Celestial Pearl Danio Ultimate Guide

Celestial Pearl Danio

Celestial Pearl Danio Main Facts

Danio margaritatus

galaxy rasbora, Microrasbora sp. ‘Galaxy’

Phylum: Chordata
Class: Actinopterygii
Order: Cypriniformes
Family: Cyprinidae
Genus: Danioninae
Species: Danio

They can grow up to 2.5 inches but on average most of them only reach 2 inches.

Males have a bright-blue background color

Females have a dull blue-green

The fins are brightly colored

Celestial Pearl Danio are calm and very undemanding. Under optimal aquarium conditions, you will enjoy having them in the aquarium.

The celestial pearl danio does not have a specific spawning season. The females do not lay eggs continuously.

The females produce small batches of around 30 eggs per spawning episode which they then hide away in vegetation. That is why males will defend a patch of vegetation.

22-24 °C (73 – 79 °F)

6.5 to 7.5

approx. 5 – 20°dH

Are you new to aquariums? Or do you just want to add a pretty, colorful and peaceful fish to your community fish tank? Then think about the Celestial Pearl Danio

Celestial Pearl Danio are:

Better still, the Celestial Pearl Danio will thrive in a smaller 20 gallon tank and reproduce in captivity.

Celestial Pearl Danio Distribution and Native Habitat

The Celestial Pearl Danio is native to Myanmar. The general location is near the city of Hopong not far from Taungyi, capital of Southern Shan State. This is a mountainous region where the elevation ranges from just over a half mile to nearly a mile above sea level.

They come from clearly fast moving streams and rivers in Myanmar (formerly Burma), Thailand and Sumatra.

Celestial Pearl Danio

It flourishes at an an altitude of over 1,000 m (3,400 ft). Its native habitat is part of the Salween basin, namely the Nam Lang and Nam Pawn Rivers

Celestial Pearl Danio Physiology and Color

Celestial Pearl Danio Physiology

The main physiological characteristics of the Celestial Pearl Danio:

Celestial Pearl Danio males

  • They are a deep midnight blue, with a series of pearlescent spots over their flanks, sometimes arranged in rows
  • They have unpaired fins have bright red stripes outlined in midnight blue
  • Their ventral fins are solid red, or are filled with red splotches or spots
  • They show a bright red belly with rare males spotting a red stripe on their backs that runs from the top of the head to just before the dorsal fin

Celestial Pearl Danio females

  • Overall, female Celestial Pearl Danio are taller and fuller than their male counterparts.
  • They are a bit more washed out, with more of an overall golden blue sheen.
  • Their pearlescent spots are not as bright
  • The red in the fins is more of a faded orange.
  • Their ventral fins are clear but rare females spot an orange color in the belly
  • They develop a dark spot just in front of the anal fin when they are ready to spawn, and the area swells up a bit

Celestial Pearl Danio Color

If you’ve seen a Pearl Danio, you’ll know the dazzling colors it’s named after, making it one of the most attractive freshwater fish.

  • Its mother-of-pearl blue-violet-colored body is emphasized by an orange-red stripe that runs from the tail to the center.
  • Males are smaller, slimmer and more colorful and often show a red hue on the ventral aspect.
  • A yellow ocher color variant known as ‘Yellow Danio’ is available in some locations.
  • Its iridescent colors make it unusually attractive and provide a backdrop for eye-catching species
Celestial Pearl Danio in an Aquarium

Celestial Pearl Danio as Tank mates

Celestial Pearl Danio are ideal for community aquariums and get along well with peaceful fish.

They are tolerant of a variety of water conditions, which is why they are also suitable for combination with a variety of other fish.

As school fish, they should be kept in groups of at least four, preferably more. Male display their best colors when at least one female is present.

Even though the Celestial Pearl Danio are peaceful and harmless, you should avoid adding them to a tank with aggressive fish. The ideal tank makes for the Danios are:

  • Neons;
  • Guppy;
  • Cardinals;
  • Cherry barbs

When the Danios are in the same aquarium with the above listed species, they no longer hide and begin to swim throughout the body of water to form a flock with other fish.

Avoid adding shrimps to the aquarium. The fact is that Celestial Pearl Danio beauties feed on small shrimps.

Celestial Pearl Danio Care

The natural habitat for Celestial Pearl Danio is fast flowing streams and rivers (like their origin in Burma, Thailand and Sumatra). They are therefore used to strong water currents and a large swimming area.

Aquarium Requirements

  • Since they require slightly higher oxygen content than other Danios, having a good filtration in the aquarium is very important
  • Celestial Pearl Danio tolerate cooler temperatures well and can be stored in an unheated tank
  • They swim at all levels, but due to their tendency to jump, the tank should be well covered. Longer tanks are preferred, plants along the back and sides
  • Their iridescent colors are most clearly visible in reflected ceiling lighting. They especially love the early sunlight. So make sure you have plenty of lighting
  • While they don’t meet the water parameters, they work best in neutral water that is soft to slightly hard
Celestial Pearl Danio Care Guide

Celestial Pearl Danio Diet

Celestial Pearl Danio eat all types of live, frozen, and flake foods.

