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      Mass Selection for Fast Growth in the Third Generation of the Orange Line of the Manila Clam Ruditapes philippinarum

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          The Manila clam Ruditapes philippinarum is natively distributed along the Pacific coast of Asia, where it is one of the most important bivalve species for local fisheries. This species has been intentionally introduced due to its high adaptability to various coastal environments and is currently widely cultivated in Europe and North America. We have initiated a selective breeding program to improve the growth rate of the Manila clam since 2007, and a full-sib family with orange shell color was selected. This family features high survival but slow growth. Thereafter, two generations of mass selection were conducted in this family by 10% upward selection for faster growth. In 2011, three types of lines were produced by selecting the breeder from the second-generation of selected lines. These lines are SS (subject to three generations of selection for growth in shell length), SC (selected for the second but not the third generation), and C (randomly sampled individuals from the national population). The genetic parameters of the shell length including h R 2 (realized heritability), SR (selection response), and GG (genetic gain) were analyzed. Results showed that the shell length of the SS line was significantly larger than those of the SC and C lines at all developmental stages ( P < 0.05). For the larval stage, the values of h R 2, SR, and GG were 0.42, 0.73, and 6.66, respectively. For the juvenile stage, the values of h R 2, SR, and GG were 0.40, 0.69, 21.76, respectively. For grow-out stage, the values of h R 2, SR, and GG were 0.48, 0.83, and 18.22, respectively. The results of h R 2 indicated the good potential of the SS line in selective breeding. The level of GG improvement was encouraging and consistent with the previous expectations. No inbreeding depressions in the shell length were observed in the SS and SC lines at all sampling days. All of the results indicate that maintaining selection pressure in successive generations may be effective in the selective breeding program of this family.

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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
          : 1481-1485
          1Engineering Research Center for Shellfish Culture and Breeding of Liaoning Province, College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
          2Tianjin Key Laboratory of Aqua-Ecology and Aquaculture, Department of Fishery Sciences, Tianjin Agricultural University, Tianjin 300384, China
          3Tianjin Marine Ranching Technical Engineering Center, Tianjin 300457, China
          Author notes
          *Corresponding author: YAN Xiwu
          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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