CATDOLL : CATDOLL: 40 mu fish pond (water depth 2 to 4 meters, water quality is relatively fertile, stocking density is high, mainly silver carp, bighead carp, grass carp, semi-intensive breeding, no aerator, annual income, please give me some advice

The natural productivity of silver carp without artificial bait is 300-400 catties per year, so how much you invest is the key, but the fish carrying capacity of a fish pond is limited. According to the pond with an aerator, the output of fish farming is between 2500-3000 catties. Since silver carp feeds by swallowing and filtering zooplankton and phytoplankton, the annual output of silver carp per mu does not exceed 1000 catties. According to the current market price of 4 yuan per catty for silver carp and 6 yuan per catty for bighead carp, the annual income is 5000 yuan. Excluding the cost of fish seed and the cost of fertilizers/other fertilizer and water products + the cost of drug control + labor + water fees. The average annual income per mu is 2000 yuan. Please bless the Buddha.