Effects of Hypoxic Stress on Energy Metabolism in Red Sea Bream, Pagrus major-I Stress Response and Energy Status in Various Tissues of Red Sea Bream, Pagrus major, Subjected to Hypoxic Exposure.

• ISHIBASHI Yasunori

  Department of Fisheries, School of Agriculture, Kinki University

• HIRATA Hachiro

  Department of Fisheries, School of Agriculture, Kinki University

• KUMAI Hidemi

  Fisheries laboratory, Kinki University

Bibliographic Information

Other Title

• 低酸素負荷に対するマダイのストレス反応および各種組織のエネルギー状態
• Effects of hypoxic stress on energy metabolism in red sea bream, Pagrus major-1 Stress response and energy status invarious tissues of red sea bream, Pagrus major, subjected to hypoxic exposure

Abstract

Young red sea bream, Pagrus major, were exposed to a gradual decrease in partial pressure of oxygen (Po₂) down to 20 mmHg for 5 h, and then sustained under 20 mmHg Po₂ for an additional 3 h at 19.9°C. Fish respiratory frequency slowly increased and attained a peak level at approximately 35 mmHg Po₂, and then gradually decreased. Fish sank to the tank bottom about an hour after Po₂ fell below 20 mmHg, and respiration began to arrest after another hour. Hematocrit value increased and mean cellular hemoglobin content (MCHC) decreased with increasing hypoxia load. Plasma cortisol and glucose levels were significantly augmented when respiratory frequency decreased. ATP, total adenylate (TA) concentration and energy charge (EC) in the hepatopancreas, in addition to TA in the kidney, were considerably diminished by hypoxia. However, this was not observed in the gill and brain of all fishes prior to respiratory arrest. In the hepatopancreas, levels of ATP, TA and EC notably declined as respiratory frequency decreased. These results show that the cortisol stress response to hypoxia is significantly induced with the decreased respiratory frequency. Decreased energy status in the hepatopancreas appears to be important and occurs with stress response as a metabolic depression in the whole body.

Journal

• Aquaculture Science

  Aquaculture Science 50 (3), 315-323, 2002

  Japanese Society for Aquaculture Science

Keywords

• Red sea bream
• Hypoxic stress
• Cortisol
• Adenine nucleotide concentration

Details

• CRID: 1390001204716243328
• NII Article ID: 10009935622
• NII Book ID: AN00124667
• DOI: 10.11233/aquaculturesci1953.50.315
• ISSN: 21850194
• ISSN: 03714217
• NDL BIB ID: 6323350
• Web Site: https://agriknowledge.affrc.go.jp/RN/2030661233
• Web Site: http://id.ndl.go.jp/bib/6323350
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6323350
• Text Lang: en
• Data Source:
  • JaLC
  • IRDB
  • NDL
  • CiNii Articles
• Abstract License Flag: Disallowed