Partial nucleotide sequences of mitochondrial DNA control region fragment were sequenced and analyzed to estimate genetic differentiations between cultured (F1 and F2) and wild rock bream (Oplegnathus fasciatus) populations. The result showed that the haplotype diversity of cultured population (F1) (h = 0.955±0.047) was just a little below that of wild population (h = 1.000±0.034), but which was significantly higher than that of F2 (h = 0.797±0.070) based on the length of 484bp sequence. Significant decline trend of nucleotide diversity was detected from wild population (π= 0.021± 0.012) to cultured population F1 (π= 0.018±0.010) and F2 (π= 0.014±0.008), the same results were also checked in the Mismatch analysis and average number of nucleotide differences analysis in the present study. Significant population genetic differentiations were detected between cultured population (F1 and F2) and wild population based on the analyses of AMOVA, conventional φST and the exact test. No significant genealogical structure corresponding to the cultured and wild populations was detected in the species based on the MST and NJ analyses.%采用线粒体(mtDNA)控制区序列分析方法,进行了条石鲷养殖群体(F1代和F2代)与野生群体的遗传变异比较研究.结果表明:在长度为484bp的mtDNA控制区片段中,条石鲷养殖群体F1代单倍型多样度水平(h=0.955±0.047)略低于野生群体(h=1.000±0.034),却显著高于养殖F2代群体(h=0.797±0.070);条石鲷野生群体(π=0.021±0.012)、养殖群体F1代(π=0.018士0.010)和养殖群体F2代(π=0.014±0.008)的核苷酸多样度水平呈现明显的递减趋势；核苷酸不配对分布和两两序列相比较碱基差异结果显示条石鲷野生群体、养殖群体F1代和养殖群体F2代也呈现明显的递减趋势.分子方差分析(AMOVA)、两两群体相比较的ΦsT和确切P检验结果皆显示条石鲷养殖群体F1代和F2代与野生群体存在显著的遗传分化.单倍型最小跨度分析和NJ系统分析结果均未检测到显著的谱系结构.
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