_Pristella maxillaris_ is small, reaching a maximum length of about 2 inches (5 centimeters). Its body is elongated and compressed laterally. Its most striking feature is its lack of scales, which makes its body appear transparent. This transparency allows the internal organs of the fish to be visible, hence its common name.
The x-ray fish has a silvery coloration with a greenish or bluish tint. Its fins are transparent, and its eyes are large and black. It is a schooling fish, living in groups. In the wild, _Pristella maxillaris_ inhabits clear, slow-moving rivers and streams with plenty of vegetation.
These fish primarily feed on small insects, crustaceans, and zooplankton. In an aquarium, they can be fed with various small live or frozen foods, as well as commercial fish flakes.
The x-ray fish is a peaceful species, making it suitable for community tanks with other small, non-aggressive fish. They prefer warm, well-oxygenated water with a pH between 6.0 and 8.0. They can be kept in a wide range of temperatures, but thrive best between 72- 78°F (22-26°C).
The x-ray fish is a hardy and adaptable species, making it a good choice for both experienced and beginner aquarium enthusiasts. Its fascinating transparent body and peaceful nature make it an interesting and enjoyable fish to keep.