Broad Stripe Rasbora - Rasbora dandia Fish Profile & Care Guide
Introduction
The Broad Stripe Rasbora (Rasbora dandia) is a small to medium-sized cyprinid from South Asia. This species is hardy and adaptable. Kept in a decent-sized, well-maintained tank with a proper shoal and compatible tankmates, Rasbora dandia makes an active, attractive, and relatively undemanding addition to a South Asian-themed community aquarium. These fish can grow to around 9–10 cm, with a long, streamlined body made for active swimming in the open water. Its base colour is a bright silvery tone, with a darker back and clean, clear tail fins that help it stand out in a group.
The standout feature is a bold, dark band that stretches from the eye all the way to the tail, delicately trimmed with a hint of gold that makes the fish look crisp and neatly patterned. The mouth faces straight forward rather than upwards, matching its habit of feeding in midwater and just below the surface. In a well-lit aquarium with reasonable care, the contrast between the dark stripe and the reflective silver sides becomes even more striking, especially when a whole shoal is on the move.
Broad Stripe Rasboras are surface-oriented and often occupy the upper part of the water column, usually in loose to fairly large shoals. In streams and flooded fields, they cruise back and forth in groups, picking off tiny prey from the current and the surface film. Keeping them in small numbers tends to make individuals nervous and more prone to hiding. In the aquarium, they should be treated as a true shoaling species and kept in a group of at least eight to ten specimens, which allows them to display natural schooling behaviour, enhances colour, and spreads social pressure across the group.
Broad Stripe Rasboras are peaceful fish that fit well into calm community aquaria, similar to other Rasbora and slender danionin species. Suitable companions include non-nippy barbs of comparable size, other Rasboras and Danios, small peaceful Gouramis, Livebearers that are not overly boisterous, and bottom dwellers such as small Loaches or Corydoras-type catfish. Because the species is streamlined and not very deep-bodied, it should not be kept with large predatory Cichlids or any fish that could view it as food. Very aggressive or fin-nipping species will also stress the shoal and should be avoided.
It is best to provide a tank with good horizontal swimming space and a tight-fitting lid, as rasboras are active near the surface and may jump if startled. A mix of open areas and planted zones works well. Fine sand or smooth gravel, driftwood and rounded stones help echo natural stream and canal beds. Floating or tall plants that break up the light will make the fish feel more secure, reflecting the shaded conditions under riparian vegetation in much of their range.
General guidance for rasboras is soft to moderately hard, slightly acidic to neutral water, with temperatures in the low to mid twenties Celsius, and very low ammonia and nitrite. Broad Stripe Rasboras tolerate a range of conditions in nature, including somewhat turbid or disturbed waters, but in the aquarium, they will do best in clean, stable water with regular partial water changes and gentle to moderate flow to ensure good oxygenation.
Use a reliable filter that provides steady but not violent circulation. Because the species naturally occurs in habitats from hill streams to quiet ponds, it adapts well, but sudden swings in temperature or chemistry should be avoided. Keeping nitrates low with weekly water changes and avoiding over-feeding will go a long way toward maintaining health.
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Sexual Dimorphism
In Broad Stripe Rasboras, the differences between males and females are pretty subtle, but they follow the same pattern seen in closely related rasboras. Mature females are fuller-bodied, with a noticeably rounder belly and often a slightly larger overall size, especially when they are carrying eggs. Males tend to stay slimmer and can show a crisper, more intense dark stripe and a cleaner body outline, particularly when in good condition and displaying to the group, which matches the general pattern of stronger colour and a finer build in male rasboras. In practice, the easiest way to sex them is to compare several mature fish side by side: the rounder, deeper-bodied individuals will almost always be females, while the more streamlined fish with slightly sharper markings are usually males.
Quick Facts
| Scientific Name | Rasbora dandia |
|---|---|
| Year Described | 1844 |
| Other Names | Broad-lined Striped Rasbora |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Cypriniformes |
| Family | Danionidae |
| Genus | Rasbora |
| Origins | India Pakistan Sri Lanka |
| Approx Max Size | 10 cm |
| Temperament | Peaceful |
| Aquarium Level | Middle - Top |
| Difficulty | Beginner - Intermediate |
| Shoaling | Yes |
| Best kept as | Groups 6+ |
| Diet & Feeding | Omnivore |
| Reproduction | Egg-Scatterer |
| Average Lifespan | Up to 5 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 6.5 - 7.0 |
| GH | 5 - 12 |
| KH | 3 - 8 |
| TDS | 100 - 250 |
| ℉ | 72 - 79 |
|---|---|
| ℃ | 22 - 26 |
Natural Habitat
In the wild, Broad Stripe Rasboras are ubiquitous South Asian fish, recorded from India, Pakistan and Sri Lanka, with many populations in the Western Ghats and lowland river systems. These fish occupy an impressive range of shallow freshwater environments, including rivers and streams, rice fields, pools, ditches, ponds, canals, and small rivers, rather than being tied to a single specialised habitat type. It is particularly common in lowland waters with gentle to moderate flow, often over sandy or silty bottoms with marginal vegetation, but it also turns up in more disturbed and even polluted stretches of river, which highlights how hardy and adaptable it is. Thanks to its wide range and ability to cope with varied conditions, It is currently classified as Least Concern on the IUCN Red List, though pollution and the loss of natural habitat can still negatively impact some local populations.
Breeding
In the wild, the Broad Stripe Rasbora is a seasonal breeder, with studies on natural populations showing a long breeding season that runs roughly from June through to November in its home waters. Like most small cyprinids, it does not guard a nest or care for its young, but scatters adhesive eggs in open water or over plants and other fine structures, leaving them to develop on their own. Well-conditioned adults will spawn repeatedly during the season, and related forms such as Rasbora cf. dandia are known to release small batches of eggs regularly when kept in good conditions, with fry often appearing in densely planted aquaria. In practical aquarium terms, this means breeding is usually encouraged by offering a varied, high-quality diet, maintaining clean, warm water, and providing a separate, well-planted or mesh-bottomed spawning tank so the adults can be removed after spawning, reducing egg losses to parental predation.
Diet & Feeding
The Broad Stripe Rasbora is an opportunistic omnivore that spends much of its time picking off tiny food items from midwater and just below the surface. Its natural diet includes small aquatic insects, insect larvae, tiny crustaceans such as planktonic copepods, microscopic organisms and bits of plant or organic material. In the aquarium, this translates into a fish that thrives on a varied, fine-sized diet. A good-quality flake or small micro-pellet can be used as the staple, backed up with regular offerings of live or frozen foods like daphnia, cyclops, mosquito larvae, and baby brine shrimp to bring out colour and encourage breeding. Because they have small mouths and fast metabolisms, it is better to feed small portions two or three times a day rather than a single large meal, making sure all food is devoured so it does not foul the water.
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Published: 10 Dec 2025
Last Updated: 10 Dec 2025