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Genetic analysis on morphological attributes in Paralichthys olivaceus different families

LIU Yongxin1,LIU Haijin2(1.College of Animal Science and Technology,Northeast Agricultural University,Harbin 150030,China; 2.Chinese Academy of Fishery Sciences,Beijing 100039,China)  
Correlation analysis and principal components analysis were made with seven morphological attributes including total length(TL),body length(BL),head length(HL),caudal peduncle length(CPL),post-ortital length(PL),body depth(BD) and caudal peduncle depth(CPD) according to measure growth data of eleven families offspring at different test-day.Variance analysis of TL,absolute growth ratio,growth index and body shape index were conducted and growth equations of seven traits were established.The results showed that the high positive phenotypic correlations were observed among seven morphological attributes in which the contribution rate of TL was the highest.The family I33I03,I08I09 and GBI09 had significant predominant in terms of TL,but family I08I09 performed well on absolute growth ratio and growth index,which suggested that an intensive selection was needed for these families.In the result of body shape index analysis,family C64I03 and I19I03,I32I03 performed well on TL/BD and CPL/CPD,respectively.The three families would be the important objectives for selection of Japanese flounder better shape.Seven morphological attributes were fitted by logistic growth equation in which the fitness of growth pattern for five traits attain to above 0.93.
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