An Electrode Chamber for Recording Respiratory and Other Movements of Free-swimming Animals

By their effects on equilibrium potentials, water currents produced by respiratory and other movements of freely-moving animals cause changes in the potential difference between stainless steel electrodes set at opposite ends of an open system continuous-flow animal chamber. The changes are in the microvolt range, but they can be used for continuous or intermittent recording of the animalˈs responses in short-term or long-term studies under widely varied environmental conditions, and the method seems suitable for monitoring.