Construction and stock breeding method for cultured grass carp families

Abstract

The invention discloses a construction and stock breeding method for cultured grass carp families. The method comprises the following steps of: selecting grass carps which move actively and have high heritability and of which the weight is 15 to 20 percent more than the average weight, as parent fishes; marking cultured grass carps by using periodic interrupt timer (PIT) electronic labels, after sexual gland is matured, facilitating maturation by using hormone solution, performing artificial insemination on female and male parent fishes to obtain oosperm, performing self-hatching, then growing seedlings, breeding fishseed, breeding one-year fishes, feeding respectively, and establishing the families; from the second year to maturation time, injecting the PIT electronic label into the grass carps with the different families; performing mixed culture in a same pond, and eliminating the inferior grass carps, wherein the rest families are the basic families for next generation breeding; the young grass carps, the one-year grass carps, two-year grass carps, three-year grass carps and four-year grass carps are a critical period of family breeding; preferably choosing, and establishing the families serving as backup parent fishes; and then matching teams, raising the seedlings and then breeding continuously. A new product with high quality, high yield and stable yield is bred by establishing the different families of the cultured grass carps; and the method is used for researching the genetic characteristic and breed differentiation conditions by mating the male and female fishes among the grass carp families and inbreeding the male and female fishes in the grass carp family.

Description

technical field [0001] The invention relates to a method for breeding improved varieties of grass carp, in particular to a method for building a family of grass carp. Background technique [0002] Grass carp belongs to Cyprinidae, Cyprinidae, Yaluo subfamily, and Grass carp. It is naturally distributed in the large and medium river systems from my country's north to Heilongjiang and south to the Pearl River. Grass carp is herbivorous, has a wide range of feed sources, fast growth, and high-quality meat. It is the main target of my country's excellent traditional freshwater fishery and freshwater aquaculture, and has a history of more than 1,700 years. Especially in 1958, a breakthrough was made in artificial breeding of grass carp, which greatly promoted the development of grass carp aquaculture. In 2006, the output of grass carp was 3.963 million tons, ranking first among freshwater aquaculture fishes in the world. [0003] Grass carp is often diseased, and the three most...

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Problems solved by technology

In order to control these diseases, traditional methods such as drug treatment and vaccination have been used, but due to the limited number of types of drugs and vaccines, the traditional methods have their limitations