| 摘要: |
| 为探究许氏平鲉(Sebastes schlegelii)主要形态性状与体质量的相关性及在三代选育群体间的差异性，以随机采集8月龄许氏平鲉群体内选育F1代、群体内家系选育F2代和F3代为研究对象，本研究每代各选取80尾分别测量了体质量(Y, g)和11个形态性状指标(cm)：全长(X1)、体长(X2)、体高(X3)、头长(X4)、尾长(X5)、尾柄长(X6)、尾柄高(X7)、吻长(X8)、躯干长(X9)、眼径(X10)、眼后头长(X11)，采用通径分析和灰色关联度分析2种方法对许氏平鲉三代选育群体的形态性状对体质量的影响情况进行评价。结果显示，三代选育群体11个形态性状与体质量的相关关系达到极显著水平(P<0.01)或显著水平(P<0.05)。通径分析中，F1、F2代的体高和躯干长对体质量的通径系数达到极显著水平(P<0.01)；F3代的体高和尾柄长对体质量的通径系数达到极显著水平(P<0.01)。采用逐步回归方法建立了三代选育群体形态性状与体质量的多元回归方程，F1：Y=−47.383+17.097X3+ 7.308X9；F2：Y=−34.615+15.779X3+3.901X9；F3：Y=−54.496+21.966X3+7.283X6。灰色关联度分析中，三代选育群体体质量与形态性状的关联度大小及次序存在一定差异，但三代间与体质量关联度最高的前3个性状均为体高、全长和体长。研究表明，2种分析方法得到的影响体质量的主要形态性状有所不同，且在三代群体间也有所差异，但2种方法在三代选育群体中得到的第一主控性状均为体高，说明体高是影响许氏平鲉三代选育群体体质量的最主要的形态性状。本研究可为许氏平鲉选育测量指标的确定提供参考数据。 |
| 关键词: 许氏平鲉 形态性状 体质量 通径分析 灰色关联度 三代选育群体 |
| DOI： |
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| 基金项目:山东省自然科学基金(ZR2016CP21)、现代农业产业技术体系专项(CARS-47-Z14)、山东省重点研发计划项目(2017GHY15107)和山东省农业重大应用技术创新项目(2017-2020)共同资助 |
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| Phenotypic Analysis of the Main Morphological Traits and Body Weight of Black Rockfish (Sebastes schlegelii) |
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LIU Yang1,2, HAN Huizong1, WANG Tengteng1, ZHANG Mingliang1, WANG Fei1, SUN Na1,2, JIANG Haibin1
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1.Shandong Provincial Key Laboratory of Restoration for Marine Ecology, Shandong Marine Resource and Environment Research Institute, Yantai 264006;2.College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306
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| Abstract: |
| Black rockfish (Sebastes schlegelii) is an economically important marine fish. Our team constructed a three-generation breeding population of Sebastes schlegelii by combining population selection with family breeding. In order to understand the phenotypic correlation between the main morphological traits and body weight and the differences among the three-generation breeding population of S. schlegelii, the body weight (Y, g) and eleven other morphometric traits (cm), e.g., total length (X1), body length (X2), body height (X3), head length (X4), tail length (X5), caudal peduncle length (X6), caudal peduncle height (X7), tongue length (X8), trunk length (X9), eye diameter (X10), and head length behind the eyes (X11), were correlated on the three-generation continuous breeding population of 8-month-old S. schlegelii. Path analysis and gray correlation analysis were conducted to define the effect of major morphometric traits on body weight in the three-generation continuous breeding population. The results showed that all the correlation coefficients between morphometric traits and body weight achieved highly significant levels (P<0.01) or significant levels (P<0.05). The results of path analysis showed that the path coefficients between body height and trunk length were highly significant (P<0.01) in F1 and F2. The path coefficients of body height and caudal peduncle length were also highly significant (P<0.01) in F3. The multiple regression equation between the morphological traits and body weight for the three-generation breeding population were established as Y(F1)=−47.383+17.097X3+7.308X9, Y(F2)=−34.615+15.779X3+ 3.901X9, Y(F3)=−54.496+21.966X3+7.283X6. The results of gray correlation analysis showed that there was a certain difference in the size and order of the gray correlation between the body weight and morphological traits of the three-generation breeding population. However, the grey degree between body weight and body height, and the total length and body length, was the highest. The morphological traits affecting body weight were found to be different by two analytical methods, and there were obvious differences among the three-generation population. The first controlling trait was body height, indicating that body height is a predominant morphometric trait affecting body weight. This research may provide an essential reference for determining the measurement index of S. schlegelii in selective breeding. |
| Key words: Sebastes schlegelii Morphological traits Body weight Path analysis Grey relational analysis Three-generation breeding population |
