A study of the effects of water carbonate alkalinity on some parameters of blood acid-base status in rainbow trout (Salmo gairdneri R.)期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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A study of the effects of water carbonate alkalinity on some parameters of blood acid-base status in rainbow trout (Salmo gairdneri R.)

Authors:	Serge Thomas Joseph Poupin

Institution:	(1) Laboratoire de Physiologie Animale, Faculté des Sciences et Techniques, F-29283 Brest Cédex, France

Abstract:	Summary The effects of two levels of water carbonate alkalinity (CA=0.3–0.5 meq·l⁻¹ and CA=12–13.5 meq·l⁻¹) on arterial blood acid-base status ( $Pa_{CO_2}$ , pHa, HCO ₃ ⁻ ]+CO ₃ ⁻⁻ ]), oxygen consumption ( $\dot M_{O_2 }$ ) and plasma ionic composition (Na⁺, K⁺, Cl⁻) were investigated in trout living in normoxic-normocapnic water at 15°C. The results show that a high level of carbonate alkalinity induced a decrease in $Pa_{CO_2}$ and a situation of mixed respiratory and metabolic acidosis compared to that in low CA water. These changes are accompanied by significant changes in ionic composition but the levels of oxygen consumption are unchanged. The role of the different capacitance coefficients of water for CO₂ and the effects of the different ionic composition of water on ionic and gascous exchanges are discussed. Equipe de Recherche associée au CNRS N° 070622

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