Response to Selection for Fast Growth in the Second Generation of Pacific Oyster (Crassostrea gigas)  

作　　者：WANG Qingzhi LI Qi KONG Lingfeng YU Ruihai 

机构地区：[1]Liaoning Ocean and Fishery Science Research Institute,Dalian 116023,P.R.China, [2]Key Laboratory of Mariculture,Ministry of Education,Ocean University of China,Qingdao 266003,P.R.China

出　　处：《Journal of Ocean University of China》2012年第3期413-418,共6页中国海洋大学学报（英文版）

基　　金：supported by the National High Technology Research and Development Program (2006AA10A409);the National Basic Research Program of China (2010CB126406)

摘　　要：Mass selection for fast growth was conducted in three Pacific oyster (Crassostrea gigas) stocks from China, Japan and Korea using previously established lines (CS1, JS1, and KS1). To determine whether continuous progress can be achieved by selection for growth, the progeny of three second-generation Pacific oyster lines was selected for shell height and evaluated via a 400-day farming experiment. When harvested at the end of the experiment, the selected crosses of CS2, JS2, and KS2 lines grew by 9.2%, 10.2% and 9.6% larger than the control crosses, respectively. During grow-out stage, the genetic gain of three selected lines was (10.2 ± 1.4)%, (10.4 ± 0.3)%, and (8.4 ± 1.6)%, respectively; and the corresponding realized heritability was 0.457 ± 0.143, 0.312 ± 0.071 and 0.332 ± 0.009, respectively. These results indicated that the selection for fast growth achieved steady progress in the second generation of oyster. Our work provides supportive evidence for the continuity of the Pacific oyster selective breeding program.Mass selection for fast growth was conducted in three Pacific oyster （Crassostrea gigas） stocks from China, Japan and Korea using previously established lines （CS1, JS1, and KS1）. To determine whether continuous progress can be achieved by selection for growth, the progeny of three second-generation Pacific oyster lines was selected for shell height and evaluated via a 400-day farming experiment. When harvested at the end of the experiment, the selected crosses of CS2, JS2, and KS2 lines grew by 9.2%, 10.2% and 9.6% larger than the control crosses, respectively. During grow-out stage, the genetic gain of three selected lines was （10.2 ± 1.4）%, （10.4 ± 0.3）%, and （8.4 ± 1.6）%, respectively; and the corresponding realized heritability was 0.457 ± 0.143, 0.312 ± 0.071 and 0.332 ± 0.009, respectively. These results indicated that the selection for fast growth achieved steady progress in the second generation of oyster. Our work provides supportive evidence for the continuity of the Pacific oyster selective breeding program.

关 键 词：Pacific oyster Crassostrea gigas mass selection second generation genetic gain realized heritability 

分 类 号：S968.311[农业科学—水产养殖] TH843[农业科学—水产科学]