随着水产养殖的发展和精养水平的提高,渔用饲料的需求量也日益增加,使得菜籽饼、棉仁饼、豆饼、麸皮等常用饲料原料及鱼饲料的价格不断上涨。目前水产养殖业的产量不断增长,其比较效益反而下降。为了提高养殖效益必须在降低成本上求突破。当前最重要的就是要调整养殖品种结构,实行种草养鱼、捞草养鱼,采取以青带精的节粮型养鱼方法,积极发展草食性鱼类养殖。放养草食性鱼类的关键技术主要有三点: With the development and enhancement of aquaculture, the demand for fish feed is also increasing. As a result, the prices of common feed materials such as rapeseed cake, cottonseed cake, bean cake, bran and fish feed are continuously rising. The current aquaculture production continues to grow, but its comparative benefits declined. In order to improve the efficiency of farming must reduce costs and seek a breakthrough. At present, the most important thing is to adjust the structure of breeding breeds and implement grass-fed fish culture and grass-fishing to adopt grass-based fine-grained fish-farming methods and actively develop herbivorous fish farming. There are three main key technologies for stocking herbivorous fish: