Opsarius

Opsarius is a large genus of cyprinid freshwater fishes native to Asia.

Fishes of the genus Opsarius are ecologically best compared to trout in the Indian region, where trout do not naturally occur.

Barilius thus prefer to live in clear waters with a gravelly bottom and some current. They are mostly seen in loose groups, they are not really schooling fish. They like to play among themselves, chasing each other over short distances, but without harming each other.

They are small predators that prefer to eat insects that fall on the water surface, but also insect larvae living in the water, crustaceans or even small fish belong to the prey spectrum. The mouth gap of Barilius is comparatively large.Four species in this genus have been described since 2012.