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


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タイトル: Effects of Lethal Levels of Environmental Hypercapnia on Cardiovascular and Blood-Gas Status in Yellowtail, Seriola quinqueradiata
著者: Lee, Kyoung-Seon / Kita, Jun / Ishimatsu, Atsushi
発行日: 2003年 4月
出版者: 日本動物学会
引用: Zoological science, 20(4), pp.417-422; 2003
抄録: 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.
キーワード: yellowtail / hypercapnia / blood gas / cardiac output / CO_2
URI: http://hdl.handle.net/10069/21976
ISSN: 02890003
DOI: 10.2108/zsj.20.417
権利: (c) 2003 Zoological Society of Japan
資料タイプ: Journal Article
原稿種類: publisher
出現コレクション:220 学術雑誌論文

引用URI : http://hdl.handle.net/10069/21976

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