Abstract

Apparatus and method for measuring power density in an energized volume of water using either a measurement of voltage gradient or current density for use in determining optimal electrical power parameters for electrofishing, in-water electroshocking, electrical barrier control and the like. Specific probes for either measurement are disclosed. A calculator or programmed microprocessor receives measurements of current density or voltage gradient and water conductivity at a selected location within an energized liquid body and performs the mathematical operations necessary to calculate power density. Values on a graph of water conductivity, current density, voltage density and power density are used to determine how much electrical power to apply to a specific organism in a specific volume of liquid.