中国对虾配合饲料入水后营养成分的流失及其对水环境的影响↑（*）

对中国对虾配合饲料浸于水中营养成分的流失及其对水环境的影响作了分析，发现目前生产使用的配合饲料水中稳定性较差。实验结果表明：１．配合饲料入水后便会失去部分重量，５分钟好达１２．４￣１３．２％，１２０分钟可达１７．０￣２３．９％。配合饲料在浸泡过程中，各营养成分的溶失速度不一，水易溶性物质溶失迅速且彻底，造成溶失比例不一致，破坏了配合饲料原有的营养平衡体系，降低了其营养价值。３．配合饲料投入水中会引

THE LOSS OF NUTRIENTS OF SHRIMP FORMULATD DIET SOAKED IN WATER AND ITS EFFECTS ON THE WATER ENVIROMENT

This paper mainly deals with the loss of nutrients in formulated diet forshrimps while soaked in water and its effects on the water environment. We find that thestability of the diet which is produced and used now is relatively poor in water. Here arethe results of the experiments. 1. When soaked in water, the diet would lose part of its weight, which may come to12.0- 13.3% of the total in 5 minutes and 17. 0- 23.9% in 2 hours.2. The dissolving speed of each ingredient varies while being soaked in wate.Thewater soluble materials run out rapidly and thoroughly, thereby the balance of thenutrients system is broken down because of the uneven proportion of dissolution. Thisgreatly lowers the nutrient value. 3.The water field would be rich in nutrition once the diet is casted into water.Thediet in use would increase the chemical oxygen dissociation (COD) at a rate of 0.056mg / L per day,This can pollute the water quality. In consideration of the disadvantages mentioned above,we suggest that the watersoluble materials should be coated first before they are made into pellets as a method toimprove the diet quality.