Opaline gourami
A variant of Three-spot gourami (Trichopodus trichopterus)

Representative Three-spot gouramiphoto — a dedicated image of this exact morph isn't available yet.
A marbled blue line where the spots dissolve into a swirling dark-blue mottled pattern over the body. Selectively bred variant of the blue form.
Keeper tips for this variant
Provide floating plants and a calm surface — opalines build bubble nests and are happier breeders/displayers when the water surface is still and dimly lit from above.