Respiration and Blood Properties of Porgy in Hypoxic Conditions with Special Reference to Minimum Requirement of Ambient Oxygen.

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  • AZUMA Teruo
    Department of Fisheries, Faculty of Agriculture, Kyushu University Nikko Branch, National Research Institute of Aquaculture
  • ITAZAWA Yasuo
    Department of Fisheries, Faculty of Agriculture, Kyushu University

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Other Title
  • 低酸素圧下におけるマダイの呼吸・血液特性と最小必要酸素圧
  • Respiration and Blood Properties of Por

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Abstract

The minimum requirement of dissolved oxygen in the ambient water for a porgy Pagrus major was estimated by examining respiratory responses and blood properties under stepwise hypoxic conditions induced either by nitrogen bubbling or in a closed system at 21°C. The minimum requirement was estimated to be around 60 mmHg without carbon dioxide accumulation (N2-bubbling method), and around 80 mmHg under carbon dioxide accumulation (closed method) . This difference is considered to be attributed to Bohr effect, because the partial pressure of carbon dioxide in the arterial blood dropped in the former and elevated in the latter. The practical criterion as the minimum requirement of ambient oxygen for the porgy is considered to be around 80 mmHg (around 50% in air saturation), because hypoxic conditions in fish farms and natural environments are usually accompanied with accumulation of carbon dioxide.

Journal

  • Aquaculture Science

    Aquaculture Science 46 (1), 83-92, 1998

    Japanese Society for Aquaculture Science

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