Dwarf rasbora

Aquarium fish: Dwarf rasbora (Boraras maculatus)
Size: 2.5 cm
Origin: Asia
Water temperature: 24-28 ° C
Aquarium volume: 30 l

Dwarf rasbora (Boraras maculatus) – a small aquarium fish, one of the smallest of the carp family.In Polish literature it was also known as the dwarf razbora , which in fact is even smaller Rasbora urophthalmoides .


Asia . The species inhabits free-flowing rivers or standing waters in parts of Malaysia and Sumatra.

Characteristics and disposition

The spotted razbora can reach a length of up to 2.5 cm, but usually less. Females can be identified by a more rounded belly and a yellow or yellow-orange color of the body.

Males are more attractive, they have intense, rusty-red coloration. The pattern and color of the body may vary depending on the population they come from. Herd fish should be kept in the amount of at least 10 pieces. In the group they are less skittish and look more effective and natural. Males take on more vivid colors and show more interesting behavior by competing with each other for the favor of females.

Nutrition and feeding

They accept crushed dry food, but it is advisable to supplement the diet with small frozen or live food, eg Daphnia, Artemia.


Despite their small size, they also need a place to swim . During spawning, males temporarily occupy the territories. For a group of 8-10 individuals, an aquarium of at least 30 liters is required, densely overgrown (also with floating plants). Decorations made of roots, branches, dry leaves and any matter that releases tannins and humic compounds into the water, e.g.

alder cones, are also desirable. They do not like too strong water current and too bright lighting. The water should be soft and acidic with a pH of up to 6.5. In a social aquarium, we can keep them only with fish slightly larger than them, calmly disposed, e.g. pygmy cuirass , otosek , galaxy razbora .

Dwarf shrimps, e.g. red cherry, will be the perfect company for razbora .


Like many small cyprinids , this species spreads its spawnand leaves unattended. In a well-kept, mature tank, small amounts of fry may appear without our intervention. If we want to have more control over reproduction, we will need a spawning aquarium of about 10-15 liters, which we shade.

Leave the bottom clean or put a mesh with small meshes so that the roe passes between them and the adult fish do not get into it. Water should be acidic 5-6.5 ph, soft 1-5 ° dGH and temperature 26-28 ° C. Put a large amount of moss or other finely leafy plant into the aquarium so that it fills half of the available space. Filtration is not required, but it won’t hurt to use a small sponge filter. In the evening we transfer two or three pairs to the prepared tank.

We slowly acclimatize them to the new surroundings and water parameters. Spawning usually takes place the next morning. Although the parents eat the roe, they are not active in hunting it . We keep the fish in the breeding aquarium for no longer than a few days. Hatching takes place on the 2nd day after the appearance of the eggs.

After the next day, we start feeding with micro foods. About 7-10 days after hatching, we give Artemia, larvae, etc. small live food. After a week, we start changing the water in small amounts


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