Max Size: 3cm

Lambchop Rasbora (Trigonostigma espei)

The Lambchop Rasbora is a peaceful, active and friendly fish and makes an excellent addition to any peaceful community aquarium. It would be best if you kept these fish in groups of at least 8 to 10 individuals. Even though they do not usually swim in a tight school, their species companionship is essential.

These Rasboras can be kept with many other popular community fish and do well with peaceful bottom-dwelling fish. However, they do not suffice well in the company of aggressive, large fish.

These Rasboras are very hardy and require little extra care, so they are an excellent fish for a beginning aquarist. To bring out their most desirable colours, you should use a darker substrate and make sure you provide them with plenty of plants. It would be ideal if you had a tight-fitting lid on the tank; otherwise, these fish would likely jump if startled or excited.

The Lambchop Rasbora is a small, slender fish with a distinctive bronze colour with a pinkish blush. The body colour appears to be increasingly reflective, approaching the lateral line. It can vary slightly depending on the area it comes from, with some individuals having a more intense red. Its most distinguishing feature is the black lambchop-shaped marking along its side.


Lambchop rasbora
Quick Facts
Scientific NameTrigonostigma espei
Other NamesFalse Harlequin Rasbora, Narrow Wedge Harlequin, Slim Harlequin
OriginsCambodia, Thailand
Aquarium LevelAll Levels
Best kept asGroups 8+
Lifespan3 - 5 years
Water Parameters
Water TypeFreshwater
PH6.0 - 8.0
GH1 - 15
TDS18 - 179
73 - 80℉
22.8 - 26.7℃


In the home aquarium, the Lambchop 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 easy to differentiate male from female Lambchop Rasboras. Mature males are much brighter and slimmer than the females, and there dark wedge-like markings are much sharper with a more definitive outline. In contrast, the females will have a fuller belly, and a higher body and their marking are not as apparent as that of the 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: 06/01/2021 - Updated: 19/01/2022 14:16:58