Method for breeding blue crab families

Abstract

A method for breeding blue crab families comprises the following steps: S1, collecting blue crabs bred in different populations of China to construct base groups, and conducting genetic diversity comprehensive evaluation, S2, respectively selecting parent crabs from the different populations, establishing the families according to the complete diallel cross mode to grow larvae and breed in a standardizing mode, and calculating hybrid heterosis rates, S3, utilizing the crabs with outstanding hybrid heterosis to mate and combine, constructing the families through indoor artificial directional mating to grow the larvae and breed in the standardizing mode, and twice screening stocking families, S3, over-wintering mated female crabs of parent groups bred indoors of the stocking families, S4, selecting the parent crabs with high egg-laying rates from each family in following spring to grow the larvae and breed in the standardizing mode, and utilizing the breeding method to continue to screen the families. By means of the method for breeding the blue crab families, the growth rate and the survival rate of the blue crabs are used as indexes, blue crab families breeding is conducted, family economic characters are comprehensively evaluated, according to breeding results, blue crab norms are improved in the harvesting process, the breeding survival rate is improved, so that breeding benefits are greatly increased, and deviation caused by single character breeding is avoided.

Description

technical field [0001] The invention belongs to the field of aquatic breeding, and in particular relates to a method for breeding Portunus trituberculatus families. Background technique [0002] Portunus trituberculatus is an important marine economic animal, with a current breeding area of ​​500,000 mu and an output of 100,000 tons. It has become one of the leading species of marine farming in my country. At present, the aquaculture industry of Portunus trituberculatus mainly relies on catching wild crabs to meet the needs of production and breeding, which limits its development. On the one hand, these caught wild Portunus trituberculatus may carry infectious viruses, resulting in a very low survival rate (5-10%), causing heavy losses to the development of industries and regional economies; on the other hand, growth rate is an important economic factor. traits, the economic value of large-scale Portunus trituberculatus is obviously higher. Therefore, cultivating good vari...

AI Technical Summary

Problems solved by technology

Traditional group breeding cannot take into account the two traits of growth rate and survival rate. Since swimming crabs do not have suitable individual markers, they cannot be selected by evaluating individual breeding values.

According to the characteristics of the species and the current research progress, the breeding method of the family is better, but because the individual markers have not been resolved, the family cannot be mixed, and must be cultured separately in different grids or ponds. During the breeding process, the density is one. The dynamic change value, and the breeding density has a great influence on the growth rate, so the growth rate is used as a single breeding index, and the result is unscientific; if the survival rate is used as a single breeding index, the result may lead to the selection of finished crabs with small size and economical low value

Therefore, family selection based on a single trait as a breeding index may result in poor breeding effects or low economic benefits

At present, there is no relevant report on the breeding of Portunus trituberculatus growth rate and survival rate compound traits at home and abroad

In addition, when portunus in northern my country are cultured to 120 days of age, the female crabs complete reproductive molting and mating, and are harvested and marketed at 180 days of age. Due to the asynchronous timing of mating and harvesting, it brings great benefits to the construction of family lines and the accurate evaluation of growth traits. great difficulty