Through the tele-microscope, the microvilli lying the gut of the group B and C was tidier, thinner and longer than that of control group, this indicated the absorption area became bigger and the FCR became more efficient.

• 电镜观察发现C组和B组的鳗鲡小肠细胞微绒毛排列整齐、细而长,吸收面积增大,从而提高了对饲料利用率,D组鳗鲡小肠细胞的微绒毛稀疏、短,排列不均匀。