Underwater radio-telemetry for measuring neural activity of fish

在本研究中，我们利用水下无线电遥测技术，测量了在自然环境中自由游动的鱼的中枢神经活动。特别是，我们致力于开发一种新型水下天线（我们称之为aquaerial）。水下天线由一组单元接收天线组成，每个天线通过同轴电缆通过定向耦合放大器连接。利用我们已经开发的这种水生仪器和微型发射器（Kudo and Satou, 1990; Kudo et al.，提交），我们可以测量在自然河流中自由游动的鲑鱼嗅球的脑电波活动。

In this study we aimed at measuring the central nervous activity, by means of underwater radio-telemetry technique, from the fish freely swimming in natural environments. Especially, we aimed at developing a novel underwater antenna (which we named aquaerial). The aquaerial consisted of an array of unit receiving antennas, each of which was connected by the coaxial cable via a directional coupling amplifier. By using this aquaerial and the miniature transmitter, which we had already developed (Kudo and Satou, 1990 ; Kudo et al., submitted), we could measure the electroencephalographic wave activity from the olfactory bulb of salmonid fish freely swimming in natural river.