Sicklefin Barb (Puntioplites falcifer)

Sicklefin Barb — Puntioplites falcifer

High-current strength with bold fin profile

The Sicklefin Barb is a powerful Southeast Asian river fish recognized for its tall, sharply curved dorsal fin and thick, torpedo-shaped body. Its silver-to-bronze base reflects light cleanly, while subtle darker edging along the fins enhances the “sickle” silhouette that gives this species its name. Built for endurance rather than flash, this barb brings movement and river energy to large aquariums.

Native to fast-flowing river systems in Thailand and surrounding regions, Puntioplites falcifer thrives in oxygen-rich water with steady current. It is a constant cruiser, preferring open swimming lanes where it can display its athletic build. When kept in groups, they move with coordinated strength, transforming large tanks into active river scenes.

Growing to 12–16+ inches, the Sicklefin Barb becomes a substantial schooling fish best suited for large aquariums or indoor pond systems.

Aquarium Setup

• Minimum Tank Size: 180–240 gallons (6 ft+ length recommended)

• Group Size: 4 or more preferred

• Substrate: Sand, smooth gravel, or river rock

• Flow: Moderate to strong current

• Décor: Open swimming lanes with rock and wood structure along edges

• Lighting: Moderate to bright

• Filtration: Strong biological filtration required

• Oxygen: High dissolved oxygen essential

Tank Mates

Best with other large, fast, confident species:

• Large barbs

• Datnoids

• Arowana (space dependent)

• Large catfish

• Robust riverine fish

Avoid small or slow, delicate species.

Water Parameters

• Temperature: 72–78°F (22–26°C)

• pH: 6.5–7.5

• Hardness: Moderate

• Water Quality: Clean, stable, and well-oxygenated

Diet

Omnivorous:

• High-quality large pellets

• Vegetable matter (lettuce, spinach)

• Shrimp and protein foods in moderation