Neptun as a new generation of electrical barriers
The NEPTUN system is a new approach to the generation of electric field in water and its impact on fish.
In the NEPTUN system is a method of producing between a set of positive and a set of negative electrodes a growing non-linear electric field in an aqueous environment. Fish flowing down or upstream in the direction of the protected object first reach a row of positive electrodes. Negative electrodes are closest to the protected object.
In the area between positive and negative electrodes an electric field is generated, the intensity of which increases as it approaches the protected object. Thus large and medium fish react to the electric field in the vicinity of positive electrodes, whereas small ones react in the middle part of the inter-electrode area or in the vicinity of negative polarized electrodes. Such a field distribution is obtained by applying electrodes of different active area and by proper arrangement of the electrodes in relation to each other.