Long, cylindrical, scaleless, and usually gray-brown (sometimes with a r.... electr eel

The tail region constitutes about four-fifths of the electric eel's total length, which is bordered along the underside by an undulating anal fin that is used to propel the fish. In one fish survey of a typical varzea, electric eels made up more than 70 percent of the fish biomass. The electric eel is a sluggish creature that prefers slow-moving fresh water, where it surfaces every few minutes to gulp air. The electric eel's penchant for shocking its prey may have evolved to protect its sensitive mouth from injury from struggling, often spiny, fish. The electric eel eats fallen fruit as well as fish, thereby aiding in seed dispersal via defecation. electr eel