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Moenkhausia oligolepis, commonly known as the Silver Tetra, is a characin species native to South America. It is characterized by its shimmering silver body, often with a subtle golden or greenish sheen, and a distinctive dark spot on the caudal peduncle. These fish are known for their schooling behavior and active swimming, making them a popular choice for larger community aquariums. They are generally robust and adaptable, thriving in well-maintained environments.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Overall silvery body with iridescent scales, often exhibiting a golden or greenish tint depending on lighting and mood. A prominent, often vertically elongated, dark spot is present on the caudal peduncle, extending onto the base of the caudal fin. Fins are typically hyaline (clear) to slightly yellowish, sometimes with a reddish tinge, especially in males during breeding.
- Scale type
- cycloid
- Mouth position
- terminal
- Distinctive features
- Large, prominent scales (hence 'oligolepis' meaning 'few scales', referring to their relatively large size compared to other tetras)., Distinctive dark spot on the caudal peduncle., Adipose fin present.
- Dorsal fin
- Single, relatively tall dorsal fin, typically with 10-11 rays.
- Tail fin
- Forked caudal fin, often with a dark spot at its base.
- Pectoral fin
- Paired pectoral fins, clear.
- Distinctive fins
- Adipose fin present between the dorsal and caudal fins.
Identification Tips
Body Coloration
Look for the shimmering silver body, often with a golden or greenish iridescence.
Caudal Peduncle Spot
The most reliable identifier is the distinct, often vertically elongated, dark spot on the caudal peduncle, extending onto the base of the caudal fin.
Scale Size
Observe the relatively large and prominent scales compared to many other tetra species.
Adipose Fin
Presence of a small, fleshy adipose fin between the dorsal and caudal fins.
Habitat
- Water type
- freshwater
- Depth
- Typically found in shallow to moderately deep waters, often near the surface or in mid-water.
- Environment
- Inhabits a wide range of freshwater environments including rivers, streams, floodplains, and lakes. Prefers areas with moderate to slow currents, often associated with submerged vegetation, roots, and leaf litter, providing cover and foraging opportunities. Water can range from clear to blackwater conditions.
- Geographic range
- Widespread across South America, particularly in the Amazon, Orinoco, and Guianas river basins. Countries include Brazil, Peru, Ecuador, Colombia, Venezuela, Guyana, Suriname, and French Guiana.
Aquarium Information
- Care level: beginner
- Temperament: semi-aggressive
- Diet: omnivore
- Minimum tank size: 30 gallons (114 liters)
- Temperature: 22-28°C (72-82°F)
- pH level: 5.5-7.5
- Hardness: 5-15 dGH
- Compatibility: Best kept in groups of 6 or more with similarly sized, robust, and active fish. Can be nippy towards slow-moving or long-finned tankmates, especially in smaller groups or tanks.
- Special requirements: Requires ample swimming space and a well-planted tank with open areas. A secure lid is recommended as they can be jumpers. Good filtration and regular water changes are essential for their health.
Wild Information
- Conservation status: least concern
- Seasonality: Breeding typically occurs during the rainy season in their natural habitat, when water levels rise and food sources are abundant.
- Market price: Low to moderate (typically a few dollars per fish)
- Commercial importance: medium
- Taste: Not typically consumed due to small size and bony nature.
- Texture: Not typically consumed.
- Nutritional value: Not typically consumed.
Key Facts
Large Scalesinteresting
The species name 'oligolepis' is derived from Greek, meaning 'few scales', referring to the relatively large size of their scales compared to many other characins, making them appear fewer in number.
Active Schoolersbehavior
Silver Tetras are highly active schooling fish, and keeping them in groups of six or more is crucial for their well-being and to mitigate potential fin-nipping behavior towards other tankmates.
Widespread Distributioninteresting
Moenkhausia oligolepis is one of the most widely distributed species within the genus Moenkhausia, found across numerous major river systems in South America.
Dietary Flexibilitybehavior
In the wild, Silver Tetras are opportunistic omnivores, feeding on a variety of small invertebrates, zooplankton, algae, and detritus, showcasing their adaptability to different food sources.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: not recommended
- Handling notes: No specific handling precautions are required beyond standard fish handling practices to minimize stress and injury to the fish. Avoid prolonged exposure to air. They are not known to bite or possess any harmful spines.
Similar Species
Diamond Tetra
Moenkhausia pittieri
Diamond Tetras have a more compressed body, larger, more reflective scales that give a 'diamond' appearance, and often have longer, more flowing fins, especially the dorsal and anal fins in males. They lack the distinct caudal peduncle spot of M. oligolepis.
Red-eye Tetra
Moenkhausia sanctaefilomenae
Red-eye Tetras are similar in body shape and silver coloration but are distinguished by a prominent red iris in the eye and a more defined, often rectangular, black spot on the caudal peduncle that does not typically extend as far onto the caudal fin as in M. oligolepis. Their scales are generally smaller.
Columbian Tetra
Hyphessobrycon columbianus
Columbian Tetras have a more robust body, often with a blue-green iridescence on the upper body and red fins. While they can have a dark spot on the caudal peduncle, it is usually less pronounced and their overall body shape and fin coloration are distinct.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Characiformes
- Family
- Characidae
- Genus
- Moenkhausia
- Species
- Moenkhausia oligolepis
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