饲料是发展养鱼的重要物质基础。在混养密放的高产鱼塘中,鱼类能吃到天然饲料是很少的。要使鱼类得到充足的食料而较快地生长,必须投喂人工饲料,并适当施肥,才能满足各种鱼类的摄食需要,提高鱼产量。各地养鱼高产实践表明,每养大1千克草鱼、鳊鱼,约需精饲料2千克,青饲料15千克;养大1千克鲤、鲫、鲮、罗非鱼等杂食性鱼类,约需精饲料 Feed is an important material basis for the development of fish farming. In mixed high-yielding fish ponds, fish can eat very little natural feed. For the fish to get enough food and grow faster, they must be fed with artificial feed and fertilized properly to meet the feeding needs of various kinds of fish and increase their fish production. The practice of producing high-quality fish around the country shows that for every 1 kg of grass carp and bighead carp to be raised, about 2 kg of concentrate and 15 kg of green fodder are required; and 1 kg of omnivorous fish, such as carp, crucian carp, pomfret and tilapia, feed