Pollution-free polyculture technology of channel catfish and white silver carp

2006 At the beginning of January, 12.5 kilograms of bleaching powder were used to clean and disinfect the pond. White silver carp is produced locally, with specifications of 4-6 tails/kg, and 75 tails per mu. The matching ratio is 1: 2. Based on the weight percentage of fish in the pond, 4 accounts for 1%-2% before the end of the month. During the feeding stage, feed 1 times a day, and then 1-2 times a day; 5 days, and a total of 6.5 kilograms of pellets will be fed throughout the period. Start the aerator in a timely manner to increase oxygen and release harmful gases through aeration. Among catfish diseases, trichozoa and hemorrhagic disease have the highest incidence rate and the greatest harm. The former uses a mixture of copper sulfate and ferrous sulfate (5: 2)5 ponds can produce 4.23 million kilograms of adult fish, with an average yield of 846 kilograms per mu. The total output value is 374 yuan. The sales price per kilogram of fish is: catfish 10 yuan, silver carp 7 yuan, and silver carp 4.8 yuan. The total profit is 2. Catfish should not be raised temporarily at high density.