ウナギの周囲の水中で記録される周期性電位変動

概要

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We have recently found slow potential changes, which were recurring rhythmically, from the water surrounding the body of freshwater fish. In addition, spike potentials appeared periodically in some kinds of fish. Electrodes of Ag-AgCl type, active and indifferent, were put in the medium surrounding an eel (Anguilla japonica) in a vessel, each being separated by 5mm from the body. The indifferent electrode was placed at the tail tip. The slow potentials recorded simultaneously with the mechanogram of opercular movements were related to the respiratory movements of the fish. On the other hand, the spike potentials were identified as ECG by perfect synchronism with the spikes recorded directly from exposed heart. By shifting the active electrode tailwards along the body-side, it was found that slow potentials which were rather large at the mouth region, decreased, and then reached the maximum value and at last disappeared. The size of the spike potentials also changed along the body-side, being maximum beside the eye. The phases of the slow potentials were reversed at the place anterior to, and those of the spikes at the place just posterior to the gill opening, as Fig. 1 shows.
社団法人日本動物学会の論文
1969-03-15