5月的鱼苗下池进行鱼种培育,由于鱼苗体质的好坏,摄食及抗病力的强弱,从而出现生长的差异。个别鱼苗生长缓慢甚至萎缩而被淘汰,而极个别的却超出常规迅猛生长。这种生长的差异在草鱼中表现尤为明显。生产中可以发现,诸多经过严格消毒、除杂并且进出水都采取拦杂拦 May fry pond cultivation of fish species, due to the quality of fry physical, feeding and the strength of disease resistance, resulting in differences in growth. Individual fry grew slowly or even shrunken and were eliminated, while very few individuals grew more rapidly than normal. This difference in growth is particularly evident in grass carp. Production can be found that many have been strictly disinfected, impurity removal and out of water are taken to intercept