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Enteromius radiatus, commonly known as the Red-tailed Barb, is a small to medium-sized freshwater fish belonging to the family Cyprinidae. It is characterized by its generally silvery body and distinctive reddish coloration on its caudal fin, which gives it its common name. This species is known for its active schooling behavior and adaptability to various freshwater environments.
Physical Characteristics
- Body shape
- torpedo
- Coloration
- The body is generally silvery to golden-brown, often with a faint lateral stripe or series of dark spots along the lateral line, which can be more pronounced in some populations or during breeding. The most distinguishing feature is the bright red to orange coloration on the caudal fin, particularly on the outer rays and posterior margin. Fins are typically hyaline (clear) to yellowish, with the caudal fin being the most vibrant.
- Scale type
- cycloid
- Mouth position
- terminal
- Distinctive features
- Bright red to orange caudal fin, Small, often indistinct, dark spots along the lateral line, Two pairs of small barbels at the mouth (rostral and maxillary)
- Dorsal fin
- Single dorsal fin, typically with 3-4 unbranched and 8 branched rays. The last unbranched ray is often ossified and serrated posteriorly.
- Tail fin
- Deeply forked caudal fin with prominent red/orange coloration.
- Pectoral fin
- Paired pectoral fins, relatively small.
- Distinctive fins
- Anal fin with 3 unbranched and 5 branched rays. Pelvic fins are present.
Identification Tips
Caudal Fin Coloration
The most reliable identifier is the distinct red or orange coloration on the caudal (tail) fin, especially noticeable in adult specimens.
Body Shape and Size
A relatively slender, torpedo-shaped body, typically reaching up to 15 cm (6 inches) in length.
Barbels
Presence of two pairs of small barbels around the mouth, though these can be difficult to observe without close inspection.
Lateral Line Spots
Look for a series of small, often faint, dark spots or a broken lateral stripe along the body, which can vary in prominence.
Habitat
- Water type
- freshwater
- Depth
- Typically found in shallow to moderate depths, often near the surface or in mid-water.
- Environment
- Inhabits a variety of freshwater environments including rivers, streams, lakes, swamps, and floodplains. Prefers areas with clear to slightly turbid water, often with submerged vegetation, rocky substrates, or sandy bottoms. Can tolerate a range of water flow conditions from slow-moving to moderately fast-flowing.
- Geographic range
- Widespread across much of sub-Saharan Africa, including countries like South Africa, Botswana, Namibia, Zimbabwe, Zambia, Malawi, Mozambique, and parts of Angola and the Democratic Republic of Congo. Its distribution is primarily associated with major river systems such as the Zambezi, Okavango, Limpopo, and Congo basins.
Aquarium Information
- Care level: beginner
- Temperament: peaceful
- Diet: omnivore
- Minimum tank size: 75 liters (20 gallons)
- Temperature: 22-26°C (72-79°F)
- pH level: 6.0-7.5
- Hardness: 5-15 dGH
- Compatibility: Excellent community fish, compatible with other peaceful, similarly sized species such as tetras, rasboras, other small barbs, and peaceful cichlids. Avoid keeping with very large or aggressive fish that might prey on them.
- Special requirements: Requires a well-planted aquarium with open swimming areas. Benefits from a strong current and good filtration. Best kept in schools of 6 or more individuals to reduce stress and encourage natural behavior.
Wild Information
- Conservation status: least concern
- Seasonality: Breeding typically occurs during the rainy season when water levels rise and food is abundant. No specific seasonal fishing restrictions are widely enforced due to its 'least concern' status and relatively low commercial importance.
- Market price: Low
- Commercial importance: low
- Taste: Mild, slightly earthy
- Texture: Flaky, tender
- Cooking methods: Frying, Grilling, Steaming
- Nutritional value: Good source of protein and omega-3 fatty acids, typical of freshwater fish.
Key Facts
Active Schoolersbehavior
Red-tailed Barbs are highly social fish and thrive when kept in groups of six or more, exhibiting more natural behaviors and vibrant coloration.
Habitat Adaptabilityinteresting
This species is remarkably adaptable, found in a wide range of freshwater habitats from fast-flowing rivers to stagnant swamps, showcasing its resilience.
Dietary Generalistsbehavior
As omnivores, Red-tailed Barbs consume a varied diet of small invertebrates, algae, and detritus, playing a role in nutrient cycling within their ecosystems.
Taxonomic Reclassificationevolution
Originally classified under the genus Barbus, the Red-tailed Barb was reclassified into Enteromius as part of a broader taxonomic revision of African barbs.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: No specific handling precautions are required beyond standard fish handling practices to minimize stress to the fish. They are not venomous and do not possess sharp spines that pose a significant threat.
Similar Species
Straight-fin Barb
Enteromius paludinosus
E. paludinosus generally lacks the prominent red caudal fin coloration of E. radiatus. Its body is typically more uniformly silvery, and it often has a more distinct dark lateral stripe rather than individual spots.
Orangefin Barb
Enteromius eutaenia
While E. eutaenia also has orange/red fins, its caudal fin coloration is usually more uniformly orange and less intensely red than E. radiatus. E. eutaenia often has a more pronounced dark lateral stripe and a slightly different body shape.
Sidespot Barb
Enteromius anoplus
E. anoplus typically has a more prominent, often larger, dark spot on its flank, usually above the pectoral fin, and lacks the strong red caudal fin coloration. Its body is generally deeper than E. radiatus.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Cypriniformes
- Family
- Cyprinidae
- Genus
- Enteromius
- Species
- radiatus
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