Porotergus is a genus of ghost knifefishes found in the Amazon and Essequibo basins in tropical South America.

They are found over sandy bottoms in shallow (P. gymnotus) or deep rivers (two remaining).

[1] They feed on small aquatic insect larvae.

They have a stubby snout and are fairly small knifefish, with the largest species reaching up to 27 cm (11 in) in total length.

[1] There are currently three described species in this genus:[2] The base of UCLA's central flag pole, a gift to the university from Jacob Gimbel, features a brass plaque depicting P. gimbeli.