Mass Selection for Growth Improvement in Black Shell Line of Pacific Oyster Crassostrea gigas  

作　　者：XU Chengxun LI Qi CHONG Jindou LIU Shikai KONG Lingfeng 

机构地区：[1]Key Laboratory of Mariculture of Ministry of Education,Ocean University of China,Qingdao 266003,China [2]Laboratory for Marine Fisheries Science and Food Production Processes,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China

出　　处：《Journal of Ocean University of China》2019年第6期1411-1416,共6页中国海洋大学学报（英文版）

基　　金：supported by the grants from the National Natural Science Foundation of China (Nos. 3177 2843, 31741122);the Earmarked Fund for Agriculture Seed Improvement Project of Shandong Province (No. 2017LZGC009);the Fundamental Research Funds for the Central Universities (No. 201762014)

摘　　要：The Pacific oyster,Crassostrea gigas,naturally distributing along the coast of northwest Pacific,is one of the most important bivalve species due to its high economic value and fecundity.In China,we have initiated a selective breeding program on both shell color and growth rate of C.gigas since 2010.A black shell line was obtained through four-generation family selection.In this study,mass selection for growth improvement was conducted in the sixth generation and seventh generation of black shell lines.To assess the progress of potential genetic improvement,the progeny of two generations of black shell lines were selected to evaluate their shell heights via a 450-day farming experiment.As the results,after growing for 450 days,the sixth generation and seventh generation of selected lines were 9.03% and 11.42% larger than the control lines,respectively.During the grow-out stage,the genetic gain of two generations was 8.82%±0.18% and 11.54%±0.43%,respectively;and the corresponding realized heritability was 0.45±0.04 and 0.41±0.04,respectively.These results indicated that the mass selection for shell height achieved steady progress in the two generations of C.gigas.The Pacific oyster, Crassostrea gigas, naturally distributing along the coast of northwest Pacific, is one of the most important bivalve species due to its high economic value and fecundity. In China, we have initiated a selective breeding program on both shell color and growth rate of C. gigas since 2010. A black shell line was obtained through four-generation family selection. In this study, mass selection for growth improvement was conducted in the sixth generation and seventh generation of black shell lines. To assess the progress of potential genetic improvement, the progeny of two generations of black shell lines were selected to evaluate their shell heights via a 450-day farming experiment. As the results, after growing for 450 days, the sixth generation and seventh generation of selected lines were 9.03% and 11.42% larger than the control lines, respectively. During the grow-out stage, the genetic gain of two generations was 8.82% ± 0.18% and 11.54% ± 0.43%, respectively; and the corresponding realized heritability was 0.45 ± 0.04 and 0.41 ± 0.04, respectively. These results indicated that the mass selection for shell height achieved steady progress in the two generations of C. gigas.

关 键 词：Pacific OYSTER CRASSOSTREA GIGAS mass selection black shell LINE genetic gain realized HERITABILITY 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]