红鳍东方鲀生长性状的遗传力估计及性状间相关关系的初步研究

为估计红鳍东方鲀Takifugu rubripes生长性状的遗传力及生长性状间的相关关系,构建了5个全同胞家系,测定了210日龄(504尾)和360日龄(500尾)红鳍东方鲀的体质量、体长和体全长等生长性状的表型值,构建固定模型,用全同胞法估计了210日龄和360日龄红鳍东方鲀的体质量、体长和体全长3个生长性状的遗传力。结果表明:红鳍东方鲀的体质量、体长和体全长3个生长性状的遗传力估计值在210日龄时分别为0.54、0.38、0.52,在360日龄时分别为0.46、0.37、0.44,这3个性状的遗传力属于中等和高等遗传力;体质量与体长,体质量与体全长,以及体长与体全长的遗传相关系数在210日龄时分别为0.99、0.99、0.98,在360日龄时分别为0.97、0.97、0.96,这3个性状之间的遗传相关呈高度正相关;测定了102日龄(296尾)红鳍东方鲀的体质量、体长和体高3个生长性状,利用回归模型建立了体质量(W)与体长(L)和体全高(H)的数学模型为W=e-8.513L2.046H0.742(R2=0.903)。本研究结果可为红鳍东方鲀的遗传育种研究提供参考。

Heritability estimating and correlativity of growth traits in redfin puffer Takifugu rubripes

The phenotypic values of growth traits including body weight, body length and total body length were measured in 504 individuals (210 days old) and 500 individuals (360 days old) of redfin puffer Takifugu rubripes from five full-sib families to estimate the heritability and correlativity of growth traits in the redfin puffer. The re-sults showed that the heritability of 210 days old individuals was 0. 54 in body weight, 0. 38 in body length, and 0. 52 in total body length and the heritability of 360 days old fish 0. 46 in body weight, 0. 37 in body length, and 0. 44 in total body length, the heritability of these three traits within secondary and higher heritability. There was the genetic correlation of 0. 99 between body weight and body length, 0. 99 between body weight and total body length, and 0. 98 between body length and total body length in 210 days old redfin puffer. In the 360 days old fish, the genetic correlation was found to be 0. 97 between body weight and body length, 0. 97 between body weight and total body length, and 0. 96 between body length and total body length, with highly positive genetic correlations. The regression analysis of phenotypic values of growth traits including body weight, body length and body height from 296 samples of 102 days old redfin puffer revealed that the mathematical model of growth traits ( body weight, W;body length, L and body height, H):W=e-8.513L2.046H0.742(R2=0. 903). The findings provide an important foundation for breeding of redfin puffer.