Synanceiidae is a family of Actinopterygii, ray-finned fish, found in the Indo-Pacific oceans. They are primarily marine, though some species are known to live in fresh or brackish waters. The various species of this family are known informally as stonefish, stinger, stingfish and ghouls. The most prominent genus of the family is Synanceia, which is sometimes placed in the family Scorpaenidae. Its species are known to have the most potent neurotoxins of all the fish venoms, secreted from glands at the base of their needle-like dorsal fin spines. The vernacular name of the species derives from their behaviour of camouflaging as rocks. The type species of the family is the stonefish, Synanceia verrucosa.