Effects of Lethal Levels of Environmental Hypercapnia on Cardiovascular and Blood-Gas Status in Yellowtail, Seriola quinqueradiata

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概要

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• The cardiorespiratory responses were examined in yellowtail, Seriola quinqueradiata exposed to two levels of hypercapnia (seawater equilibrated with a gas mixture containing 1% CO_2 (water PCO_2=7mmHg) or 5% CO_2 (38mmHg)) for 72hr at 20℃. Mortality was 100% within 8hr at 5% CO_2, while no fish died at 1% CO_2. No cardiovascularvariables (cardiac output, Q; heart rate, HR; stroke volume, SV and arterial blood pressure, BP) significantly changed from pre-exposure values during exposure to 1% CO_2. Arterial CO_2 partial pressure (PaCO_2) significantly increased (P<0.05), reaching a new steadystate level after 3hr. Arterial blood pH (pHa) decreased initially (P<0.05), but was subsequently restored by elevation of plasma bicarbonate ([HCO_3^-]). Arterial O_2 partial pressure (PaO_2), oxygen content (CaO_2), and hematocrit (Hct) were maintained throughout the exposure period. In contrast, exposure to 5% CO_2 dramatically reduced Q (P<0.05) through decreasing SV (P<0.05), although HR did not change. BP was transiently elevated (P<0.05), followed by a precipitous fall before death. The pHa was restored incompletely despite a significant increase in [HCO_3^-]. PaO_2 decreased only shortly before death, whereas CaO_2 kept elevated due to a large increase in Hct (P<0.05). We tentatively conclude that cardiac failure is a primary physiological disorder that would lead to death of fish subjected to high environmental CO_2 pressures.

• 社団法人日本動物学会の論文
• 2003-04-25

著者

• ISHIMATSU ATSUSHI

  Institute for East China Sea Research, Nagasaki University

• Ishimatsu A

  Nagasaki Univ. Nagasaki

• Ishimatsu Atsushi

  Inst. For East China Sea Res. Nagasaki Univ.

• Ishimatsu Atsushi

  Marine Research Institute Nagasaki University

• Kita J

  Demonstration Laboratory Marine Ecology Research Institute

• Lee Kyoung-seon

  Marine Research Institute Nagasaki University

• Kita Jun

  Research Institute Of Innovative Technology For The Earth (rite)

• Ishimatsu Atsushi

  Noma Fisheries Station Nagasaki University

• Kita Jun

  Research Institute of Innovative Technology for the Earth

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