labyrinth organ

labyrinth +‎ organ.

labyrinth organ (plural labyrinth organs)

1. (zoology) An organ common to fish of the suborder Anabantoidei that enables them to breathe air.
   • 2002, Gary Elson, Oliver Lucanus, Gouramies and Other Labyrinth Fishes, page 6:

     The labyrinth 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. […] The labyrinth organ is an effective adaptation to low-oxygen habitats.

   • 2008, Tim M. Berra, Freshwater Fish Distribution, page 480:

     The labyrinth 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, page 513:

     Anesthesia of fish with labyrinth organs (bettas, some gouramis, etc.) should be approached with caution. Owing to the unique anatomy of the labyrinth 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.

• labyrinth fish