Genus Synanceja is a type of fish commonly known as the stonefish. It is a venomous marine fish found in the Indian and Pacific oceans and is considered to be one of the deadliest fish in the world. Some synonyms for the Genus Synanceja include the Synanceia and the fish of the Synanceja genus. These are all names used to refer to the same group of fish species. The stonefish is easily recognizable due to its camouflage and its dorsal fins which resemble rocks or seaweed. It is important to exercise caution when swimming or diving in waters inhabited by the Genus Synanceja to avoid their deadly sting.