The genetic diversity of reared populations of bay scallop Argopecten irradians(Lamarck)

The genetic diversity of four reared populations(Dalijiadipai DLJD,Dalijiagaopai DLJG,Lingshuiqiao LSQ,Qipanmo QPM) of bay scallop Argopecten irradians(Lamarck) at the coastal shellfish farms in Dalian had been investigated based on polyacrylamide gel electrophoresis for allozyme.22 loci in 7 enzymes and general protein were detected.Based on the 22 common loci of samples in four populations,the proportion of polymorphic loci was 22.73%,22.73%,22.73% and 18.18% respectively under the criterion P≤0.95 and 27.27%,27.27%,31.82% and 36.36% respectively under the criterion P≤0.99; the mean heterozygosity observed was 0.064,0.071,0.075 and 0.069 respectively; the deviation index from Hardy-Weinberg equilibrium was-0.068,-0.020,-0.032 and-0.050 respectively; inbreeding coefficient was 0.568,0.565,0.487 and 0.550 respectively; the mean effective number of allele in a locus was 1.102,1.109,1.143 and 1.122 respectively; the comprehensive index of genetic variation was 0.006 0,0.007 1,0.008 8 and 0.007 3 respectively.The genetic diversity of the bay scallop was lower than the average of bivalve.The genetic diversity in LSQ was the highest,in DLJG and QPM was higher,in DLJD was the lowest among the four populations.