Roseline Shark (Denison Barb) Care Guide

Colorful, Fast-Swimming, and Full of Personality

The Roseline Shark (Sahyadria denisonii), also known as the Denison Barb or Red-Line Torpedo Barb, is a striking freshwater fish prized for its torpedo-shaped body, shimmering silver coloration, and the signature red line that runs from its snout through its eyes. Known for their peaceful schooling behavior and bursts of energetic swimming, Roseline Sharks are a favorite centerpiece in well-planted community aquariums.

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Quick Facts:

• Scientific Name: Sahyadria denisonii

• Common Names: Roseline Shark, Denison Barb, Red-Line Torpedo Barb

• Origin: Western Ghats, India

• Adult Size: 5–6 inches

• Temperament: Peaceful, schooling

• Lifespan: 5–8 years

• Minimum Tank Size: 55 gallons

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Appearance:

Roseline Sharks are among the most visually appealing freshwater species available. They feature:

• A bold red stripe running laterally from the nose to mid-body

• A black line beneath the red that extends toward the tail

• A yellow and black pattern on the tail fin

• Occasional flashes of green or gold, especially in good lighting

Their sleek, hydrodynamic shape and active nature make them look like miniature aquatic missiles zipping around the tank.

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Behavior:

Despite the name "shark," the Roseline Shark is a peaceful community fish. They are highly social and thrive best when kept in groups of at least 5 or more. In small numbers, they may become shy or stressed. When properly kept, they school actively and bring movement and life to mid and upper tank levels.

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Tank Setup:

• Tank Size: 55+ gallons recommended for a small group

• Aquascaping: Well-planted tanks with driftwood and rocks for hiding and resting

• Swimming Space: Open areas for free swimming are a must

• Lighting: Moderate to bright lighting enhances their coloration

• Cover: Secure lids are recommended—they may jump when startled

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Water Parameters:

• Temperature: 72–79°F

• pH: 6.5–7.5

• Hardness: Soft to moderately hard water

• Filtration: Strong filtration with good water flow to mimic their riverine habitat

? Clean, well-oxygenated water is key to keeping them healthy and vibrant.

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Diet:

Roseline Sharks are omnivores and not picky eaters. Their diet should be balanced and varied to maintain their bright coloration.

Feeding Suggestions:

• High-quality flakes or micro pellets

• Frozen or live foods: bloodworms, brine shrimp, daphnia

• Blanched vegetables: zucchini, spinach, peas

• Occasional algae wafers or spirulina-based foods

Feed small portions 1–2 times daily, ensuring all food is consumed within a few minutes.

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Tank Mates:

Roseline Sharks do well in peaceful community tanks. Ideal tank mates include:

• Tetras, rasboras, rainbowfish

• Corydoras and other peaceful bottom dwellers

• Gouramis, angelfish (with caution), livebearers

• Avoid aggressive species or fin-nippers

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Why Choose a Roseline Shark?

✅ Striking coloration and torpedo-shaped beauty
✅ Peaceful and perfect for planted aquascapes
✅ Schooling behavior adds natural, active motion
✅ Easy to feed and relatively hardy

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Conservation Note:

Roseline Sharks are endangered in the wild due to habitat destruction and overcollection. Thankfully, most available in the aquarium trade today are captive-bred. Always buy from reputable sources that support sustainable breeding practices.

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Final Thoughts:

If you’re looking to add color, energy, and elegance to your freshwater setup, the Roseline Shark is a brilliant choice. With proper care, they’ll thrive for years and become one of the most eye-catching additions to your tank.