喂鱼时，常有不少颗粒饲料未被鱼吞食而沉入水底，以致造成浪费。英国研究人员通过试验发现，在鱼饲料中添加微量的甜菜碱（从甜菜加工副产品中提取出的一种化合物），可以吸引鱼类吞食饲料，减少饲料浪费。甜菜碱的添加量为0．5％－1．5％，对各种鱼类均有强烈的吸引力。饲料 Feeding fish, often have a lot of pellets were not swallowed fish and sink into the water, resulting in waste. British researchers through experiments found that adding trace amounts of betaine (a compound extracted from sugar beet by-products) to fish feeds can attract fish to swallow feed and reduce feed wastage. The addition of betaine is 0.5% -1.5%, a strong attraction for a variety of fish. feed