Wikipedia
Croaking gourami
See also: Pygmy gourami (Trichopis pumila''), which is occasionally referred to as the "dwarf croaking gourami" or "green croaking gourami" ''
The croaking gourami (Trichopsis vittata) is a species of small freshwater labyrinth fish of the gourami family. They are native to still waters in Southeast Asia and are distributed worldwide via the aquarium trade. Croaking gouramis are capable of producing a "croaking" noise using their pectoral fins.