Macropodus opercularis

The paradise fish, paradisefish, or paradise gourami, Macropodus opercularis, is a species of gourami found in most types of fresh water in East Asia, ranging from the Korean Peninsula to northern Vietnam. This species can reach a length of 6.7 cm (2.6 in), though most are only about 5.5 cm (2.2 in). Paradise gouramis were one of the first ornamental fish available to western aquarium keepers, having been imported 1869 to France by the French aquarium fish importer Pierre Carbonnier in Paris. The paradise fish is one of the more aggressive members of its family. It is more aggressive than the three spot gourami, yet less pugnacious in nature than the less commonly kept combtail.