Fisheries Science

, Volume 85, Issue 2, pp 369–377 | Cite as

Impact of nighttime hypoxia on ark shell Scapharca broughtonii mortality on a semi-enclosed embayment seabed

  • Kei SenbokuyaEmail author
  • Shiho Kobayashi
  • Noriyuki Ookei
  • Yoh Yamashita
Original Article Aquaculture


The ark shell Scapharca broughtonii population has decreased markedly in recent years in Nanao Bay, a semi-enclosed embayment in Japan. Continuous measurement of dissolved oxygen (DO) at the bottom of Nanao Bay was performed, and S. broughtonii survival rates were investigated experimentally and in situ. In summer the DO concentration showed diel variation, with generally sufficient oxygen during the day but concentrations < 2 mg/l at night. In rearing experiments to investigate their physiological state, ark shells were placed in a tank designed to produce hypoxic conditions at night. Blood succinate levels in the ark shells increased, and all individuals were dead after 35 days. The results of the study indicate that the main cause of mortality of S. broughtonii on the seabed in Nanao Bay is hypoxia at night.


Infaunal bivalve Dissolved oxygen Enclosed waters Shallow waters Succinate 



We are grateful to the former union president, the late Mr. S. Nishizaki, and the counselor, Mr. Y. Kusunoki, of the Nanao branch of the Ishikawa Prefecture Fisheries Cooperative Associations. We also thank the staff of the Ishikawa Fisheries Research Center. This work was financially supported by the Nippon Life Insurance Foundation and the Link Again Program of the Nippon Foundation.


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Copyright information

© Japanese Society of Fisheries Science 2019

Authors and Affiliations

  1. 1.Ishikawa Prefecture Fisheries Research Center Production Department Mikawa OfficeHakusanJapan
  2. 2.Field Science Education and Research CenterKyoto UniversityKyotoJapan
  3. 3.Ishikawa Prefecture Fisheries Research CenterNotoJapan

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