Biomonitoring of water contamination based on analysis of the action potential of killifish

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In this study, based on the fact that respiratory impairment in fish serves as a good indicator of toxicant exposure stress, the electric field resulting from respiratory muscle action potentials were measured and analyzed. In order to detect the electric field accurately, titanium alloy electrodes were used. The toxicant used were potassium cyanide and insecticide Sumithion (fenitrothion) . Acute and sublethal toxic effect was indicated by increased breathing activity. The time characteristic of the power spectrum of the action potential showed that killifish is able to detect a cyanide concentration of 0.1mg/L and a Sumithion of 1mg/L in an hour.