１虾蟹类对微量元素的营养需要 微量元素对维持虾蟹类的正常生长发育和繁殖有重要的意义。虾蟹类有调控微量元素浓度的能力，但随种类不同而异，鳃和消化道是调控和排出过剩微量元素的主要场所。因为虾蟹类对许多微量元素的需要量很小，而要保证配制的基础饵料和要保持饲养环境 1 shrimp and crab nutrition for trace elements Trace elements to maintain the normal growth and reproduction of shrimp and crab have important significance. Shrimps and crabs have the ability to regulate the concentration of trace elements, but vary with the species, gills and digestive tract is the main place to regulate and discharge excess trace elements. Because shrimp and crab for many trace elements in small quantities, but to ensure that the preparation of the basic food and to keep the breeding environment