Emerald Dwarf Rasbora: Fish Species Profile

Species Overview

The Emerald Dwarf Rasbora (Danio erythromicron), also known as the Emerald Dwarf Danio, is a small, vibrant freshwater fish native to Myanmar’s Lake Inle. Its striking coloration and peaceful demeanor make it a popular choice among aquarists.

• Common Names: Emerald Dwarf Rasbora, Emerald Dwarf Danio
• Scientific Name: Danio erythromicron
• Adult Size: Up to 1 inch (2.5 cm)
• Life Expectancy: 3–5 years

Characteristics

• Family: Cyprinidae
• Origin: Lake Inle, Myanmar
• Social: Peaceful schooling fish
• Tank Level: Mid to upper water levels
• Minimum Tank Size: 10 gallons
• Diet: Omnivore
• Breeding: Egg layer
• Care Level: Easy
• pH: 7.0–8.0
• Hardness: 2–10 dKH
• Temperature: 70–75°F (21–24°C)

Origin and Distribution

Emerald Dwarf Rasboras are endemic to Lake Inle in Myanmar, a high-altitude lake characterized by clear, slightly alkaline waters. They inhabit densely vegetated areas along the lake’s edges, thriving in environments rich in aquatic plants.

Colors and Markings

These fish feature a light pink to orange body adorned with shimmering emerald green stripes that run horizontally. A distinctive black spot near the base of the tail adds to their unique appearance. Males typically exhibit more vibrant colors and reddish-orange fins, while females have more subdued hues and transparent fins.

Tankmates

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

• Celestial Pearl Danios
• Harlequin Rasboras
• Small Tetras
• Corydoras Catfish
• Cherry Shrimp

Avoid housing them with larger or aggressive fish that may view them as prey.

Habitat and Care

To replicate their natural habitat:

• Tank Size: A minimum of 10 gallons is recommended, though a 20-gallon tank allows for a larger school and more stable water conditions.
• Substrate: Use dark-colored, fine sand to mimic the lakebed and enhance their colors.
• Plants: Incorporate dense vegetation with live plants like Java Moss, Anubias, and floating species to provide hiding spots and a sense of security.
• Lighting: Subdued lighting conditions are preferred to simulate their natural environment.
• Filtration: Employ a gentle filtration system to maintain water quality without creating strong currents.

Regular water changes and monitoring of water parameters are essential to keep them healthy.

Diet and Feeding

Emerald Dwarf Rasboras are omnivores with a preference for protein-rich foods. In the aquarium, they readily accept:

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

Feed them small amounts 2–3 times daily, ensuring they consume all the food within a few minutes.

Gender Differences

Males are generally more colorful, displaying brighter hues and reddish-orange fins. Females tend to be slightly larger with rounder bellies, especially when carrying eggs, and have more transparent fins.

Breeding

Breeding Emerald Dwarf Rasboras in captivity is feasible with proper conditions:

• Breeding Tank: Set up a separate tank with similar water parameters, dense planting, and fine-leaved plants or spawning mops.
• Conditioning: Feed breeding pairs a high-protein diet of live and frozen foods to encourage spawning.
• Spawning: Females scatter eggs among plants, which males then fertilize.
• Post-Spawning: Remove adults after spawning to prevent them from eating the eggs.

Eggs typically hatch within 72 hours, and fry become free-swimming a few days later. Feed fry infusoria or commercially available fry food until they are large enough to accept baby brine shrimp.

Further Research

For more information on similar species and care techniques, consider exploring:

• Celestial Pearl Danio
• Harlequin Rasbora
• Microrasbora species

FAQ

How many Emerald Dwarf Rasboras should I keep together?
It’s best to keep them in groups of at least 6–8 individuals, as they are schooling fish and feel more secure in numbers.

Are Emerald Dwarf Rasboras suitable for beginners?
Yes, their hardy nature and peaceful temperament make them suitable for novice aquarists who can maintain stable water conditions.

What is the ideal tank setup for Emerald Dwarf Rasboras?
A well-planted tank with subdued lighting, gentle filtration, and a dark substrate closely mimics their natural habitat and helps them thrive.

This profile provides essential information for successfully keeping and enjoying Emerald Dwarf Rasboras in your aquarium.