Bullock fish (also known as jumping fish, flower jump, powder jump, mud bull, star spotted starfish) is a precious aquatic product. Stocking in shrimp ponds can make full use of benthic algae and organic debris at the bottom of the pond to reduce deterioration and deterioration of the bait's bottom bait, resulting in significant effects. The shrimps that can be mixed with the big salamander fish are Chinese prawns, long-haired prawns, southern white prawns, and Japanese prawns.

First, pond selection. (1) It is required that the pond has a ring ditch and a central ditch, the ratio of the ditch to the beach is 1:4, the depth of the ditch is 1.3 meters, and the depth of the beach surface is about 0.2 meters. (2) The bottom of the pond beach is soft and muddy, the bottom is too hard to make a cave, and the soft cave is easy to collapse. (3) The slope of the pond should be large, which is conducive to the breeding of benthic diatoms and increase the activities of fish. (4) The ratio of seawater in ponds is more important, and it should be between 1.008 and 1.020. The proportion of the seawater has little effect on the production of shrimp, but the low proportion is beneficial to the growth of mudskipper fish.

Second, stocking preparation. Clear the weeds and silt in the pond, then take 350g/L of quicklime and 20g/L of tea seed cake in the clear pond, and drip in the clear pond for 1 to 2 days after application. The water should be filtered through a 60-80 mesh screen. To completely remove residual drug toxicity. (1) Cultivate benthic diatoms for the giant salamander, drain the water, expose the beach and the side beach, allow the ditch and the central ditch to store water, and keep the pond for several days. Then spread poultry manure and rice bran on the beach and the beach. Each 30 g/m2, the second day of water, so that the beach and edge beach water depth of about 10 cm. (2) For prawn culture basic bait, 10 to 15 days before the release of shrimp, first calculate the amount of water in the ditch, and then apply 1 mg/L of nitrogen fertilizer and 0.1 mg/L of phosphate fertilizer at a time, every 3 to 5 days beforehand. 1 time, apply once every 7-10 days until the pond water remains yellow green or light brown.

Third, seed stocking. Since the big salamander fish are not disabled, seedlings can be used as seedlings from 2 cm seedlings to 6-7 cm juveniles. In stocking time, the large-scale mudskipper fish can be stocked in multiple batches. Generally, the shrimp seedlings are first released, and then the seedlings are magnified and replanted from mid-May to mid-June. The time for the seedlings to be stocked is the same as that for the single-cultivation seedlings. In terms of stocking density, large salamanders are counted in areas of surface shoals and side shoals, with 3 to 10 tails per square metre, and shrimps are stocked at the standard amount of single trophozoites. Fourth, feeding and management. Suntan fertilization combined shrimps to change water, drainage of pond water exposed beach, 20 kg of poultry fertilizer per acre, rice bran 15 kg, sun beach 1 to 2 days. The weather is hot and the beach time can be shortened. Frequent application of sunbathing can increase the reproduction of benthic diatoms, which is conducive to ensuring the good growth of 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 eat large smeared fish, but also drive away. Bulldog fish is less sick, and occasionally parasitizes blind fever. In severe cases, it is possible to use 90% crystals of trichlorfon in a concentration of 0.5 mg/l to splash the whole pond. The effect of changing the water the next day is better.

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