Celestial Pearl Danio

Also known as: Danio margaritatus

The Celestial Pearl Danio (Danio margaritatus) is a small, vibrantly colored freshwater fish native to shallow, vegetated ponds and slow-moving streams in Myanmar. The Celestial Pearl Danio originates from Myanmar, specifically in the Salween River basin near Hopong and Taunggyi in Shan State, reaches 2.5 cm in captivity, typically lives 3, and is kept at 22C (72F). Individual fish vary, so treat this as a general guide rather than a guarantee.

Species at a glance

Origin: Myanmar, specifically in the Salween River basin near Hopong and Taunggyi in Shan State
Adult size: 2.5 cm (1.0 in)
Life span: 3
Temperament: Peaceful and active schooling fish; best kept in groups of 6 or more
Tank size: 40 L (10 gal)
Water temp: 22C (72F)
pH range: pH 6.5-7.5
Diet: Omnivorous; accepts high-quality micro pellets, crushed flakes, and live/frozen foods such as daphnia, brine shrimp, and microworms
Other names: Danio margaritatus

About the Celestial Pearl Danio

The Celestial Pearl Danio (Danio margaritatus) is a small, vibrantly colored freshwater fish native to shallow, vegetated ponds and slow-moving streams in Myanmar. Discovered in 2006, it quickly gained popularity in the aquarium trade for its striking pearl-like spots and red fin markings. Males display more intense coloration, especially during breeding, while females are slightly rounder and less vivid. Despite its delicate appearance, it is hardy when kept in stable, well-maintained conditions.

Lifespan and health

Under ideal conditions, Celestial Pearl Danios typically live 3 to 5 years, with some individuals reaching up to 5 years in well-maintained, low-stress environments. Lifespan is strongly influenced by water quality, diet, and social grouping; keeping them in groups of 8-10 reduces aggression and stress, promoting longevity. Avoid overcrowding and sudden parameter shifts, which can shorten their lifespan significantly. Common health issues include bacterial infections (such as fin rot) and parasitic infestations (like ich or velvet), often triggered by poor water quality or stress from incompatible tankmates. Signs include clamped fins, lethargy, loss of color, or white spots. Quarantine new fish for 2-4 weeks and maintain nitrate levels below 20 ppm to prevent outbreaks. Treat early with appropriate medications and improve water conditions promptly.

Overview

Care and tank setup

For optimal care, maintain a tank of at least 40 liters (10 gallons) with a sandy or fine gravel substrate and dense planting using species like Java moss, Anubias, or Cryptocoryne to mimic its natural habitat. Provide gentle filtration and moderate lighting; avoid strong currents as these fish prefer calm water. Include driftwood and leaf litter to release tannins and lower pH slightly, which enhances coloration and reduces stress. Water parameters should be kept stable: temperature between 22-26°C (72-79°F), pH 6.5-7.5, and hardness soft to moderately soft (2-10 dGH). Perform weekly water changes of 25% to maintain low nitrate levels (<20 ppm). Use a tight-fitting lid as they are known to jump when startled. Feed small amounts 2-3 times daily with a varied diet: high-quality micro pellets as a staple, supplemented 2-3 times weekly with live or frozen foods like baby brine shrimp or daphnia. Avoid overfeeding; offer only what they can consume in 2-3 minutes. Their small mouths require appropriately sized food.

Adding a Celestial Pearl Danio? Research the species’ adult size and temperament carefully, quarantine new fish before introducing them to your tank, and buy from reputable aquarium stores or breeders.

Breed information on this page is based on the Wikipedia article on the Celestial Pearl Danio, supplemented with additional research. Reviewed for accuracy.