[Ebook] Encyclopedia of Aquarium & Pond Fish – Directory of Freshwater Fish – Cyprinids – Rasboras
The majority of rasboras are shoaling fish, and if they are kept singly in the aquarium, they become shy and nervous. There appears to be some recognition between members of a shoal, since new individuals added to an aquarium containing an established group are unlikely to be accepted readily by the rest of the shoal.
