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Genetic parameter estimates for female proportion in tongue sole (Cynoglossus semilaevis)

文献类型： 外文期刊

作者： Li, Yangzhen 1 ; Hu, Yuanri 1 ; Yang, Yingming 1 ; Cheng, Jiayu 4 ; Cheng, Xiangming 4 ; Chen, Songlin 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Shandong Key Lab Marine Fisheries Biotechnol & Ge, Qingdao 266071, Peoples R China

2.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Marine Fisheries Sci & Food Prod Proc, Qingdao 266237, Peoples R China

3.Shanghai Ocean Univ, Natl Demonstrat Ctr Expt Fisheries Sci Educ, Shanghai 201306, Peoples R China

4.Tangshan Weizhuo Aquaculture Co Ltd, Engn & Technol Ctr Flatfish Aquaculture Tangshan, Tangshan 063202, Peoples R China

关键词： Female proportion; Growth; Heritability; Genetic correlation; Cynoglossus semilaevis

期刊名称：AQUACULTURE （ 影响因子：5.135； 五年影响因子：5.125 ）

ISSN： 0044-8486

年卷期： 2022 年 548 卷

页码：

收录情况： SCI

摘要： Tongue sole is an economically important marine flatfish with significant sexual growth dimorphism that female with superior growth performance, and phenotypic female proportion (FP) is rather low (10%-30%) under rearing conditions. Knowledge of whether genetic variation exists for FP is needed for determining the feasibility of including this desirable trait into breeding goal in tongue sole. The aims of this study were to estimate the heritability of FP and genetic correlations between FP and growth traits (body weight, BW; total length, TL) by using a population of 16,240 individuals from 157 full-sib families (involving four year-classes (YCs), three consecutive pedigreed generations). At juvenile stage, fish from each family were random sampled to measure BW and TL, and then sexed by examining gonad tissues under microscope. The overall FP was 43.8% across all year-classes, and family FP ranges from 25.4% to 69.9%. Across YCs, there was a low but significant genetic variation for FP with heritability estimates of 0.02 +/- 0.00 (observed scale) and 0.03 +/- 0.01 (underlying scale). Within YC, heritability estimates varied from 0.00 +/- 0.00 to 0.08 +/- 0.01 on observed scale, and from 0.00 +/- 0.00 to 0.04 +/- 0.01 on underlying scale. Genetic correlations between FP and BW, and between FP and TL were both of moderately positive magnitude, which were 0.46 +/- 0.09 and 0.39 +/- 0.10 respectively, and significantly different from zero (P < 0.05). These results confirm the existence of genetic variation for FP and demonstrate the feasibility of joint improvement of FP and growth traits through selective breeding.

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