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随机选取56尾放养于稻田生境的泥鳅(Misgurnus anguillicaudatus)1年龄同生群个体作为研究对象,分别测量其体质量(BW)、净体质量(NW)、全长(X_1)、体长(X_2)、肛长(X_3)、肛后长(X_4)、肛围(X_5)、肛部体高(X_6)、肛部体宽(X_7)、头长(X_8)、头高(X_9)、头宽(X_(10))、眼间距(X_(11))、鼻间距(X_(12))、躯干长(X_(13))、体高(X_(14))、体宽(X_(15))、尾柄长(X_(16))、尾柄高(X_(17))、背鳍部周长(X_(18))、背鳍部体高(X_(19))、吻长(X_(20))、背前区长(X_(21))等23项性状,采用相关分析、通径分析和多元回归分析方法研究了泥鳅各项形态性状对体质量、净体质量的影响效应。结果表明:(1)各性状与体质量、净体质量间的相关系数均达到极显著水平(P<0.01);(2)经通径分析,全长(X_1)、背鳍部周长(X_(18))、肛长(X_3)和肛部体宽(X_7)等4项被保留的性状对体质量、净体质量相关指数分别为0.947和0.948,其中全长(X_1)对体质量和净体质量直接作用最大,分别为0.341和0.348,肛长(X_3)对体质量和净体质量间接作用最大,分别为0.636和0.637;(3)经多元回归分析,建立用于估计泥鳅个体体质量、净体质量的最优方程分别为BW=0.083X_1+0.175X_(18)+0.098X_3+0.540X_7-18.562和NW=0.084X_1+0.177X_(18)+0.098X_3+0.500X_7-19.607
Sixty - four individuals of Misgurnus anguillicaudatus, a group of Misgurnus anguillicaudatus, were selected randomly to study their body weight (BW), net body mass (NW), total length (X_1) and body length (X_2 ), Anal length (X_4), anal length (X_4), anal periphery (X_5), anal height (X_6), anal body width (X_7), head length (X_8), head height (X_ (10)), ocular distance (X_ (11)), nasal distance (X_ (12)), trunk length (X_ (13) , Tail length (X_ (16)), caudal height (X_ (17)), dorsal fin length (X_ (18)), dorsal fin height (X_ (19) (X 21) and other 23 traits. The correlation analysis, path analysis and multivariate regression analysis were used to study the effect of various morphological traits of Loach on body weight and net body mass. The results showed that: (1) The correlation coefficient between each trait and body mass and net body mass reached the extremely significant level (P <0.01); (2) Through the path analysis, the total length (X_1) (18), the anal length (X_3) and the body width of the anus (X_7) were 0.947 and 0.948, respectively, of which the total length (X_1) The net body mass had the most direct effect, which was 0.341 and 0.348 respectively, and the indirect effect of body length and body weight was the largest (0.636 and 0.637, respectively). (3) The multiple regression analysis The optimal equations of mass and net body mass are BW = 0.083X_1 + 0.175X_ (18) + 0.098X_3 + 0.540X_7-18.562 and NW = 0.084X_1 + 0.177X_ (18) + 0.098X_3 + 0.500X_7-19.607