Correlation and path analyses on morphometric traits and body mass of F<sub>5</sub> generation breeding population in sea cucumber (<i>Apostichopus japonicus</i>)

doi:10.3785/j.issn.1008-9209.2021.11.021

Journal of Zhejiang University (Agriculture and Life Sciences)

2022, Vol. 48

Issue (5): 653-659 DOI: 10.3785/j.issn.1008-9209.2021.11.021

Animal sciences & veterinary medicines

Correlation and path analyses on morphometric traits and body mass of F₅ generation breeding population in sea cucumber (Apostichopus japonicus)

Sha HAN¹(

),Wei HU¹,Chenglin LI¹(

),Wenwen LI²,Bin ZHAO¹,Hongxia QU³,Qi WANG¹,Linlin YAO¹

^1.Marine Science Institute of Shandong Province, Qingdao 266104, Shandong, China
^2.Fisheries Technical Service Center of Laiyang City, Yantai 265200, Shandong, China
^3.Extension Station of Fishery Technology of Rushan City, Weihai 264500, Shandong, China

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Abstract

In order to explore the relationships between morphometric traits and body mass (BM) of sea cucumber (Apostichopus japonicus), correlation analysis and path analysis were used to obtain the main morphometric traits affecting body mass. Three morphometric traits including body length (BL), body width (BW) and body mass of 366 individuals of F₅ generation breeding population at one year old were measured, and one compound index that combined body length and body width to produce the square root of the length-width (SLW) index was calculated. The results showed that the correlation coefficients between morphometric traits and body mass were highly significant. The stepwise regression analysis showed that morphometric traits (SLW and body width) and body mass were significantly positive correlations (P＜0.001). Based on path coefficients, the multiple linear regression mode equation on the effects of body mass was established as BM=－16.14+6.70SLW+4.31BW. The morphometric traits that directly affected body mass were SLW＞BW, and SLW was the main morphometric trait that significantly affected body mass and its path coefficient was 0.62. Body width had an indirect effect on the body mass via SLW. The fitting relationships between morphometric traits and body mass were expressed as following BM=0.39SLW^2.66 (R²=0.86, P＜0.001), showing negativeallometry tendency. The results provide valuable information and theoretical guidance for A. japonicus breeding programs. Body width should be selected directly and body length simultaneously, when body mass is the breeding target.

Key words： Apostichopus japonicus body mass morphometric traits growth traits path analysis

Received: 02 November 2021 Published: 02 November 2022

CLC:

S 917.4

Corresponding Authors: Chenglin LI E-mail: shahan_2012@163.com;lcl_xh@hotmail.com

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	Sha HAN
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	Hongxia QU
	Qi WANG
	Linlin YAO

Cite this article:

Sha HAN,Wei HU,Chenglin LI,Wenwen LI,Bin ZHAO,Hongxia QU,Qi WANG,Linlin YAO. Correlation and path analyses on morphometric traits and body mass of F₅ generation breeding population in sea cucumber (Apostichopus japonicus). Journal of Zhejiang University (Agriculture and Life Sciences), 2022, 48(5): 653-659.

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https://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2021.11.021 OR https://www.zjujournals.com/agr/Y2022/V48/I5/653

刺参选育群体F₅代形态性状与体质量相关性及通径分析

为研究刺参选育群体体长（body length, BL）、体宽（body width, BW）等形态性状对体质量（body mass, BM）的影响，随机选取刺参选育群体F₅代个体366头（一龄），对刺参体长、体宽、体质量3个性状指标及1个复合形态指标长宽平方根（square root of the length-width, SLW）进行相关性分析和通径分析。结果显示：性状之间的相关系数均达到显著水平。逐步回归分析表明，体宽、SLW与体质量间的回归关系达到极显著水平（P＜0.001），因此建立以体宽和SLW为自变量的最优回归方程BM=－16.14+6.70SLW+4.31BW；形态性状对体质量的直接影响为SLW＞BW，SLW是影响刺参体质量的主要因素，其通径系数为0.62，体宽主要通过SLW对体质量实现间接作用；从拟合形态性状与体质量的关系可知，最优幂函数方程为BM=0.39SLW^2.66（R²=0.86，P＜0.001），表明该生长阶段为负异速生长模式，形态性状生长明显快于体质量增加。因此，在刺参的选育过程中，当以体质量为选育目标时，应把体宽作为直接选择，同时加强对体长的协同选择。

关键词： 刺参, 体质量, 形态性状, 生长性状, 通径分析

Table 1 Descriptive statistical results of traits of A. japonicus

Table 2 Correlation coefficients between morphometric traits and body mass of A. japonicus

Table 3 Path coefficients of morphometric traits on body mass of A. japonicus

Table 4 Determination coefficients of morphometric traits on body mass of A. japonicus

Table 5 Output results of multiple regression models of morphometric traits to body mass in A. japonicus

Table 6 Output results of multiple regression coefficients of morphometric traits to body mass in A. japonicus

Fig. 1 Relationship between SLW and body mass of A. japonicus

Fig. 2 Relationship between body width and body mass of A. japonicus

Fig. 3 Relationship between body length and body width of A. japonicus


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