Method for improving overwintering survival rate and qualities of oreochromis niloticus fries

Abstract

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.

Description

technical field

[0001] The invention belongs to aquaculture seed cultivation technology, in particular to a set of cultivation methods capable of improving the overwintering survival rate and quality of gifu tilapia seedlings. Background technique

[0002] Among the freshwater aquaculture products in Guangdong, the aquaculture output of tilapia accounts for about 40%, which is much higher than that of the four major domestic carp, snakehead, and crucian carp. The cultured species of tilapia are mainly Gifu tilapia and Oni hybrid tilapia, of which Gifu tilapia accounts for 2 / 3 of the products. Gifu tilapia has the advantages of fast growth, strong stress resistance and high meat yield, and is very popular among farmers.

[0003] Guangdong has a subtropical climate, with temperatures above 18°C ​​for nearly nine months each year (from March to November), which is very suitable for tilapia farming. However, the breeding temperature of tilapia needs to be above 22°C, which...