NOVELTY - Cultivation of silver carps and bighead carps involves preparing organic fertilizer comprising 55-60 pts. wt. poultry and/or livestock manure, 22-26 pts. wt. cassava residue, rice bran, and/or cow dung, 12-18 pts. wt. peat, 0.2-0.5 pts. wt. fermenting yeast, 0.3-0.8 pts. wt. photosynthetic bacteria or effective microorganism bacteria, 1-5 pts. wt. corn syrup, 0.01-0.05 pts. wt. potassium dihydrogen phosphate, and 0.002-0.008 pts. wt. trace elements; breeding 95-105 pieces bighead carp and 15-25 pieces silver carp per acre farm; and fertilizing with organic fertilizer.    USE - Cultivation of silver carps.    ADVANTAGE - The method has simple and easy preparation, low cost, economical and environment friendly, has scientific waste usage, improves growing environment of bighead carp, and reduces bighead carp diseases.    DETAILED DESCRIPTION - Cultivation of silver carps and bighead carps comprises preparing organic fertilizer by taking main ingredient consisting of 55-60 pts. wt. poultry and/or livestock manure, conditioner consisting of 22-26 pts. wt. cassava residue, rice bran, and/or cow dung and 12-18 pts. wt. peat, fermenting agent consisting of 0.2-0.5 pts. wt. fermenting yeast and 0.3-0.8 pts. wt. photosynthetic bacteria or effective microorganism bacteria, and auxiliary agents consisting of 1-5 pts. wt. corn syrup, 0.01-0.05 pts. wt. potassium dihydrogen phosphate, and 0.002-0.008 pts. wt. trace elements; adding conditioner into main ingredient; adjusting moisture and humidity; adding auxiliary agents; uniformly mixing; putting mixture into fermenting stack; fermenting at 50 degrees C while turning everyday for 7-10 days to decompose; air drying organic fertilizer until moisture content is less than 30%; pulverizing; packaging; putting 95-105 tails bighead carp and 15-25 tails silver carp per acre farm; breeding and managing daily; fertilizing with 8-14 kg organic fertilizer per acre farm for first week; applying 3-5 kg biological fish fertilizer per acre farm for second week; and applying 1-3 kg urea per acre farm for last week.