流化床制备大黄鱼仔稚幼体微胶囊饲料的应用研究

Study on preparation of the microencapsulated diet for larvae of Pseudosciaena crocea using fluidized bed coating process

将基础饲料先制成球丸,用流化床制备乙基纤维素包衣的微胶囊饲料。微胶囊饲料粒径为150～840μm的达70%。微胶囊饲料的包含率和脂类包埋率分别为97.2%±1.7%、63.2%±3.7%,在35.0‰的NaCl溶液中浸泡20、40、60min,氮保留率分别为73.6%±2.6%、65.8%±3.5%、53.7%±4.2%。扫描电镜(SEM)观察微胶囊饲料表面为均匀光滑一致的包衣膜,形状规则且无粘连现象。将微胶囊饲料饲喂15日龄大黄鱼25d作为实验组,对照组饲喂冷藏桡足类。实验结束时,实验组大黄鱼鱼苗的成活率虽显著低于对照组,但体重大于对照组。

The basal diet as core material was made into ball-shape granule and the diet microencapsulated with ethyl cellulose was prepared using fluidized bed coating process.Over 70% of the microencapsulated diet were between 150-840μm in size.The inclusion efficiency and lipid encapsulation efficiency of the microencapsulated diet was estimated to be 97.2% ± 1.7%, 63.2% ± 3.7% respectively. The nitrogen retention efficiency of the microencapsulated diet incubation in 35%0 NaCI solution for 20,40,60min was 3.6% ± 2.6% ,5.8% ± 3.5% ,53.7% ±4.2%, respectively. The surface superstructure of microencapsulated diet observed by scanning electron microscopy（SEM） was of regulation and uniformity, not conglutination.The larvae of Pseudosciaena crocea of 15d after hatching were fed with the microencapsulated diet for 25d as experimental group and the control was fed with frozen copepods.At the end of the experiment,the survival of the larvae in experimental group was significantly lower than that in the control group, however the body weight was greater than that in the control group.