The present invention develops a marker of a genetic trait of high growth in Epinephelus fuscoguttatus to thereby provide a method whereby a fish having a genetic trait of high growth can be discriminated without killing any individuals. By using genetic markers developed with regard to Epinephelus bruneus, a genetic map of E. fuscoguttatus was prepared. Cultured E. fuscoguttatus fish were classified into a heavy-weight group and a light-weight group and then subjected to QTL analysis with use of the aforesaid genetic markers. As a result, six main genetic markers affecting the genetic trait of high growth were found out, said genetic markers being Ebr00010FRA (SEQ ID NO: 1) and Ebr00935FRA (SEQ ID NO: 2) which are DNA marker loci on linkage group 12 and Ebr00846FRA (SEQ ID NO: 3), Ebr00924FRA (SEQ ID NO: 4), CfuSTR210 (SEQ ID NO: 5) and Ebr01255FRA (SEQ ID NO: 6) which are DNA marker loci on linkage group 21.本發明提供一種開發出老虎斑之高成長性標記，不殺死個體而可辨別具有高成長性之性狀之魚的方法。利用針對褐帶石斑魚開發出之遺傳標記，製作老虎斑之遺傳圖，針對養殖老虎斑之體重較大之群及較小之群，對上述遺傳標記進行QTL分析，結果發現對成長性遺傳性狀造成影響之6個主要之遺傳標記(連鎖群12上之DNA標記座Ebr00010FRA(序列編號1)及Ebr00935FRA(序列編號2)、以及連鎖群21上之DNA標記座Ebr00846FRA(序列編號3)、Ebr00924FRA(序列編號4)、CfuSTR210(序列編號5)及Ebr01255FRA(序列編號6))。
