The Roseline Shark (Sahyadria denisonii), also known as the Denison Barb or Red-Line Torpedo Barb, is a vibrant, fast-swimming freshwater fish prized for its brilliant red stripe, torpedo-shaped body, and energetic schooling behavior. Native to the fast-flowing rivers and streams of India’s Western Ghats, this species is highly sought after for large, well-maintained community aquariums.
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A Name That Reflects Its Appearance
The “Roseline” name comes from the bold red stripe that runs from its nose through its eye, contrasting beautifully with its silver body, black lateral stripe, and yellow-tipped tail fin. This striking coloration becomes more intense with proper diet, good water quality, and a spacious environment.
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Growth and Tank Requirements
Roseline Sharks grow to a maximum size of 4.5-6 inches, requiring a minimum tank size of 55 gallons, though 75+ gallons is preferred for larger groups. They thrive in long, well-oxygenated tanks with strong water flow, mimicking their natural riverine habitat. A well-planted aquarium with open swimming space, smooth rocks, and driftwood provides both comfort and aesthetics.
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Care and Water Parameters
These fish prefer cooler, highly oxygenated water, with:
Temperature: 65-78°F
pH Range: 6.5-7.8
Water Hardness: Soft to moderately hard
Due to their active nature, they require efficient filtration and regular water changes to maintain pristine conditions. Adding a powerhead or air stone can help simulate the strong currents of their natural habitat.
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Diet and Feeding
Roseline Sharks are omnivores, requiring a varied diet to enhance their vibrant coloration and overall health. Their diet should include:
High-quality sinking pellets and flakes
Live or frozen foods such as bloodworms, brine shrimp, and daphnia
Vegetable-based foods like spirulina flakes and blanched zucchini
Occasional treats like mysis shrimp for added protein
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Unique Behaviors
Roseline Sharks are peaceful but highly active schooling fish, best kept in groups of at least 5-6 individuals. When housed in too small of a group, they may become shy or stressed, leading to faded coloration and erratic behavior. They are excellent tank mates for other fast-moving, peaceful fish, such as rainbowfish, larger tetras, and loaches.
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Important Considerations
Although stunning, Roseline Sharks require a large, well-maintained aquarium with strong filtration and plenty of swimming space. They are not suitable for small tanks and should be kept in groups to ensure a healthy, active, and stress-free environment.
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Please note that these are general guidelines, and for more accurate values, we encourage you to contact Living Aquarium by phone or in person. Within store hours, our team of experts are always happy to answer any questions you may have and provide personalized guidance on care.