The Harlequin Lancer Catfish is a striking and rare predator, instantly recognizable by its bold black-and-gold banding and elongated, streamlined body built for speed. Native to the fast-flowing rivers and streams of Southeast Asia (particularly Thailand, Malaysia, and Indonesia), this species is a member of the Bagridae family and is a powerful, active hunter in its natural habitat.
With their sharp patterns, active swimming, and impressive size potential, Harlequin Lancers are sought after by serious catfish enthusiasts — though their predatory nature makes them unsuitable for small community tanks.
🌊 Tank Setup
🍽️ Diet
⚖️ Temperament
🧠 Behavior & Care
| 🔖 Scientific Name | Bagroides melapterus |
|---|---|
| 🐟 Common Name | Harlequin Lancer Catfish |
| 🌎 Origin | Southeast Asia |
| 📏 Size | 16–20" (40–50 cm) |
| 🌡️ Temperature | 75–82°F (24–28°C) |
| 💧 pH Range | 6.5–7.5 |
| 🐟 Temperament | Predatory |
| 🏠 Tank Size | 125+ gallons |
| 🍽️ Diet | Carnivore |
| 🎯 Experience | Advanced |
💡 The Harlequin Lancer is a showpiece predator for large aquariums, combining speed, power, and eye-catching coloration — but requires a big tank, strong current, and tankmates that can’t be swallowed.











