Denison Barb

The Denison Barb, also known as the Roseline Shark or Red Line Torpedo Barb, is one of the most stunning freshwater aquarium fish available. Native to fast-flowing streams in India, these fish feature a brilliant red stripe running from their snout through their eye to the middle of their body, contrasted by a black stripe below it and gold accents on their dorsal fin. Their torpedo-shaped body is built for speed and they are constantly on the move. Discovered relatively recently by the aquarium trade in the 1990s, they quickly became highly sought after. However, their wild populations have been severely impacted by over-collection, making captive-bred specimens more desirable and sustainable. Their active nature, striking appearance, and peaceful temperament make them an excellent choice for larger community tanks with adequate space and water flow.

Care Requirements

Tank Setup

Denison Barbs need a long, spacious tank with excellent water flow to mimic their natural fast-moving stream habitat. A 55-gallon tank is the minimum, with 75 gallons or larger preferred for a school. Provide smooth rocks, driftwood, and robust plants that can withstand the current. Strong filtration and powerheads to create water movement are essential for their well-being.

Water Quality

• Temperature: 72-77°F (22-25°C)
• pH: 6.8-7.8
• Water Hardness: Moderate, 5-12 dGH
• Ammonia/Nitrite: 0 ppm
• Nitrate: <20 ppm

Feeding

These omnivores are not picky eaters and accept high-quality flakes, pellets, and various frozen or live foods. They particularly enjoy bloodworms, brine shrimp, and daphnia. Offer a varied diet to maintain their brilliant coloration. Feed small portions 2-3 times daily as their high activity level requires frequent nourishment.

Behavior & Compatibility

Denison Barbs are active, schooling fish that should be kept in groups of 6 or more. They are peaceful but their constant motion means they can stress very slow-moving or timid fish. They make excellent tank mates for other active species like rainbowfish, larger tetras, and peaceful cichlids. Avoid fin-nipping species that might target their flowing fins.

Tips for Success

• Always purchase captive-bred specimens to support conservation efforts
• Maintain strong water flow and high oxygen levels with powerheads or spray bars
• Keep in schools of 6+; larger groups show better coloration and less skittishness
• Provide open swimming space with some visual barriers using rocks or driftwood
• Their colors fade under stress or poor water conditions; pristine water is essential
• Regular water changes help maintain the clean, well-oxygenated water they require