Max Size: 2cm

Exclamation Point Rasbora (Boraras urophthalmoides)

The Exclamation Point Rasbora is a very hardy and peaceful fish but does not fair well with community fish due to its small size and rather timid nature. It will do best when maintained alone, with similar sized fish or other miniature species. This Rasbora also makes an ideal companion for shy anabantoids and are perfect for the nano or planted aquarium.

This Rasbora is a shoaling fish by nature and ideally should be kept in a group of at least 8-10 specimens. Sustaining it in decent numbers will not only make the fish less apprehensive but will result in a more powerful, natural-looking display. Males will also present their best colour and some exciting behaviours as they compete with one other for female attention.

Their body usually is golden yellow with a dark green or brown lateral stripe flowing down both sides of the body, ending just behind the dorsal fin. Some populations can develop an intense orangey-red line above the dark lateral stripe when in good condition.

There is also a similarly coloured distinct round dark blotch on the caudal peduncle. The darker patterns resemble a horizontal exclamation mark.


Exclamation point rasbora
Least rasbora
Least rasbora
Exclamation point rasbora
Exclamation Point Rasbora
Exclamation Point Rasbora
Quick Facts
Scientific NameBoraras urophthalmoides
Other NamesLeast Rasbora, Sparrow Rasbora, Spice Rasbora
OriginsCambodia, Thailand, Vietnam
Aquarium LevelMiddle - Top
DifficultyBeginner - Intermediate
Best kept asGroups 6+
Lifespan4 - 8 years
Water Parameters
Water TypeFreshwater
PH6.0 - 7.0
GH8 - 12
TDS18 - 179
76 - 82℉
24.4 - 27.8℃


In the home aquarium, the Exclamation Point 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 a male from a female Exclamation Point Rasbora. Mature females are often larger and noticeably rounder-bellied than males and have a golden colouration whereas the males are slimmer and turn a reddish colour when in breeding condition.

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: 01/10/2020 - Updated: 19/01/2022 14:15:05