Abstract: An apparatus for selectively affecting the behavior of elasmobranch fish such as rays, skates and sharks, with electromagnetic waves. The apparatus comprises a power source, an electrical circuit capable of generating a selected voltage, current, and alternating frequency, an antenna capable of receiving the converted power from the electrical current and transmitting the converted power as an electromagnetic field, and an optional control means disposed between the power source and the antenna. In operation, this apparatus generates and transmits electromagnetic waves whose effects are perceivable by certain aquatic elasmobranch fish, which can be adjusted to cause a selected behavior, such as attraction or repulsion. The characteristics of the emitted electromagnetic waves can be controlled and changed to fit the desired needs. The apparatus can be self-contained or part of a larger system, and can be incorporated into a variety of devices.

Abstract: A device is provided for compressing a plasma stream flowing in a plasma flow direction and maintaining the plasma stream in the compressed state. The device has a plasma compression region; a plurality of first magnets positioned around the plasma compression region for compressing the plasma stream, each of the first magnets having a dominant magnetic force direction that is non-parallel to the plasma flow direction; a reaction region positioned down stream from the plasma compression region; and a plurality of second magnets positioned around the reaction region for maintaining the plasma stream in its compressed state.

Abstract: A device is provided for adiabatically compressing a plasma stream and maintaining the plasma stream in the compressed state. The device has a plasma compression region; a first plurality of electromagnets positioned around the plasma compression region for compressing the plasma stream; a reaction region positioned down stream from the plasma compression region; and a second plurality of electromagnets positioned around the reaction region for maintaining the plasma stream in its compressed state.

Abstract: The present invention provides an apparatus for selectively affecting the behavior of elasmobranch fish such as rays, skates and sharks, with electromagnetic waves. The apparatus comprises a power source, an electrical circuit capable of generating a selected voltage, current, and alternating frequency, an antenna capable of receiving the converted power from the electrical current and transmitting the converted power as an electromagnetic field, and an optional control means disposed between the power source and the antenna. In operation, this apparatus generates and transmits electromagnetic waves whose effects are perceivable by certain aquatic elasmobranch fish, which can be adjusted to cause a selected behavior, such as attraction or repulsion. The characteristics of the emitted electromagnetic waves can be controlled and changed to fit the desired needs.

Abstract: The present invention provides an apparatus for selectively affecting the behavior of elasmobranch fish such as rays, skates and sharks, with electromagnetic waves. The apparatus comprises a power source, an electrical circuit capable of generating a selected voltage and current in a selected frequency, an antenna to transmit the generated electromagnetic waves, and an optional control means disposed between the power source and the antenna. In operation, this apparatus generates and transmits electromagnetic waves whose effects are perceivable by certain aquatic elasmobranch fish, which can be adjusted to cause a selected behavior, such as attraction or repulsion. The characteristics of the emitted electromagnetic waves can be controlled and changed to fit the desired needs.

Abstract: A device is provided for adiabatically compressing a plasma stream and maintaining the plasma stream in the compressed state. The device has a plasma compression region; a first plurality of electromagnets positioned around the plasma compression region for compressing the plasma stream; a reaction region positioned down stream from the plasma compression region; and a second plurality of electromagnets positioned around the reaction region for maintaining the plasma stream in its compressed state.