Analysis of phenotypic and genetic parameters for growthrelated traits in the half smooth tongue sole, <i>Cynoglossus semilaevis</i> -- Journal of Oceanology and Limnology,2016,34(1):163-169

	Cite this paper:
	LIU Feng, LI Yangzhen, DU Min, SHAO Changwei, CHEN Songlin. Analysis of phenotypic and genetic parameters for growthrelated traits in the half smooth tongue sole, Cynoglossus semilaevis[J]. Journal of Oceanology and Limnology, 2016, 34(1): 163-169

Analysis of phenotypic and genetic parameters for growthrelated traits in the half smooth tongue sole, Cynoglossus semilaevis

LIU Feng^1,2,4, LI Yangzhen¹, DU Min^1,3, SHAO Changwei¹, CHEN Songlin¹

1 Key Lab for Sustainable Development of Marine Fisheries, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China;
2 College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China;
3 Key Lab for Quality, Efficient Cultivation and Security Control of Crops in Colleges and University of Yunnan Province, Honghe University, Yunnan 661199, China;
4 Marine and Fishery Research Institute of Zhejiang Ocean University, Marine Fisheries Research Institute of Zhejiang, Zhoushan 316022, China

Abstract:

Phenotypic and genetic parameters for growth-related traits in the half-smooth tongue sole, Cynoglossus semilaevis, were estimated in 22 full-sib families produced by normal and neo-male breeding stocks. As phenotypic males with female genotypes, neo-males are harmful in C. semilaevis aquaculture because they reduce overall production. The present study evaluated the diff erence in the growth-related traits: total length (TL), body weight (BW) and square root of body weight (SQ_BW) at the age of 570 days between normal and neo-male off spring (neo-males used as male parents). The diff erence in the proportion of females between normal and neo-male off spring was also assessed. Based on the linear mixed model, restricted maximum likelihood (REML) and best linear unbiased prediction (BLUP) were used to estimate various (co)variance components and estimated breeding values (EBVs) of growth-related traits. As a result, all the mean values of the three studied traits were signifi cantly larger in normal off spring than in neo-male off spring. Additionally, the female proportion was signifi cantly larger in normal off spring than in neo-male off spring. Heritability was 0.128±0.066 2 for TL, 0.128±0.065 5 for BW and 0.132±0.062 9 for SQ_BW, all of which were low level heritabilities. The correlation coeffi cients of EBVs and phenotypic values of the target traits were 0.516 for TL, 0.524 for BW and 0.506 for SQ_BW, all of which were highly signifi cant ( P < 0.01). Genetic correlations among TL, BW and SQ_BW were positive high (0.921-0.969) and higher than those of phenotype (0.711-0.748), both of which had low standard errors (0.063-0.123 for genotype, and 0.010-0.018 for phenotype). Compared with normal off spring, neo-male off spring have lower breeding values for each studied trait through EBVs comparison. Therefore, neo-male off spring should not be used as broodstock in a C. semilaevis breeding programs.

Key words: Cynoglossus semilaevis|estimated breeding value (EBV)|heritability|genetic correlation

Received: 2015-02-07 Revised: 2015-03-10

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Articles by LIU Feng

Articles by LI Yangzhen

Articles by DU Min

Articles by SHAO Changwei

Articles by CHEN Songlin

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