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Bagrichthys hypselopterus, commonly known as the Black Lancer Catfish, is a species of bagrid catfish native to Southeast Asia. It is characterized by its striking dark coloration and exceptionally tall, sail-like dorsal fin. These nocturnal fish are typically found in slow-moving to still waters, often associated with submerged vegetation and leaf litter. They are popular in the aquarium trade due to their unique appearance and generally peaceful nature, though they can be territorial with conspecifics.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Predominantly dark brown to black, often with a lighter, sometimes mottled, ventral surface. Some individuals may exhibit faint banding or spotting, especially when young. The fins are typically dark, matching the body.
- Scale type
- none
- Mouth position
- inferior
- Distinctive features
- Extremely tall, sail-like dorsal fin, which is the most prominent feature and gives rise to its common name., Four pairs of long, sensitive barbels around the mouth, used for foraging in low light conditions., Adipose fin present, relatively small., Body is smooth and scaleless.
- Dorsal fin
- Very tall and prominent, with a strong, serrated spine at the leading edge, followed by soft rays. The spine can be locked into an erect position.
- Tail fin
- Deeply forked, with pointed lobes.
- Pectoral fin
- Well-developed, with a strong, serrated spine at the leading edge.
- Distinctive fins
- The exceptionally high dorsal fin is the most distinguishing feature, giving it a unique silhouette among catfish.
Identification Tips
Dorsal Fin
The most obvious identifier is the extremely tall, sail-like dorsal fin, which is disproportionately large compared to its body.
Coloration
Its overall dark brown to black body coloration is consistent, though some individuals may show subtle patterns.
Barbels
Presence of four pairs of long, prominent barbels around the mouth.
Body Shape
An elongated, somewhat compressed body, typical of many bagrid catfishes.
Habitat
- Water type
- freshwater
- Depth
- Typically found in shallow to moderate depths, often near the bottom.
- Environment
- Slow-moving rivers, streams, canals, and floodplains. Prefers areas with dense aquatic vegetation, submerged roots, leaf litter, and driftwood, which provide cover and foraging opportunities. Often found in blackwater environments.
- Geographic range
- Southeast Asia, specifically in the Mekong River basin (Thailand, Laos, Cambodia, Vietnam) and potentially other river systems in the region, such as the Chao Phraya basin.
Aquarium Information
- Care level: intermediate
- Temperament: semi-aggressive
- Diet: omnivore
- Minimum tank size: 150 gallons (570 liters)
- Temperature: 75-82°F (24-28°C)
- pH level: 6.0-7.5
- Hardness: 2-15 dGH
- Compatibility: Generally peaceful with fish too large to be considered food. Can be territorial with other Bagrichthys species or similar-looking bottom dwellers. Best kept singly or in a very large tank with multiple individuals to disperse aggression.
- Special requirements: Requires a well-established aquarium with plenty of hiding spots (caves, driftwood, dense planting). Subdued lighting is preferred as they are nocturnal. A soft substrate is beneficial to protect their delicate barbels. Excellent filtration and regular water changes are crucial due to their size and bioload.
Wild Information
- Conservation status: least concern
- Seasonality: Breeding patterns in the wild are not well-documented, but they are likely influenced by seasonal rainfall and water levels in their natural habitats.
- Market price: Moderate to high for aquarium trade specimens, depending on size and availability.
- Commercial importance: low
- Taste: Not commonly consumed; information on taste is scarce.
- Texture: Likely firm, similar to other catfish species.
- Cooking methods: Unknown
- Nutritional value: Not typically a food fish; nutritional value information is not readily available.
Key Facts
Sail-like Fininteresting
The Black Lancer Catfish is named for its remarkably tall, sail-like dorsal fin, which can be almost as tall as its body depth.
Nocturnal Hunterbehavior
These catfish are primarily nocturnal, using their sensitive barbels to locate food in the dark or murky waters of their habitat.
Venomous Spinesinteresting
Like many catfish, Bagrichthys hypselopterus possesses venomous spines in its dorsal and pectoral fins, which serve as a defense mechanism against predators.
Blackwater Specialistbehavior
They are often found in blackwater environments, characterized by low pH and high tannin content from decaying organic matter.
Safety Information
Handle with care- Safety level: caution
- Venomous: Yes
- Edibility: not recommended
- Handling notes: The pectoral and dorsal fins possess sharp, serrated spines that can inflict a painful wound. These spines are known to be venomous, causing localized pain, swelling, and discomfort. Handle with extreme care, using thick gloves or a net to avoid direct contact with the spines. If stung, clean the wound thoroughly and seek medical attention if symptoms are severe or persistent.
Similar Species
False Black Lancer Catfish
Bagrichthys macracanthus
While also having a tall dorsal fin, B. macracanthus typically has a less extreme dorsal fin height relative to its body length and may exhibit more pronounced banding or spotting patterns. The body shape can also be slightly more robust.
Other Bagrichthys species
Various
Other species within the genus Bagrichthys (e.g., B. majusculus, B. vaillantii) generally have less developed dorsal fins and may differ in coloration and body proportions. Careful examination of fin ray counts and body measurements is often required for definitive identification among closely related species.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Siluriformes
- Family
- Bagridae
- Genus
- Bagrichthys
- Species
- hypselopterus
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