Osphronemus is the genus of giant gouramis, large air-breathing labyrinth fish in the gourami family native to lowland rivers, swamps, and floodplains across Southeast Asia. The atlas's records span Indonesia, Malaysia, Cambodia, Laos, and Thailand, along with long-established introduced populations in Colombia, India, and Madagascar — a reflection of how widely the giant gourami has been moved around the world as a food fish. Like other anabantoids, Osphronemus species carry a labyrinth organ above the gills that lets them gulp air at the surface and tolerate warm, oxygen-poor water. They are deep-bodied and thick-lipped, and the atlas's four species range from 19.5–27.5 in as adults, dwarfing almost every other gourami kept in home aquaria.
Osphronemus goramy, the giant gourami, is both a major Southeast Asian aquaculture food fish and a long-running aquarium curiosity, usually bought as a small juvenile and quickly outgrown — adults need pond-sized quarters, not a home tank. The elephant ear gourami (O. exodon) takes its name from a distinctively fleshy, down-turned lower lip, while the giant red-tail gourami (O. laticlavius) and the King of the Giant Gourami (O. septemfasciatus) are Sumatran blackwater species valued by specialists for bolder red and banded finnage. All are omnivorous grazers taking plant matter, fruit, insects, and small animals, and pairs typically guard a nest built from plant material rather than a classic bubble nest.
Conservation status within the genus is mixed: the widely farmed O. goramy and one other species are rated Least Concern, but the more range-restricted Sumatran forms carry a Vulnerable and an Endangered rating — a reminder that habitat loss and aquarium- or food-trade overcollection can hit localized populations hard even within a genus built around one of the world's most cultivated freshwater fish.