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

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          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.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          12 November 2019
          01 December 2019
          : 18
          : 6
          : 1411-1416
          1Key Laboratory of Mariculture of Ministry of Education, Ocean University of China, Qingdao 266003, China
          2Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
          Author notes
          *Corresponding author: LI Qi
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2019.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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