Exclamation Point Rasbora (Boraras urophthalmoides) Fish Species Profile
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.
|Scientific Name||Boraras urophthalmoides|
|Other Names||Least Rasbora, Sparrow Rasbora, Spice Rasbora|
|Aquarium Level||Middle - Top|
|Difficulty||Beginner - Intermediate|
|Best kept as||Groups 6+|
|Lifespan||4 - 8 years|
|Maximum Size||up to 2 cm|
|Temperature||76 - 82 ℉ (24.4 - 27.8 ℃)|
|PH||6.0 - 7.0|
|GH||8 - 12|
|TDS||18 - 179|
Origins of the Exclamation Point Rasbora
The Exclamation Point Rasbora has been found in Sai Buri, Mae Klong and Chao Phraya river basins in southern peninsular in Thailand where they inhabit shallow water structures such as marshes, swamps, ponds, rice paddies and peat bogs. The water is usually very soft and acidic and sometimes stained a tea-colour from tannins.
This fish has also been recorded in both Cambodia and Vietnam where one unusual group inhabits the moats and ponds of the Angkor Wat temple complex near Siem Reap.
You will find that in all the following areas there is an abundance of dense aquatic vegetation.
In the home aquarium, these fish will accept dried foods of a suitable size such as micropellets and crushed flake food but should not be given these solely.
Daily meals of small live and frozen foods such as artemia, baby brine shrimp, daphnia, cyclops and mini bloodworm will result in the best colourations and also encourage the fish to come into breeding condition.