INDEX
Introduction to Bioelectromagnetism
Pigeons
Magnetotactic Bacteria
Electric Eels
Bibliography
Sharks
Sharks also use electromagnetism. They and their cousins, the rays, detect movement through incredibly sensitive electroreceptors connected in a system to detect the electromotive force induced by an animal moving in the water. They doo this through a series of elongated canals emerging from the shark's body through pores in its skin. These canals contain a conductive biological secretion with a jellylike texture. These canals act as biological "wires" to the electroreceptor system. Inside the shark, at the other end of the canals, lies highly sensitive cells that are reactive towards minute changes in voltage. This electromagnetoreceptor system is a proposed mechanism for why sharks are able to detect movement through induction.
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Johnsen, S. & Lohmann, K.J. (2008). Magnetoreception in Animals. Physics Today, 61(3). 29-35. doi:http://dx.doi.org/10.1063/1.2897947