魚類のpH耐性に関する環境生理学的研究 : 1.酸性環境水におけるメダカOryzias latipesの生存時間に影響する種々の無機化学的要因

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Survival time of O.latipes exposed to sulphuric acid solutions decreased with a lowering of pH. There was a linear relationship between log survival time and pH value within the range of pH 2.5 to 5.0. The toxicity of strongly dissociating inorganic and organic acids, such as sulphuric, hydrochloric, citric and oxalic acids, was generally low as compared with that of acetic acid. The presence of NaCl, CaCl_2 and MgCl_2 most effectively prolonged the survival of medaka in strongly acidic environments at the concentrations of 100-200 mM, 30 mM and 50mM, respectively. In contrast, the presence of 100-200 mM NaCl reduced survival time at the control pH value (5.5). Oxygen consumption sharply decreased in acidic solutions, but was hardly affected by the presence of NaCl at pH 4.0 except for 150 mM NaCl which is approximately isotonic to fish blood. Free CO_2 more than 30 ppm increased the toxicity of acidic environment. The acidic environment caused coagulation of mucus, but the presence of Ca ions was effective for the suppression of mucous coagulation.
日本生態学会の論文
1979-09-30