Banjo catfish

Aspredinidae (order Siluriformes), also known as the Banjo catfish, is a family of freshwater fish found in the rivers or in coastal brackish water of South America. Banjo catfish lack an adipose fin. They received this name because of their flat bodies, resembling a small banjo. There are around thirteen genera and 33 species of banjo catfish. These fish are primarily nocturnal and bury their bodies in the substrate. They are popular aquarium fish.