Underwater radio-telemetry for measuring neural activity of fish

本研究利用水下无线电遥测技术，对自然环境中自由游动的鱼类的中枢神经活动进行了测量。特别是，我们的目标是开发一种新型的水下天线（我们命名为aquaireal）。该天线由一组接收天线组成，每个接收天线通过定向耦合放大器由同轴电缆连接。通过使用我们已经开发的这种水下天线和微型发射器（Kudo和Satou，1990 ; Kudo等人，通过对在自然河流中自由游动的鲑科鱼类嗅球的脑电活动进行测量，

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.