Glass Knifefish

Eigenmannia virescens is widespread across the Amazon, Orinoco, and Río de la Plata basins, inhabiting slow-moving, vegetated waters with soft substrate. Its body is highly translucent — the viscera are visible through the flanks — with a greenish or yellowish tint giving it its common name. Unlike Apteronotus species it produces a wave-type EOD at lower frequency and is notably more tolerant of conspecifics when kept in groups of 4 or more. It is active at night and can be trained to accept frozen foods. A rewarding entry-level knifefish that forms the backbone of many South American biotope displays.