Also known as the “Golden Pristella Tetra”, the X-ray fish gains its name from the fact that a large portion of its body is transparent.  The X-ray fish tends to be a good aquarium fish because of its high adaptability and its tolerance for acidic waters and the fact that it eats many different types of food.

Also known as a type of Golden Tetra.

The X-ray fish is found in the South American Coastal Rivers where the freshwater from the river meets the salted water of the ocean.  This is known as an “estuary”, and is also the type of habitat that brackish aquariums tend to try and emulate.

The X-Ray fish has a yellowish tint to it and a prominent dorsal fin.  They may grow as large as 22 cm, however their average size is around 5 cm.  Male X-ray fish are smaller and thinner than female X-Ray fish, however this is the only prominent difference.  When in an aquarium, it is important to keep X-ray fish away from predators and in a large group of six other fish.