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      Abnormal Karyotype of Pen Shell ( Atrina pectinata) During Its Early Embryonic Development in Late Breeding Season

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          The pen shell, Atrina pectinata, distributes globally. It is one of the most important edible bivalves in east Asian countries. However,there are multiple difficulties in rearing pen shell larvae and juveniles because of their high mortality. To understand the mechanism underlining such high mortality at the early embryonic development stage, we obtained approximately 100 million larvae during later breeding season in June, 2017, and checked a large amount of mitotic chromosomal plates of the early embryos and post-spawning gonads tissue slices of their parents. The results showed that most diploid A. pectinata embryos have 17 pairs of chromosomes ( 2n = 34) as their parents do. The first pair of particularly large chromosomes are heterotypic in some diploid embryos while they are homomorphic in others. The primary sex-determination chromosome type is XX/XY. A lot of triploid, pentaploid and aneuploid embryos with different numbers of the largest homomorphic or heteromorphic chromosomes were found due to the degeneration of overmatured parent gonads which hold normal karyotype. These larvae will die even though most of them may develop into the trochophore stage with 34 chromosomes. Genetic deficiency of chromosomes will cause a high rate of mortality in early embryos in late breeding season. These findings should enrich the current knowledge of juvenile pen shell aquaculture.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          10 July 2020
          01 August 2020
          : 19
          : 4
          : 902-910
          1Key Laboratory for Sustainable Development of Marine Fisheries of Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Science, Qingdao 266071, China
          2Laboratory for Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
          3Rizhao Ocean and Fisheries Research Institute, Rizhao 276826, China
          4College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China
          Author notes
          *Corresponding author: YANG Aiguo, E-mail: yangag@
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          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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