Three-line cross breeding method for macrobrachium nipponensis

The invention relates to the technical field of aquaculture genetic breeding, in particular to a three-line cross breeding method for macrobrachium nipponensis. Comprising the steps of collecting, isolating and breeding local wild excellent populations, breeding the populations, selecting backup parents as foundation populations, producing intermediate transition hybrid line populations through two-site hybridization, producing improved hybrid line production populations through three-line hybridization and the like. The breeding method disclosed by the invention has remarkable heterosis on improving locally-cultured macrobrachium nipponensis groups; compared with local shrimp seeds, the shrimp seeds bred through the breeding method have remarkable progress in the aspects of growth speed, disease resistance, stress resistance, physical characteristics and the like, the individual quality, breeding yield and large-size commercial shrimp proportion of bred shrimps are remarkably improved no matter the shrimp se