The invention discloses a method for improving
overwintering survival rate and qualities of
oreochromis niloticus fries. Before
overwintering, feeds with 12% to 14% fat level are fed to the fries, and
soybean oil and
fish oil are blent in a proportion of 4:1 to form fat sources. Fatty acids--linoleic acids and linolenic acids which are necessary to growth of
oreochromis niloticus are mainly increased so as to improve energy reserve. Low-
temperature stress resistance of the
oreochromis niloticus can be improved by low temperature
acclimatization and the low temperature adaptability is improved. During
overwintering, feeds with 1.5% to 2% compound Chinese herbal
medicine are fed to the fries, so that damages of the low-
temperature stress to fish bodies can be effectively relieved, the non-specificity
immunity of the fish bodies is improved, and the overwintering
survival rate and fry qualities are improved. Meanwhile, according to the above three steps,
material selection and facility configuration are easy, the price is relatively low, processes are simple, traditional problems that overwintering costs are high, the
survival rate of the fries is low, and qualities of the fries are poor are excellently solved, and environment-friendly and physically beneficial breeding requirements can be met.