Common Name: Harlequin Marble Lancer Catfish
Scientific Name: Bagroides melapterus
Other Names: Harlequin Catfish, Marble Lancer
The Harlequin Marble Lancer Catfish is a striking and somewhat rare freshwater fish known for its marbled pattern and elongated body. This species is sought after by catfish enthusiasts for its unique appearance and active behavior.
Habitat and Distribution:
The Harlequin Marble Lancer Catfish is native to the fast-flowing rivers and streams of Southeast Asia, particularly in countries such as Thailand, Malaysia, and Indonesia. These fish inhabit clear, rocky streams and rivers with strong currents and plenty of hiding spots among rocks and submerged wood.
Size and Lifespan:
In both the wild and captivity, Harlequin Marble Lancer Catfish can grow up to 12-14 inches (30-35 cm) in length. With proper care, their lifespan can range from 8 to 12 years, depending on the quality of their diet and water conditions.
Diet and Behavior:
Harlequin Marble Lancer Catfish are carnivorous, feeding primarily on small fish, crustaceans, and insects in their natural habitat. In an aquarium, their diet should include high-quality carnivorous pellets, live or frozen foods such as bloodworms, brine shrimp, and small pieces of fish or shrimp. These catfish are known for their active and somewhat aggressive behavior, especially during feeding times. They are generally nocturnal and prefer to hide during the day, becoming more active at night.
Breeding and Reproduction:
Breeding Harlequin Marble Lancer Catfish in captivity is rare and not well-documented. They are believed to be egg scatterers, with spawning typically occurring during the rainy season in the wild. To encourage breeding, provide a large, well-maintained tank with plenty of hiding spots and simulate seasonal changes. Successful breeding likely requires specific environmental conditions, including strong water flow and slightly acidic to neutral water.
Aquarium Care and Tank Requirements:
Due to their size and active nature, Harlequin Marble Lancer Catfish require a large aquarium, with a minimum of 100 gallons recommended for adult specimens. The tank should have a soft, sandy or fine gravel substrate to prevent injury and should be equipped with strong water flow to mimic their natural habitat. Include plenty of rocks, driftwood, and caves to provide hiding spots and reduce stress. Efficient filtration and regular water changes are essential to maintaining water quality. The water temperature should be kept between 75-82°F (24-28°C), with a pH of 6.0-7.5 and soft to moderately hard water.
Ideal Tank Mates:
Harlequin Marble Lancer Catfish can be kept with other large, robust fish that share similar water parameter requirements. Suitable tank mates include large cichlids, other large catfish, and similarly sized fish. Avoid housing them with small or delicate species that may become targets of predation.
Difficulty Level:
Advanced. Keeping Harlequin Marble Lancer Catfish requires a deep understanding of their needs, including their large size, predatory behavior, and specific water quality requirements. They are best suited for experienced aquarists with the space and resources to provide proper care.
Water Parameters:
• Temperature: 75-82°F (24-28°C)
• pH: 6.0-7.5
• General Hardness (GH): 4-15 dGH
• Carbonate Hardness (KH): 2-8 dKH
• Ammonia: 0 ppm (ideal)
• Nitrite: 0 ppm (ideal)
• Nitrate: <20 ppm (ideal)
Additional Information:
• The Harlequin Marble Lancer Catfish’s unique marbled pattern and elongated body make it a visually appealing addition to any large aquarium.
• They are known for their nocturnal behavior and are most active at night, so providing hiding spots is essential for their well-being.
• Fun fact: This species is named “Lancer” due to its sleek, lance-like body shape, which allows it to navigate fast-moving waters with ease.
