view of a marbled gourami aquarium fish on a white background

gourami marbled aquarium under air breather marches nest builder guard omnivores opaline peaceful peatlands scales silver marble pattern sluggish waters standing water swamps tail fin three spot trichopodus trichopterus underwater white shallow lowland wetlands pectoral fins labyrinth organ anabantoids aquatic long pelvic bluish bubble canals captive bred caudal color morph