Perhaps the best-known species is the electric eel ("Electrophorus electricus") which uses powerful electric shocks (up to 600 V) for hunting and self-defense. Other species familiar in the aquarium trade are: the black ghost knifefish ("Apteronotus albifrons"), the glass knifefish ("Eigenmannia virescens"), and the banded knifefish "Gymnotus carapo". 