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Anabantidae (climbing gouramis, labyrinth fish; subclass Actinopterygii, order Perciformes) A family of fish capable of aerial respiration because of the presence of an accessory respiratory organ. There are about 40 species, the best known of which is Anabas testudineus (climbing gourami or walking fish) of southern Asia. It lives in freshwater ponds and swamps, but can crawl over land in search of a new source of water during the dry season.