我们在扬中市水产技术研究所经多年试验，掌握了一套分级培育长吻鱼苗的新技术，可大大提高鱼苗培育的成活率，现总结如下：一、苗种培育前的准备１．池塘的选择池塘为东西向的长方形，光照充足，引用长江水，面积０．５～３亩不等，深１．５米，池底较平坦，有适量的底泥，无? After years of experimentation, we have mastered a set of new technologies for grading long-half-finger fry in Yangzhong Aquatic Technology Research Institute, which can greatly improve the survival rate of fry breeding. The results are summarized as follows: 1. Preparation before seed breeding 1. Pond pond selection for the east-west rectangle, adequate light, citing the Yangtze River water, an area of ​​0.5 to 3 acres ranging from 1.5 meters deep, the bottom of the pool is relatively flat, there is the right amount of sediment, without?