不同生长期圆斑星鲽形态性状对体重影响的通径分析

Path analysis of effects of morphometric traits on body weight in spotted halibut Verasper variegatus at different growth stages

圆斑星鲽(Verasper variegatus)作为中国鲽形目(Pleuronectiformes)养殖鱼类的重要代表种类,具有生长速度快,可食用部分多,肉质细嫩等特点。为了探究圆斑星鲽形态性状与体重的关系,本研究分别测定11月龄、14月龄和17月龄3个不同生长期圆斑星鲽的体重及全长(FL)、体长(BL)、体高(BH)、头长(HL)、头高(HH)、尾柄长(CL)、尾柄高(CH)、吻长(SL)共计8个形态性状,分别进行相关分析和通径分析,剖析形态性状对于体重的直接作用和间接作用;利用回归分析的方法,建立各个时期以形态指标为自变量,体重为因变量的最优线性回归方程。结果显示,1)不同生长阶段,影响体重的重点形态指标存在差异,影响11月龄圆斑星鲽体重的主要形态性状为体高和体长,14月龄阶段为全长、体高和头长,17月龄阶段为全长和体高;2)11月龄、14月龄和17月龄形态性状对体重(Y)的多元回归方程分别为:Y=-186.412+17.381XBH+10.517XBL,Y=-362.484+13.145XFL+20.172XBH+21.199XHL,Y=-816.147+24.121XFL+40.575XBH;3)除本研究所包括的形态指标外,体厚可能为另外一个影响圆斑星鲽体重的重要指标。本研究阐明了体重与形态指标间的相关关系,为圆斑星鲽的良种选育提供了生物学依据。

Verasper variegatus is an important representative species of the Pleuronectiformes.It has a fast growth rate,most parts of its body are edible,and the meat is tender and delicious;all these features make V.variegatus a good aquaculture candidate.In order to explore the relationship between morphometric traits and body weight in V.variegatus,full length(FL),body length(BL),body height(BH),head length(HL),head height(HH),caudal peduncle length(CL),caudal peduncle height(CH),snout length(SL),and body weight(BW)of V.variegatus at11,14,and17months of age were measured.Correlation and path analysis were conducted,and the effects of each morphometric trait on body weight were separated into direct and indirect effects.Regression analyses were conducted with morphological traits as independent variables and body weight as the dependent variable at each growth stage.The results showed that(1)different morphometric traits had significant path coefficients at each growth stage;at the11month stage,the morphometric traits that significantly affected body weight were BH and BL,at the14month stage,the significant morphometric traits were FL,BH,and HL,at the17month stage,the significant traits were FL and BH.(2)The regression equations at11,14,and17months of age were Y=-186.412+17.381XBH+10.517XBL,Y=-362.484+13.145XFL+20.172XBH+21.199XHL,and Y=-816.147+24.121XFL+40.575XBH,respectively.(3)Besides the morphometric traits included in this study,body thickness is another potentially important trait that can affect body weight.This study demonstrated the relationship between morphometric traits and body weight.The results provide valuable information and theoretical guidance for V.variegates breeding programs.