Kennedy's Tetra - Ctenobrycon kennedyi Fish Profile & Care Guide
Introduction
The Kennedy's Tetra (Ctenobrycon kennedyi is a small South American Tetra found within freshwater river systems in South America. Adults can reach approximately 6 cm in standard length and have a deep, laterally compressed body with a predominantly silver appearance. Although relatively uncommon in the aquarium trade, it is an active and generally peaceful species that can make an attractive addition to a carefully planned community aquarium.
The Kennedy's Tetra is a social fish that should be maintained as part of a proper shoal rather than alone or in a small group. A minimum of eight individuals is recommended, although a group of ten or more will provide greater security and encourage more natural behaviour. When comfortable, the fish usually spread around the middle areas of the aquarium and regroup when startled or threatened. Keeping an adequately sized shoal can also prevent individual fish from becoming withdrawn or directing too much attention towards their tankmates.
The Kennedy's Tetra is best housed with peaceful fish of a similar size and activity level. Suitable companions can include other medium-sized tetras, rasboras, Corydoras catfish, small loricariids and peaceful dwarf cichlids. Very slow-moving, timid or long-finned fish are less suitable because they may be unsettled by the tetra’s active swimming. Large predatory species should also be avoided, as should extremely small fish or fry that could be viewed as food. Providing sufficient space and maintaining a good-sized shoal will help the fish behave more naturally within a community aquarium.
A mature aquarium with a frontage of at least 75 cm is recommended for a shoal of Kennedy's Tetras, with larger accommodation preferred when the fish are being kept in a mixed community. The aquarium should combine open swimming space with planted or shaded areas where the fish can retreat. Slightly acidic to near-neutral pH and soft to moderately hard water are appropriate for these fish. Filtration should maintain clean, well-oxygenated water without producing an excessively forceful current. Regular partial water changes and stable water conditions are more important than attempting to achieve an exact numerical reading.
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Sexual Dimorphism
Sexual dimorphism in Kennedy's Tetra is subtle, and males and females can be difficult to distinguish outside the breeding period. Mature females generally develop a deeper, fuller abdomen as their ovaries fill with eggs, while males usually retain a slimmer and more streamlined body shape. These differences are most noticeable in healthy, fully grown fish that are in breeding condition. Dependable differences in colouration or fin shape have not been scientifically established for this species, so body condition should be treated as a useful indication rather than a guaranteed method of determining sex.
Quick Facts
| Scientific Name | Ctenobrycon kennedyi |
|---|---|
| Year Described | 1903 |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Characiformes |
| Family | Acestrorhamphidae |
| Genus | Ctenobrycon |
| Origins | Argentina Bolivia Brazil Paraguay |
| Approx Max Size | 6 cm |
| Temperament | Peaceful |
| Aquarium Level | Middle - Top |
| Difficulty | Beginner - Intermediate |
| Shoaling | Yes |
| Best kept as | Groups 8+ |
| Diet & Feeding | Omnivore |
| Reproduction | Egg-Scatterer |
| Average Lifespan | Up to 5 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 5.5 - 7.0 |
| GH | 2 - 12 |
| KH | 1 - 4 |
| TDS | 80 - 200 |
| ℉ | 72 - 82 |
|---|---|
| ℃ | 22 - 28 |
Natural Habitat
The Kennedy's Tetra is a South American freshwater fish native to the Paraguay–lower Paraná river system and the São Francisco River basin. Its recorded range includes parts of Argentina, Bolivia, Brazil and Paraguay. Populations are also established in sections of the upper Paraná basin, where the species is considered non-native following the removal of natural geographic barriers associated with the construction of the Itaipu Dam.
The species is primarily associated with calm or slow-moving freshwater environments, including floodplain lakes, lagoons, pools, sheltered river margins and reservoir edges. It is commonly found around aquatic vegetation, which provides feeding areas, cover from predators and suitable habitat for young fish. These environments may experience seasonal changes in depth and connectivity as surrounding rivers rise and flood adjacent areas.
Breeding
The Kennedy's Tetra is an egg-laying species that reproduces through batch spawning, meaning a female develops and releases groups of eggs over more than one spawning event rather than depositing her entire reproductive output at once. In the wild, reproductive activity appears to increase during periods of heavier rainfall, when rising water levels, abundant food and expanded vegetation provide favourable conditions for the survival of young fish.
Captive breeding has not been documented in enough detail to provide a dependable species-specific method. However, breeding would be most safely attempted in a separate, mature aquarium containing fine-leaved plants or spawning mops, with a mesh or layer of marbles protecting any scattered eggs from the adults. A well-conditioned group should be introduced to soft, slightly acidic water, and the adults should be removed once spawning has taken place because there is no evidence that this species provides parental care. Newly free-swimming fry are likely to require microscopic foods initially, followed by newly hatched brine shrimp or similarly small live foods as they grow.
Diet & Feeding
The Kennedy's Tetra is an adaptable omnivore. Studies of wild fish have found a varied diet consisting mainly of aquatic food sources, particularly small benthic organisms and detritus, with aquatic invertebrates, algae and plant material also being consumed. Its ability to adjust its diet according to the available resources suggests that it is not a highly specialised feeder.
In the aquarium, it should be offered a varied diet based on good-quality flakes or suitably sized granules. These can be supplemented regularly with small live or frozen foods such as Artemia, Daphnia, bloodworm and mosquito larvae. Including some food containing plant or algae-based ingredients will provide a more balanced diet. Feed small portions once or twice daily, offering only what the fish can consume quickly to avoid uneaten food affecting the water quality.
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Published: 14 Jul 2026
Last Updated: 21 Jul 2026