鱼种是淡水鱼养殖的前提条件,而大规格鱼种是提高鱼产量和成活率的重要保证,特别是北方地区,生长期相对较短,投放大规格鱼种尤其重要。现把培育大规格鱼种应注意的几个问题介绍如下:1 取大留小 及时稀放 尽量保持同池规格整齐 取大留小,可以充分利用个体大、具有生长优势 Fish species are a prerequisite for freshwater fish culture, while large species of fish species are an important guarantee for increased fish production and survival rates, especially in the northern region, where growth periods are relatively short and large-size species are particularly important. Now to cultivate large species of fish should pay attention to several issues are described below: 1 to stay big and small in time to minimize the size of the pool to keep tidy with big and small, you can take full advantage of the individual, with growth advantages