The fish has clear fins with no pattern. The ventrals are light, opaque yellow. Highlights sseen about the gill plates are green. The belly is yellowish. It has a pronounced dark stripe along the length of the body. General color of the body is light, tending towards yellow. Its eyes are gold. It will grow in length up to 5.4 centimeters (2.1 inches).

The blue corydoras or Natterer's catfish, Corydoras nattereri, is a tropical freshwater fish belonging to the Corydoradinae sub-family of the Callichthyidae family. It originates in coastal rivers in South America, and is found in the Brazil from Espírito Santo to Paraná. It was originally described by Franz Steindachner in 1876. It is named for Johann Natterrer, its discoverer.