池塘驯化育鱼种具有产量高、规格大、质量好等优点,但现在有许多地方驯养育成的鱼种规格大小不一、相差悬殊。这影响养殖成鱼的规格整齐和经济效益。造成这种现象的主要原因有以下几点。一是放养的鱼苗规格不齐。放养鱼苗本身的规格不齐是造成鱼种规格不齐的主要原因之一,因为大小不一的鱼苗群体往往强弱较明显,强的不但适应快、开食早,抢食能力也强。 Domestication of pond species of fish with high yield, large size, good quality, but now there are many areas of domesticated breeding species size varies widely. This affects the tidy and cost-effective farming of fish. The main reasons for this phenomenon are the following. First, stocking specifications of fry are not homogeneous. The lack of standard specifications of the stocking of fish fry is one of the major reasons for the uneven size of the fish species. Flocks of different sizes tend to have more strength and weakness, not only adapt quickly, but also eat early and eat fast.