Description

These fish are native to the freshwater Atrato and San Juan River basins of Colombia in South America. They frequent areas that are slow-moving, such as small tributaries and streams, where the temperature ranges from 73 to 80 degrees Fahrenheit.

Though the emperor tetra is distributed over a narrow range in the wild, it has become a favorite aquarium pet and is farmed for sale around the world. As of 2014, the IUCN Red List (International Union for Conservation of Nature and Natural Resources) has insufficient data to determine the status of this species in its natural habitat in the wild; more research is needed. In captivity, the species breeds readily.

Color and Markings

The attractive coloration and elegant fins of the regal emperor tetra leave little doubt why the emperor tetra was given its name. Introduced to home aquaria in 1960, it has become one of the more popular of the tetra family of fishes.

Fins of both sexes have a yellow hue and are edged in black on the outer periphery; they are red where the fin meets the body. The body of the fish is blue-gray with mauve tones, and it displays an almost iridescent sheen. A dark stripe runs horizontally from head to tail, and the body is lighter in color below the stripe.

Tankmates

A schooling fish, the emperor tetra does best in groups of five or six with a single alpha male, though it can thrive as a mated pair. It is also a peaceful species, and thus ideal for a relatively small community tank though it will be disturbed by more boisterous species.

Some compatible species include danios, rasboras, other tetras, and peaceful catfish species such as Corydoras or smaller Loricariids. Pencil fish and dwarf cichlids are also good choices, especially as they hail from the same general region. You may want to choose species that contrast visually with the colorful emperor tetra to create a palette that pleases the eye.

Emperor Tetra Habitat and Care

Emperors favor dense vegetation and subdued lighting that mimics the Colombian rivers from which they originate. Dark substrate and a heavily planted tank will go far to make them feel at home; these also provide a gorgeous backdrop to this species’ brilliant colors.

Although peat filtration is recommended, they will thrive in even moderately hard water as long as it is changed frequently to maintain purity. These fish prefer quiet habitats and should only be kept with other peaceful species that share similar water requirements.

Emperor Tetra Diet and Feeding

In the wild, the emperor tetra feeds mainly on worms and crustaceans. Undemanding in terms of their diet, captive emperor tetras will readily accept flake foods, freeze-dried foods, and frozen foods. Live foods such as daphnia, mosquito larvae, and brine shrimp are especially relished and are excellent when conditioning breeding pairs.