Cross—breeding of Different Geological Populations of Scallop,Chlamys farreri

Wild populations of Chlamys farreri derived from Japan and China are used as parents in a cross-breeding experiment conducted in Zhangzi Island of Liaoning Province in the early May of 2000. Four different first filial genera tions of the crossbreeding, namely JC,CJ,CC and JJ,which represent different cross combinations of the parents,are differentiated from each other in some obse rved quantitative traits including survival rate, hatchery rate and attachment rate, etc. By ANOVA analysis, significant differences in growth rate are found a mong the four populations of the offspring after one year of culturing in Shando ng Province. JJ population shows the fastest growth rate and has shell height of 46.1±0.71(SD)mm in average, whereas the other three populations,CC,CJ and JC,has the shell height of 43.1±0.42mm, 41.5±0.48mm and 37.2 ±0.31mm,resp ectively. No heterosis is detected in the experiment.