Redfin Dwarf Rasbora: Species Profile

The Redfin Dwarf Rasbora (Boraras brigittae), commonly known as the Mosquito Rasbora, is a diminutive freshwater fish celebrated for its vibrant red coloration and peaceful demeanor. Originating from the blackwater streams and peat swamps of Borneo and Sumatra, this species is a favored choice among aquarists, particularly for nano and planted aquariums.

Species Overview

• Common Names: Redfin Dwarf Rasbora, Mosquito Rasbora
• Scientific Name: Boraras brigittae
• Adult Size: Approximately 0.8 inches (2 cm)
• Life Expectancy: 3 to 5 years

Characteristics

• Family: Cyprinidae
• Origin: Borneo and Sumatra, Indonesia
• Social: Peaceful, schooling
• Tank Level: Midwater
• Minimum Tank Size: 5 gallons
• Diet: Omnivore
• Breeding: Egglayer; moderately challenging in captivity
• Care Level: Beginner
• pH: 4.0 to 7.0
• Hardness: 1 to 5 dGH
• Temperature: 72–79°F (22–26°C)

Origin and Distribution

Redfin Dwarf Rasboras are indigenous to the slow-moving, tannin-rich blackwater habitats of Borneo and Sumatra. They thrive in environments with dense vegetation and soft, acidic water conditions, often found in areas shaded by overhanging foliage.

Colors and Markings

This species boasts a striking red body adorned with a prominent black stripe running laterally from the snout to the base of the tail. The fins are typically translucent with red hues, and males often exhibit more intense coloration compared to females.

Tankmates

Redfin Dwarf Rasboras are peaceful and do well in community tanks with other non-aggressive, similarly sized species. Suitable tankmates include:

• Other small rasboras
• Microdevario species
• Pygmy Corydoras
• Dwarf shrimp

It’s advisable to avoid housing them with larger, aggressive fish or species that may outcompete them for food.

Habitat and Care

To replicate their natural habitat:

• Tank Setup: Provide a well-planted aquarium with ample hiding spots. Incorporate fine-leaved plants, driftwood, and leaf litter to mimic their natural environment and create shaded areas.
• Water Parameters: Maintain soft, acidic water conditions within the recommended pH and hardness ranges. Regular water changes are essential to keep the environment clean and stable.
• Lighting: Subdued lighting is preferred, which can be achieved with floating plants to diffuse light and simulate their natural shaded habitat.

Diet and Feeding

Redfin Dwarf Rasboras are omnivorous and thrive on a varied diet:

• High-quality micro-pellets or flake food
• Live or frozen foods such as daphnia, baby brine shrimp, and micro-worms
• Occasional vegetable matter like finely chopped spinach

Feed them small portions multiple times daily, ensuring they consume the food within a few minutes to prevent overfeeding and maintain water quality.

Gender Differences

Males are generally more colorful with a slimmer body, while females have a rounder abdomen, especially when carrying eggs.

Breeding

Breeding Redfin Dwarf Rasboras in captivity is moderately challenging:

• Breeding Tank: Set up a separate tank with fine-leaved plants or spawning mops. Maintain slightly acidic water with a temperature around 78°F (26°C).
• Spawning: Introduce a conditioned male and female pair. Spawning typically occurs in the early morning, with the female scattering eggs that the male fertilizes.
• Raising Fry: After spawning, remove the adults to prevent them from eating the eggs. Eggs hatch within 24–36 hours, and fry can be fed infusoria or commercially prepared fry food until they are large enough to accept standard foods.

Further Research

For those interested in similar species, consider exploring:

• Chili Rasbora (Boraras brigittae)
• Dwarf Rasbora (Boraras maculatus)
• Phoenix Rasbora (Boraras merah)

These species share comparable care requirements and can coexist harmoniously in a community aquarium.

FAQ

• How many Redfin Dwarf Rasboras should be kept together? It’s best to keep them in groups of at least six to promote natural schooling behavior and reduce stress.
• Are Redfin Dwarf Rasboras suitable for beginners? Yes, their hardy nature and ease of care make them excellent choices for novice aquarists.
• Can Redfin Dwarf Rasboras live with other fish? Yes, they can coexist with other peaceful, similarly sized fish. However, avoid housing them with larger or aggressive species to prevent potential conflicts.

By providing appropriate care and a suitable environment, Redfin Dwarf Rasboras can be a lively and colorful addition to any freshwater aquarium.