A few species are familiar to the aquarium trade , such as the black ghost knifefish ( `` Apteronotus albifrons '' ) , the glass knifefish ( `` Eigenmannia virescens '' ) , and the banded knifefish ( `` Gymnotus carapo '' ) .
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 '' .