Crossbreeding of chlamys farreri were performed using the parent scallops from the korea wild population ( k ) , china cultured stock ( c ) and the survived individuals in epedimic waters in culture area of china ( cs ) . four crosses , k k , k c , k cs and c c , were constructed . the index of growth performance of their progenies such as the length and width of the shell and the individual weight were measured for heterosis study 用来自韩国野生的栉孔扇贝和中国养殖的栉孔扇贝以及发病区存活的个体作为亲本，构建韩国野生韩国野生、韩国野生中国养殖、韩国野生中国养殖发病区存活个体以及中国养殖中国养殖共四个交配组合，通过对f1代个体壳宽、壳高和体重的测量比较不同群体的生长情况。
Compared with the 5 . 8s complete sequence of the snail arion rufus , its1 and its2 regions were recognized and combined for analysis . from sequence observation , it showed that the zhejiang sample has more inserted sites and fragments while the sequences of other three are nearly all the same . the average g % + c % of the four individuals was 46 . 8 % while the zhejiang sample ' s was 48 . 3 % and the other three ' s were all about 46 . 2 % ; ts / tv and genetic distance mainly lies between the zhejiang sample and the other three individuals , which were 0 . 8 and 0 . 07 respectively 用于比较的序列长约350bp ，观测一级结构，加拿大、墨西哥湾扇贝和美国二代个体的its1和its2序列几乎完全相同，而浙江个体则具有较多的插入位点与片段； 4个个体平均g + c含量46 . 8 % ,其中浙江个体为48 . 3 % ，其它3个个体均为46 . 2 %左右；转换颠换比与遗传距离主要存在于浙江个体与其它3个个体之间，分别为0 . 8和0 . 07左右；以栉孔扇贝作外群构建的分子系统树表明：浙江群体已产生了一定的分化。