In nature, their diet consists mainly of insects and zooplankton.

To maintain health, feed them:

  • Good quality tropical flake
  • Granulated foods
  • Frozen and live foods like Tubifex, mosquito larvae, brine shrimp, and Daphnia
Celestial Pearl Danios Feeding

Celestial Pearl Danio Breeding

Celestial Pearl Danio are an easy-to-breed fish that lays eggs.

The female is full-bodied, while the males are noticeably smaller and more colorful. Like other Danios, breeding pairs are very loyal.

Basic Aquarium requirements for Celestial Pearl Danio

  • The rearing tank should be warm (79-86F (26-30C))
  • The water level should be shallow (10-15 cm)
  • Fine-leaved plants should be planted floating or in groups
  • Marbles are an excellent substrate on which stray eggs can fall out of the reach of hungry adult fish

Celestial Pearl Danio spawning

Celestial Pearl Danio will spawn as a couple or in a school.

  • Half of the females as males should be added a few days before introducing the males into the breeding tank
  • Once the males are added, pairs form and leave the group to scatter eggs between the plants
  • Remove the adults once spawning is complete. Otherwise, they will eat their own eggs
  • Keep the tank dark while the eggs develop to prevent fungal growth.
  • At 24–25 °C, the the larvae hatch within 36 to 72 hours and should be fed freshly hatched shrimp soup or Infusoria

Young Celestial Pearl Danio

Young Celestial Pearl Danio are dark and cryptic initially and for about three days after hatching, they hide away between substrate and detritus and are very hard to see.

They subsequently become lighter in color and start swimming freely in 6 to 7 days and feeding on their own. Feeds them finely ground dry food or commercially prepared brood food.

Celestial Pearl Danio metamorphosis

At some 8–10 weeks after hatching, they undergo metamorphosis to adult form, and the color pattern starts to appear from week 12 onwards.

Breeding Celestial Pearl Danio – From Start to Finish

Celestial Pearl Danio Infections and Diseases

Although Celestial Pearl Danio are resistant to many bacterial diseases poorly maintained aquarium ecosystems will definitely affect the fish.

You should therefore practice good aquarium maintenance to avoid the Celestial Pearl Danio suffering from the following:


In most cases, infections occur through the introduction of live food and green vegetation. You should therefore constantly monitor the purity of the water.


Dominant fish will always overstress the weaker inhabitants. Over time, the smaller fish will wither if they cannot get enough food. If you notice that the Celestial Pearl Danio  are competing for food with their larger tanks mates, you should separate them.

Pop-eye (Exophthalmia)

This is an infection of the eyes which is attributed to poor water quality. There is a protrusion of the eyes, and after that they fall out. A blind fish cannot eat and dies of exhaustion. As a preventive measure, it is recommended to partially replace the water every two days.

Fungal infections

Fungal infections are normally caused by a non-compliance with the temperature regime. To learn how to treat fish with fungal infections and how to prevent fungal infections from spreading in the aquarium, read this article.


This causes the appearance of parasites on the outer surface of the body and fins. As a preventive measure, a tablespoon of salt per 10 liters of water is added to the aquarium.


In addition, the chemical composition of the water must be monitored. Major unchecked adverse changes will lead to the death of residents.

For more comprehensive information on fish health, infections, diseases and preventative measures, read this article

Celestial Pearl Danio Reviews

When you ask aquarists about Celestial Pearl Danio in general and regarding maintenance and care, you get a mixture of the following reactions:

There is a unanimous agreement on how active and nimble the fish are. When they reach adulthood, they lose their anxiety and are absolutely a delight to have in the tank. Younger ones tend to have an anxiety about them that eventually disappears with adulthood.

When it comes to feeding, some aquarists have issues with feeding the fish. Feeding the fish in a multi-species aquarium is a balancing act because you have to make sure other fish do not eat all the food before the Celestial Pearl Danio have been fed.

They are definitely a show stopper. Their beauty and simplicity will brighten up any aquarium. You will be treated to a myriad of colors and shades: pink, green, yellow with all sorts of stripes and spots, large and not very fin-shaped.

They tend to be very calm and resilient. Introduction of new species into a tank that has a school of Celestial Pearl Danio does not really affect them. They tend to remain calm.

Celestial Pearl Danio Summary

Do you enjoy looking at your aquarium after a long day at work?

Then the Celestial Pearl Danio has a lot to offer you:

  • Their amazing colors are amazing to look at. Think rainbow and aquarium together. Because you get them as a school, their if plenty of color to look at
  • They are low maintenance and get along well with most calm species. You therefore do not have to worry about separating the species every few weeks
  • They are not true shoaling fishes. That means they do not require large numbers of other fish belonging to the same species to survive.