Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2022, Vol. 38 ›› Issue (35): 141-147.doi: 10.11924/j.issn.1000-6850.casb2021-0988

Special Issue: 生物技术 水产渔业

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Path Analysis of Morphological Trait Effects on Body Weight of Low-salinity Population of Exopalaemon carinicauda

ZHANG Nianguo1(), ZHOU Yuhua1, PAN Guiping1, ZHOU Wenyu1, HOU Wenjie1, LIU Benwei1, YU Fei2()   

  1. 1Shanghai Fisheries Research Institute, Shanghai Fisheries Technical Extension Station, Shanghai 200433
    2Lianyungang Marine and Fisheries Development Promotion Center, Lianyungang, Jiangsu 222003
  • Received:2021-10-19 Revised:2022-04-14 Online:2022-12-15 Published:2022-12-09
  • Contact: YU Fei E-mail:z817382@126.com;yufei6@126.com

Abstract:

In order to study the effects of morphological traits on body weight of low-salinity population of Exopalaemon carinicauda, 100 samples, including 40 egg-carrying individuals and 60 normal individuals, were randomly selected from Fengxian of Shanghai and their weight (Y), body length (X1), cephalothorax length (X2), cephalothorax width (X3), cephalothorax height (X4), first abdominal segment height (X5), first abdominal segment width (X6), abdomen length (X7), length of upper frontal eminence (X8), and telson length (X9) were measured. Correlation analysis, path analysis and regression analysis were used to analyze the effects of morphological traits on body weight of parents of low-salinity population, and the multiple regression equations were constructed. The results showed that there was no significant variation (P>0.05) in the morphological traits except body weight, and morphological traits of egg-carrying parents were higher than those of non-egg carrying parents, the correlation of each morphological trait to body weight all reached an extremely significant level (P<0.01). According to path analysis, the main morphological traits such as cephalothorax length, cephalothorax width and telson length in egg-carrying individuals of low-salinity population had a predominantly direct effect on body weight, reaching a significant level (P<0.01), and the maximal effect was achieved by telson length (0.900). The direct effect of main traits on body weight reached significant or extremely significant levels in non-eggcarrying parents, and cephalothorax length had the maximal effect (0.747).The stepwise regression analysis indicated that the optimal linear regression equation of the effects on body weight was Y=-5.480+0.583X2-0.838X3+5.756X9 in egg-carrying individuals and Y=-5.870+0.203X1+1.314 X2+2.532 X4+2.820 X6-1.001 X8 in non-egg carrying individuals respectively, and the two regression equations between body weight and morphological traits were expressed at a very significant level (P<0.01) by means of variance analysis and partial regression coefficient test. The finding of this study provides theoretical reference and measurement indexes for selective breeding of E. carinicauda of low-salinity population.

Key words: Exopalaemon carinicauda, parent, morphological trait, body weight, path analysis

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