Synanceia
Synanceia is a genus of fish of the family Synanceiidae, the stonefish, whose members are venomous, dangerous and even fatal to humans. They are the most venomous fish known. They are found in the coastal regions of the Indo-Pacific.
Taxonomy
The type species of the genus is Synanceia verrucosa, which includes the species Synanceia horrida that Linnaeus described as Scorpaena. The misspelling Synanceja is regarded as a synonym for this genus.Species
The following is a list of species in the genus:| Image | Scientific Name | Common Name | Distribution |
| Synanceia alula | Midget stonefish | northern Indian Ocean to the Solomon Islands | |
| Synanceia horrida | Estuarine stonefish | India to China, the Philippines, Papua New Guinea and Australia, and is also recorded in Vanuatu | |
| Synanceia nana | Red Sea stonefish | Red Sea and Persian Gulf | |
| Synanceia platyrhyncha | Indonesia | ||
| Synanceia verrucosa | Stonefish | Red Sea and Indo-Pacific |
Habitat and characteristics
Synanceia are primarily marine, though some species are known to live in rivers. Its species have potent neurotoxins secreted from glands at the base of their needle-like dorsal fin spines which stick up when disturbed or threatened. The vernacular name of the species, the stonefish, derives from its grey and mottled camouflage similar to the color of a stone. Swimmers may not notice them and inadvertently step on them, triggering a sting. When the stonefish is disturbed, it may inject an amount of venom proportional to the amount of pressure applied to it.A study published in 2018 reports that stonefish also have the ability to extend a sharp, specialized spine known as a lachrymal saber as an additional defense mechanism.
The venom of Synanceia is potent and can result in cellular deterioration of the afflicted organism due to toxins that target cellular membranes. The venom can also lower white blood cell count and lead to infection of the area even after appropriate treatment of the wound.
Treatment of envenomation
Stonefish stings are extremely painful and potentially lethal. The two most recommended treatments are the application of heat to the affected area, and antivenom. Hot water applied to the injured area has been found to denature stonefish venom, and causes minimal discomfort to the victim. Antivenom is used in more extreme cases. Vinegar is found on some Australian beaches as it is said to lessen the pain.Stonefish stings in Australia
The stonefish is one of the most venomous fish in the world and stings can cause death if not treated. Most stonefish stings occur as a result of stepping on the creature which forces venom into the foot, while it is less common for the fish to sting when it is picked up. Stonefish stings can occur on the beach, not just in the water, since stonefish can survive out of the water for up to 24 hours. They are not easily seen as they look similar to rocks or coral. Stonefish antivenom is the second-most administered in Australia.Some Indigenous Australians have corroborees which involve re-enacting the death of someone who trod on the fish. The Aboriginal people of Northern Australia and the Great Barrier Reef have ways of preparing the fish for eating to avoid poisoning.
After stonefish envenomation the amount of anti-venom given depends on the number of puncture wounds from the stonefish spines.