2002, Gary Elson, Oliver Lucanus,Gouramies and Other Labyrinth Fishes,page 6:
Thelabyrinth organ may work a bit like a lung, but it is an entirely different solution to the problem of how to remove oxygen from air.[…]Thelabyrinth organ is an effective adaptation to low-oxygen habitats.
2008, Tim M. Berra,Freshwater Fish Distribution,page480:
Thelabyrinth organ fills most of the opercular cavity and is positioned behind and above the gill chamber and extends into the suprabranchial space; hence the name suprabranchial organ.
2012, Helen E. Roberts, “MS 222 Anesthesia”, in Jörg Mayer, Thomas M. Donnelly, editors,Clinical Veterinary Advisor: Birds and Exotic Pets,page513:
Anesthesia of fish withlabyrinth organs (bettas, some gouramis, etc.) should be approached with caution. Owing to the unique anatomy of thelabyrinth organ (enables fish to breathe atmospheric oxygen) and the gills of these fish (thick lamellae and ecreased lamellar surface area), it is possible to "drown" the fish if an overdose of an anesthetic agent is given.
