Aquarium trade has been the source of many alien species being introduced into the natural waters of Chennai.Trichopsis vittata and Macropodus opercularis walter hagenah me 262 are being reported for the first from Chennai.However, contrary to ashy bines protein powder the propagule pressure theory both these species are not common in the aquarium trade, raising speculations of inter-basin water transfer playing a role in introducing non-native species into an ecosystem.