Emperor Tetra
Also known as: Nematobrycon palmeri
The Emperor Tetra (Nematobrycon palmeri) is a small, strikingly colored freshwater fish native to slow-moving, tannin-stained streams of western Colombia. The Emperor Tetra originates from Colombia, South America, specifically the Atrato and San Juan river basins, reaches 4.5 cm in captivity, typically lives 5, and is kept at 24C (75F). Individual fish vary, so treat this as a general guide rather than a guarantee.
Species at a glance
- Origin
- Colombia, South America, specifically the Atrato and San Juan river basins
- Adult size
- 4.5 cm (1.8 in)
- Life span
- 5
- Temperament
- Peaceful and schooling; best kept in groups of 6 or more
- Tank size
- 60 L (16 gal)
- Water temp
- 24C (75F)
- pH range
- pH 5.5-7.0
- Diet
- Omnivorous; accepts high-quality flakes, micro pellets, and live/frozen foods such as brine shrimp, daphnia, and bloodworms
- Other names
- Nematobrycon palmeri
About the Emperor Tetra
The Emperor Tetra (Nematobrycon palmeri) is a small, strikingly colored freshwater fish native to slow-moving, tannin-stained streams of western Colombia. Males display iridescent blue-green bodies with elongated dorsal and anal fins, while females are slightly less vibrant and more rounded. They thrive in soft, acidic water with subdued lighting and dense vegetation, mimicking their natural blackwater habitat. Emperor Tetras are peaceful community fish that exhibit natural schooling behavior when kept in adequate numbers.
Lifespan and health
With proper care, Emperor Tetras typically live 4 to 6 years in captivity, with some individuals reaching up to 7 years under ideal conditions. Longevity is strongly influenced by water quality, diet, and stress levels; maintaining stable, soft, acidic water and a varied diet significantly increases lifespan. Regular observation for signs of stress or illness is key to early intervention. Common health issues include ich (white spot disease) if water temperatures fluctuate or drop below 22°C (72°F), and fungal infections from poor water quality or injuries. They are also susceptible to internal parasites if fed low-quality live foods excessively. Quarantine new fish and avoid overcrowding; treat ich with gradual temperature increase to 26–27°C (79–81°F) and appropriate medication, and always ensure excellent filtration and minimal organic waste to prevent secondary infections.
Overview
The Emperor Tetra (Nematobrycon palmeri) is a small, strikingly colored freshwater fish native to slow-moving, tannin-stained streams of western Colombia. Males display iridescent blue-green bodies with elongated dorsal and anal fins, while females are slightly less vibrant and more rounded. They thrive in soft, acidic water with subdued lighting and dense vegetation, mimicking their natural blackwater habitat. Emperor Tetras are peaceful community fish that exhibit natural schooling behavior when kept in adequate numbers.
Care and tank setup
For optimal care, provide a minimum 60-liter (16-gallon) tank for a group of 6 Emperor Tetras, though 80+ liters (21+ gallons) is recommended for larger schools. Use a dark substrate, driftwood, and dense planting with species like Java moss, Anubias, or Cryptocoryne to replicate their blackwater environment; floating plants such as Salvinia help diffuse light. Maintain gentle filtration with low flow, as they prefer calm waters, and perform 25% weekly water changes to stabilize parameters. Water conditions should be kept at 24°C (75°F) with a pH between 5.5 and 7.0 and hardness below 10 dGH. Use peat filtration or Indian almond leaves to naturally lower pH and add tannins if needed. Feed small amounts 2–3 times daily, offering a varied diet of crushed flakes, micro pellets, and frozen foods like brine shrimp or daphnia; avoid overfeeding to prevent water quality issues. Emperor Tetras are peaceful and do well with other small, non-aggressive community fish such as Corydoras catfish, small rasboras, pencilfish, or dwarf cichlids like Apistogramma. Avoid keeping them with large or fin-nipping species. A group of at least 6 is essential to reduce stress and encourage natural behavior; males may display minor fin-flaring during courtship but rarely cause harm.
Related breeds
Breed information on this page is based on the Wikipedia article on the Emperor Tetra, supplemented with additional research. Reviewed for accuracy.