Mascara Barb

The Mascara Barb (Dawkinsia assimilis), also known as the Mascara Torch Barb or Mascara Flash Barb, is a striking species of barb native to freshwater streams and rivers in India and Sri Lanka. It gets its name from the distinctive black markings around its eyes, resembling mascara. Known for its vibrant colors and active nature, the Mascara Barb is a popular choice for aquarists who appreciate schooling fish with lively behavior and striking visual appeal.

Physical Characteristics:

• Size: Mascara Barbs grow to about 12-15 cm (4.7-6 inches) in length, making them medium-sized barbs suitable for larger aquariums.
• Coloration:
  • Body: The body of the Mascara Barb is elongated and slightly compressed, typically silver or golden in color. Males are more colorful than females, displaying bright red, orange, or yellow on the fins and a metallic sheen on their body.
  • Eyes: The most distinctive feature is the black "mascara" markings around the eyes, which give the fish its common name. This unique marking is more pronounced in males.
  • Fins: The dorsal and caudal fins are often tipped with bright red or orange, adding to their striking appearance, particularly during mating season when the colors intensify.
• Shape: The body is torpedo-shaped, which allows them to swim swiftly and display agile movements in the tank.

Behavior:

• Temperament: Mascara Barbs are peaceful schooling fish that should be kept in groups of 6 or more to feel secure and exhibit natural behavior. In a school, they are less likely to become stressed or aggressive.
• Activity Level: They are active swimmers and constantly on the move, especially in the middle levels of the tank. Their lively nature makes them a great addition to large community tanks with plenty of open swimming space.
• Social Behavior: These fish are social and thrive in a community setting. They are not aggressive toward other species but may compete for food if housed with slow-feeding or timid tankmates.

Aquarium Care:

• Tank Size: A tank of at least 200 liters (50 gallons) is recommended for a school of Mascara Barbs. Larger tanks provide more swimming space, which these active fish require.
• Water Parameters:
  • Temperature: Mascara Barbs thrive in warm water, with an ideal temperature range of 22°C to 26°C (72°F to 79°F).
  • pH: They prefer slightly acidic to neutral water, with a pH range of 6.0 to 7.5.
  • Hardness: Soft to moderately hard water, with a general hardness (GH) of 4-12 dGH.
• Tank Setup:
  • Substrate and Decorations: A soft, sandy substrate is ideal for these fish. While they appreciate plants, use sturdy species such as Anubias, Java fern, or Vallisneria, as Mascara Barbs may nibble on softer plants. Adding driftwood and rocks creates a more natural habitat, but ensure there is ample open space for swimming.
  • Lighting: Moderate lighting is recommended to bring out their vibrant colors without causing stress. Floating plants can help diffuse the light and provide some shaded areas.
• Filtration: A strong filtration system is necessary to maintain water quality, as Mascara Barbs are active fish that produce a moderate amount of waste. Ensure the water flow mimics the gentle current of their natural habitat.

Diet:

Mascara Barbs are omnivores and enjoy a varied diet that helps maintain their health and vibrant colors. Their diet should include:

• Pellets or Flakes: High-quality tropical fish flakes or pellets should form the staple of their diet.
• Live or Frozen Foods: They enjoy live or frozen foods such as brine shrimp, bloodworms, and daphnia, which provide essential protein and promote their vibrant colors.
• Vegetable Matter: Offer plant-based foods such as spirulina flakes, blanched spinach, or zucchini to ensure a balanced diet. These foods also help prevent them from nibbling on live plants in the tank.

Feed them 2-3 times daily, ensuring all food is consumed within a few minutes to prevent overfeeding and maintain water quality.

Tankmates:

Mascara Barbs are peaceful and make excellent tankmates for other community fish with similar water requirements. Suitable tankmates include:

• Tetras: Larger tetras such as Rummy Nose Tetras or Black Skirt Tetras.
• Rasboras: Species like Harlequin Rasboras are great companions.
• Corydoras catfish: These peaceful bottom-dwellers coexist well with Mascara Barbs.
• Other barbs: Similar-sized barbs such as Rosy Barbs or Black Ruby Barbs.
• Gouramis: Peaceful gouramis can also make good tankmates.

Avoid keeping them with overly aggressive or fin-nipping species, as this can cause stress or injury to the Mascara Barbs.

Breeding:

Breeding Mascara Barbs in captivity is possible but can be challenging due to their specific requirements.

• Breeding Setup: A separate breeding tank with soft, slightly acidic water (pH around 6.5) and a temperature of 25°C (77°F) is ideal. Provide fine-leaved plants or a spawning mop for the female to scatter her eggs.
• Spawning Behavior: Males will display brighter colors during the breeding season, showing off their red or orange fins. The female will lay her eggs on plants or substrate, and the male will fertilize them.
• Egg Care: Mascara Barbs do not provide parental care and may eat the eggs, so it’s best to remove the adults after spawning. The eggs will hatch within 2-3 days, and the fry become free-swimming a few days later.
• Fry Care: The fry can be fed infusoria or finely crushed flake food until they are large enough to eat larger foods.

Special Considerations:

• Space Requirements: Due to their active nature, Mascara Barbs need plenty of swimming space. Keeping them in undersized tanks can lead to stress and health problems.
• Water Quality: These fish are sensitive to poor water quality, so regular water changes (at least 25% weekly) and maintaining stable water parameters are essential for their health.