在我国鱼用配合饲料的生产中,目前主要是以骨粉、蚌壳粉、食盐等作为盐类添加成分。但在我们的研究中发现,草鱼配合饲料中添加骨粉不如添加荻野珍吉(1979)混合盐能提高草鱼生长率。为了解草鱼对配合饲料中钙、磷、镁、铁的消化利用情况并进一步探讨不同形态盐类为添加效果,我们进行了草鱼对不同形态盐类消化能力的测定。材料和方法试验鱼为本所试验场人工繁殖并培育的一冬龄草鱼,个体均重200克左右。试验前一周将鱼运回实验室暂养。试验在水容积为 In our country with the production of fish feed, the main is currently bone meal, clam shell powder, salt, etc. as a salt added ingredients. However, in our study, it was found that the addition of bone meal to grass carp compound feed was not as good as adding the mixed salt of Ogino Geji (1979) to increase the growth rate of grass carp. In order to understand the digestion and utilization of calcium, phosphorus, magnesium and iron in compound feed by grass carp and to further explore the effect of adding different forms of salt, we conducted the determination of digestibility of grass carp in different forms of salt. MATERIALS AND METHODS The test fish was a winter-aged grass carp that was artificially propagated and cultivated at the test site of the institute. Each of them weighs about 200 grams. Fish will be transported back to the laboratory one week before the test. Test volume in water