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. The apparatus can be self-contained or part of a larger system, and can be incorporated into devices such as lifejackets, buoys, life rafts, beach protection lines, communication protection lines, surf boards, kayaks, fishing lines, fishing nets, scuba gear, and an optional control means disposed between the power source and the antenna offshore oil drills and refineries.
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