Species description

Care, breeding and tankmates

Fish profile

Temperament

Semi-aggressive

The Pearl Danio is exceptionally peaceful, playful, and completely non-aggressive toward other species. They are a schooling fish that must be kept in groups; individuals kept alone will become highly stressed, lethargic, and susceptible to disease. Within their school, they frequently chase each other in harmless, playful displays.

Diet

Omnivore

In the wild, they are omnivorous micro-predators feeding on small insects, zooplankton, and algae. In the aquarium, they are unfussy eaters that will readily accept high-quality flakes, micro-pellets, and freeze-dried foods. Supplementing their diet with live or frozen bloodworms, daphnia, and brine shrimp will enhance their iridescent colors.

Sex ratio

School

Females are generally plumper, slightly larger, and less intensely colored than the males, especially when full of eggs. Males display brighter pink and blue iridescence and are noticeably slimmer. They should be kept in a mixed-sex school of at least 8 to 10 individuals to encourage natural behaviors.

Feeding frequency

Twice daily

Due to their high activity levels and fast metabolism, they should be fed small amounts two to three times daily. They are surface and mid-water feeders that eagerly attack food as soon as it hits the water. Ensure they consume all offered food within a few minutes to prevent water pollution.

Bioload

The Pearl Danio produces a relatively low bioload individually, but they must be kept in schools, which collectively produce a moderate bioload. They are extremely active fish that consume a fair amount of food, contributing to waste production. Standard, efficient biological filtration and regular weekly water changes are sufficient to maintain good water quality.

Flow

Stagnant

Originating from clear, flowing streams in Southeast Asia, they appreciate moderate to strong water flow. A powerhead or strong filter return provides the current they enjoy swimming against, keeping them active and healthy. Good surface agitation is also important to maintain high dissolved oxygen levels.

Reproduction

Oviparous

They are prolific egg scatterers that are very easy to breed in captivity. A conditioned pair or group placed in a separate breeding tank with marbles or a breeding mop will spawn at first light. The parents will eagerly eat their own eggs, so they must be removed immediately after spawning is complete.

Compatibility & tankmates

They are highly peaceful, active schooling fish that make excellent additions to a community aquarium. They do well with other similarly sized, active species like tetras, rasboras, and small catfish. Their fast, darting movements might stress out very shy or slow-moving fish like gouramis or bettas.

Tank level

Top/Middle

They are highly active fish that predominantly occupy the upper and middle levels of the aquarium. They are constantly in motion, darting back and forth across the length of the tank. While they appreciate some floating plants for cover, they require plenty of open swimming space.