| 摘要 |
An electrically insulated water containable member has a first electrode and a pair of second electrodes bracketing the first electrode. A source of electric power is connected across the first electrode and each electrode of the pair of second electrodes to develop an electric field within the member between the first electrode and each electrode of the pair of second electrodes, which electric field causes narcosis or tetany in any fish present in water within the member and between the pair of second electrodes.
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