Tilapia fry rearing method

Abstract

The invention discloses a tilapia fry rearing method. The tilapia fry rearing method comprises the following steps: breeding parent tilapia fries which are bigger than nine-sieve, picking parent tilapias which are disease free, injury free, strong and good in sexual maturity to rear, hybridizing the female parent tilapias and with the male parent tilapias according to ratio of stocking, picking up roes, incubating the roes with flowing incubating water in an incubating tank, cultivating the roes by marking in bold, and cultivating fries. Oviposition period is shortened by about seven days, incubating rate is as high as 67.9%, fry survival rate is 89.6%, each female tilapia lays 6700 fries each year averagely, fry production rate is improved by 30%, and the sizes of the fries are uniform. By means of the tilapia fry rearing method, fries can be reared all through a year, a large amount of tilapia fries are reared and the tilapia fries grow fast and are strong in stress resistance. The tilapia fries reared in mass are born at the same time, gonad developments are synchronous, sizes are the same, characters are unified, and heredity purity is high. Moreover, the tilapia fry rearing method has the advantages that incubating period is short, incubating efficiency is high, inheritable characters are good, fertility is strong, and fries can be reared in an overwintering mode.

Description

technical field [0001] The invention relates to the technical field of fish seed production and breeding, in particular to a tilapia seed production and breeding method. Background technique [0002] Tilapia (Tilapia), commonly known as: African crucian carp, genus and species: Perciformes, Perciformes, Squididae, Tilapia belongs to a small and medium-sized fish. In today's international aquaculture industry, tilapia is a freshwater aquaculture fish cultivated by key scientific research in various countries, and is known as one of the main sources of animal protein in the future. Tilapia is native to Africa and is a tropical fish belonging to the cichlid family. It usually lives in fresh water, and can also live in salt water with different salinity content. It can survive in shallow water in lakes, rivers, and ponds. It has strong Adaptability, and has strong adaptability in water with less dissolved oxygen. [0003] As the world's natural edible fish, such as cod, and ot...

AI Technical Summary

Problems solved by technology

For example, the area of ​​tilapia cultured in Guangdong Province of my country has reached more than 800,000 mu, and the aquaculture output accounts for nearly 50% of the total output of tilapia in the country. The annual demand for improved tilapia fry exceeds 1 billion, but the current high-quality fry The supply is less than 600 million tails, which is seriously in short supply

[0007] However, in the prior art, there are still parental germplasm degeneration, decreased fecundity, irregular seed specifications and varieties, low emergence rate, and it is difficult to quickly provide a large amount of seedling supply after the beginning of winter, and how to breed fast growth and genetic traits. Stable parents and seedling water quality control and other issues