Profile of the Pearl Danio fish species

Pearl Danio, Danio albolineatus fish

You can't go wrong with the pearl danio whether you're new to aquariums or simply want to add a lovely, tranquil fish to your community tank. This cordial species coexists peacefully with almost all other fish species and is resilient and simple to maintain. It is extremely alluring due to its iridescent hues. The pearl danio thrives in a 20-gallon aquarium and gives birth easily when kept in captivity.

Species Overview

Common Names: Pearl danio, spotted danio

Scientific Name: Danio albolineatus

Adult Size: 2 inches (6 cm)

Life Expectancy: 5 years


Family Cyprinidae
Origin Burma, Sumatra, Thailand
Social Peaceful schooling fish
Tank Level All
20 gallons
Diet Omnivore, eats most foods
Breeding Egglayer
Care Easy
pH 6.5 to 7.0
Hardness 5 to 12 dGH
Temperature 64 to 74 F (18 to 24 C)

Origin and Distribution

This species was first introduced to Europe in 1911, and since then it has become a well-liked fish in the aquarium trade. They come from clean, quickly flowing streams and rivers in Sumatra, Thailand, and Myanmar (formerly known as Burma). In the wild, they mostly eat zooplankton and insects.

There are a number of scientific names for this fish, some of which were originally given to what was later discovered to be color variations of the same species. The taxonomy of these colour variations is still up for debate. This species was once included in the Brachydanio genus, but such classification has since been disallowed.

This fish's name should not be mistaken with that of the celestial pearl danio, sometimes called the galaxy rasbora, Danio margaritatus, a dark-colored danio with white patches on its body and red or orange fins.

Colors and Markings

One of the most alluring freshwater fish is the one with the moniker for its iridescent colors. An orange-red stripe that extends from the tail to the midsection of the animal's pearly, blue-violet body serves as an accent. Males are more colorful, thinner, and smaller than females. They frequently have a reddish tinge along the ventral portion. Some places sell a yellow-ochre color variation known as the yellow danio. Pearl danios have two pairs of paired barbels and a forked tail.


Pearl danios are calm, make a good addition to community aquariums, and get along with other calm fish. They can coexist with a variety of different fish since they can tolerate a broad range of water conditions. Pearls should be kept in groups of at least five to eight, and ideally more, as do other members of the danio family. If there is at least one female around, males will exhibit their best characteristics.

Pearl Danio Habitat and Care

The pearl danio is used to high currents in the water since it evolved in swift-moving streams and rivers. Good filtration is crucial since they demand a little bit more oxygen than other danios. Pearls can also be kept in an unheated aquarium because they can withstand chilly temperatures well. They can swim at all levels, but because they like to leap, the tank needs to be well-covered.

Pearl fish are a fantastic starter fish since they are incredibly robust and simple to care for. Longer tanks with plants along the back and sides are preferred since they need enough of swimming space. Their iridescent hues are best seen in overhead, reflected illumination, and they enjoy morning sunshine in especially. They are not picky about the water's characteristics, although neutral water that is soft to slightly hard works best for them.

Pearl Danio Diet and Feeding

Pearls will eat any kind of food, including live, frozen, and flake foods. In the wild, their main sources of food are zooplankton and insects. Feed high-quality tropical flakes or granules, as well as frozen and live meals like tubifex, mosquito larvae, brine shrimp, and Daphnia to preserve health.

Gender Differences

Due to their bigger size and fuller bodies, females frequently have more robustness than males. Males are more colorful, leaner, and smaller. The ventral part of the males frequently has a crimson tinge.

Male and female pearl danios are similar in appearance. The biggest difference is that, when full of eggs, the female will have a more rounded body shape.

Breeding the Pearl Danio

An easy-to-breed egg-laying fish is the pearl danio. When breeding couples develop, they are incredibly devoted, much like other danios. The water level in the breeding tank should be kept shallow, between 4 and 6 inches, and at a warm temperature of 79 to 86°F (26 to 30°C) (10 to 15 cm). There should be fine-leaved plants available, either floating or planted together. A substrate made of marbles is perfect for letting wayward eggs fall out of the reach of ravenous adult fish. To safeguard eggs, a breeding grid or mop on the bottom might do.

Pearl danios can spawn in a school or in pairs. A few days before introducing the men, the breeding tank should be filled with half as many females as males. After the addition of the males, couples will form and depart the group to disperse eggs.

In order to replicate the rainy season of the native environment, spawning can also be started by progressively filling the tank with a tiny amount of cold water every several hours. Couples will spawn the next morning. The female is the best and quickest indicator; if the fish have spawned, she will be substantially thinner. As soon as spawning is complete, remove the adults; otherwise, they will eat their eggs.

To stop fungus from growing while the eggs are developing, keep the tank dark. Freshly hatched brine shrimp or should be given to the fry when they emerge in 36 to 48 hours. Young danios develop quickly and are able to swim freely after six to seven days. Fry can be reared on commercially produced fry food or finely ground dry food.

More Pet Fish Species and Further Research

There are several species of danios; each has a unique color pattern, and some (like the enormous danio) are significantly bigger than others. All danios are rather simple to maintain and make ideal companions for an already calm freshwater fish population. Check out these related species if you're curious:

Check out additional fish breed profiles for more information on other  fish.