Max Size: 4cm

Volcano Rasbora (Rasbora vulcanus)

Volcano Rasboras are active, peaceful, attractive and easy to keep making them a great addition to a community aquarium and the hobby. However, Volcano Rasboras are schooling species in nature; therefore, it would be best if you kept them in groups of at least eight individuals. Maintaining these fish in more significant numbers will not only make your fish less nervous but will result in a more natural-looking display. Males will also reveal their best colours as they compete for female attention.

Volcano Rasboras have no particular demands when it comes to water chemistry, so you can combine them with most of the popular fish in the hobby. These can include other small Cyprinids such as Barbs as well as Tetras, Rainbowfish, Livebearers, Catfish and Loaches.

Choosing decor is not crucial; however, these Rasboras tend to show better colouration when maintained in a heavily-planted set-up with a dark substrate. The addition of some driftwood roots or branches and some floating plants to help diffuse the aquarium's light also seems to be appreciated and also adds a more natural feel.

You should not add these Rasboras to a biologically immature aquarium as they can be susceptible to changes in water chemistry. Also, it is essential that your aquarium has a tight-fitting lid or a significantly lowered waterline as these fish are accomplished jumpers if startled or excited.

Volcano Rasboras have a dark lateral line down the entire length of the body and pinkish-red coloured fins, and there is a reticular scale pattern on the sides similar to that of Barbs. Males have a reddish-orange hue over their bodies that get more intense when spawning, and mature females have a pale golden hue over their body.


Volcano Rasbora
Quick Facts
Scientific NameRasbora vulcanus
Other NamesNone
Aquarium LevelBottom - Middle
DifficultyBeginner - Intermediate
Best kept asGroups 8+
Lifespan4 - 8 years
Water Parameters
Water TypeFreshwater
PH6.5 - 7.5
GH2 - 15
73 - 79℉
22.8 - 26.1℃


In the home aquarium, the Volcano Rasbora will readily accept most good quality dried foods such as granules, flakes and sinking pellets. These modern food products have been developed to provide all adequate nutrition to maintain your fish's health and dietary requirements.

Providing additional foodstuffs such as live, frozen, and freeze-dried meals such as bloodworm, daphnia, and tubifex once or twice a week will provide additional benefits to your fish's health and well-being but is not a must for this fish.

It should be noted that bloodworms should only be given as an occasional treat and should not be used as the staple diet as they are difficult for fish to digest and can potentially cause blockages.

This fish is an omnivore in the wild, meaning it will consume some vegetable matter. Although most modern fish foods take this into account and include them in their products, you can still supplement your fish's diet with blanched vegetables such as spinach, broccoli, and zucchini. Ensure you do not overfeed your fish and remove any leftovers the following day.

Sexual Dimorphism

It is relatively straightforward to differentiate between the males and female Volcano Rasboras. Males are usually a little slimmer, slightly smaller and more vibrantly coloured than females. In contrast, mature females are generally heavier-bodied, a little larger and appear a lot duller than males.

Other Rasboras of interest

Black Line Rasbora(Rasbora borapetensis)
Blue Line Rasbora(Rasbora sarawakensis)
Chilli Rasbora(Boraras Brigittae)
Clown Rasbora(Rasbora kalochroma)
Dwarf Rasbora(Boraras maculatus)
Emerald Eye Rasbora(Brevibora dorsiocellata)
View all Rasboras
Date Added: 08/02/2022 13:10:33 - Updated: 08/02/2022 13:31:53