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1.分别选不同区域或水系的后备亲鱼。池塘和水库中放养的青鱼、草鱼、鲢鱼、鳙鱼,一般都是人工繁殖的种苗。为防止近亲繁殖,防止退化,应尽可能选择不同水体中或不同水系中血缘关系较远的雌雄亲鱼进行交配。选用后备亲鱼时,要从不同区域或水系中选择有优良遗传性状的品系和个体。2.互相交换不同亲缘系统的雄鱼或精液。可以在两个临近的亲鱼来源不同的繁殖场,同时交换雄鱼或精液。采集精液的雄
1. Choose different regions or water reserve broodstock. Ponds and reservoirs stocked herring, grass carp, silver carp, bighead carp, are generally artificial breeding seedlings. In order to prevent inbreeding and prevent degeneration, we should try our best to mate male and female relatives in different water bodies or different water systems. When using reserve broodstock, select from different regions or water systems have good genetic traits strains and individuals. 2. Exchange male or female semen of different relatives with each other. The males or semen can be exchanged at the same time on two different broodstock from different broodstock. Semen collected male