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Ariidae (Tachysuridae; sea catfish; subclass Actinopterygii, order Siluriformes) A family of mainly marine catfish with a forked tail fin, adipose dorsal fin, naked skin, and several pairs of barbels around the mouth. They are found in tropical and subtropical seas around the world. Many species carry out buccal incubation, the males incubating fertilized eggs in the mouth for up to six weeks. There are many species.