Trigonostigma heteromorpha also known as the Harlequin rasbora is one of the most popular species of tropical fish. Then species name heteromorpha in Greek means “differently shaped", alludes to the fact that the body shape of this species differs from that of other members of the genus Rasbora. Harlequin rasbora are marked with black triangular patch upon the body which is similar to the pattern found on a harlequin costume. T. heteromorpha has been in the aquarium hobby since 1934. Harlequin rasbora are listed on the IUCN Red List of Endangered Species due to overfishing for the aquarium trade and habitat conversion to farmland, urbanization and drainage are the main threats.

 

This species is peaceful making them the perfect resident in a community tanks. Harlequin fish are known to be a schooling species so it’s common to order four to six juveniles at a minimum. H. rasbora is known to school together in the upper to middle areas of the aquarium. In terms of water chemistry and feeding they are undemanding. There are differences between the males and females, mature females are usually rounder-bellied and often a little larger than the slimmer, more colorful males. Check out the video below to see how beautiful and graceful these fish really are. Remember when ordering try to order six at a minimum, if you can go for ten. They are just amazing. Order today!