What is Electric fish?
[[Image:Electric-eel2.jpg|thumb|[[Electric eel]]s can make an electrical field]] An '''electric fish''' is a [[fish]] that can make [[electric field]]s.<ref>Albert J.S. & Crampton W.G.R. 2006. Electroreception and electrogenesis. pp. 431–472. In: Evans, David H. & Claiborne, James B. (eds) 2006. ''The Physiology of Fishes''. 3rd ed, CRC Press. ISBN 978-0-8493-2022-4</ref><ref>Fishes that can make electricity are ''electrogenic''; those that can detect electric fields are called ''[[electroreception|electroreceptive]]''.</ref> Many fish ([[shark]]s, [[ray]]s, and [[catfish]]) can detect electric fields: they are 'electroreceptive'. They cannot make electric fields, and are not called electric fish. ==Strongly and weakly electric fish== Electric fish have a special organ that makes electricity. This organ is called an '''electric organ'''. It is usually near the tail of the fish. It is made from specialised muscle or nerve cells. When the organ releases electricity this is called an ''electric organ discharge'' (or ''EOD'' for short).<ref>Alves-Gomes J. 2001. The evolution of electroreception and bioelectrogenesis in teleost fish: a phylogenietic perspective. ''Journal of Fish Biology''. '''58''' (6): 1489–1511. [https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1095-8649.2001.tb02307.x]</ref> Based on the strength of the EOD, the electrogenic fish are two types: *''Strongly electric fish'': Their discharge is so strong they can stun (and capture) [[prey]] with it. Examples of such fish are the [[electric eel]] (which is a [[knifefish]], not a [[eel|true eel]]), [[electric catfish]]es, or [[electric ray]]s *''Weakly electric fish'': Their discharge is not strong enough to stun prey with it; rather, they use the electricity to locate objects, to navigate, or to communicate with other electric fish. Examples of weakly electric fish are [[Peters' elephantnose fish]] or the [[black ghost knifefish]]. In total, there are 348 known [[species]] of electric fish, in about 56 [[genera]]. The only known species that