Synanceia

Synanceia
Type species Synanceia verrucosa, 1801 illustration
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Scorpaeniformes
Family:	Synanceiidae
Genus:	Synanceia Bloch and J. G. Schneider, 1801

Synanceia is a genus of fish of the family Synanceiidae, the stonefishes, whose members are venomous, dangerous, and even fatal to humans. It is one of the most venomous fish known. They are found in the coastal regions of the 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 the stonefish's ability to camouflage itself with a grey and mottled color similar to the color of a stone. Swimmers may not notice them, and may 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.

Classification

The type species of the genus is Synanceia verrucosa, which includes the species Synanceia horrida that Linnaeus described as Scorpaena. The authors of Synanceia are Marcus Elieser Bloch and Johann Gottlob Schneider in the latter's republication of Systema Ichthyologiae iconibus cx illustratum (Illustrated catalog of Fishes), in 1801. The description was accompanied by an illustration by J. F. Hennig. The misspelling Synanceja is regarded as a synonym for this genus.

Species

Synanceia verrucosa in a public aquarium

The following is a list of species in the genus:

• Synanceia alula Eschmeyer & Rama Rao, 1973
• Synanceia horrida (Linnaeus, 1766) (Estuarine stonefish)
• Synanceia nana Eschmeyer & Rama Rao, 1973 (Red Sea stonefish)
• Synanceia platyrhyncha Bleeker, 1874
• Synanceia verrucosa Bloch and J. G. Schneider, 1801 (Stonefish)

Treatment of envenomation

Stonefish stings are both potentially lethal and extremely painful. The two most recommended treatments include the application of heat to the affected area and antivenom. People have used hot water (at a temperature no lower than 45 °C (113 °F)) applied to the injured area which has been found to destroy stonefish venom, and causes minimal discomfort to the victim. For more extreme cases, antivenom has been used. Vinegar can be found on some Australian beaches where there are frequent cases of people stepping on these fish, as the vinegar is said to lessen the pain.

Stonefish stings in Australia

Stonefish

Stonefish stings in Australia can cause envenomation and death if not treated. The stonefish is one of the most venomous fish in the world and when stepped on by a human forces venom into the foot. Most stonefish stings occur as a result of stepping on the creature 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, with stonefish being able to stay out of the water for up to 24 hours. They often cannot be easily seen as they look similar to rocks or coral. Stonefish antivenom is the second-most administered in Australia.

Aborigines know of the venom of the stonefish and have corroborees which involve re-enacting death from someone who trod on the fish. The Aborigines of Northern Australia and the Great Barrier Reef have different 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.

Number of incidents

1936 article from Melbourne newspaper The Argus about venomous stonefish.

There were 25 cases of the use of antivenom for stonefish reported to Commonwealth Serum Laboratories for a one-year period between July 1989 and June 1990, with most from Queensland and four from the Northern Territory. There were 14 calls to the Queensland Poisons Information System in 2008 regarding stonefish poison.

Fatal incidents

Name, age	Date	Species	Location
Dr Joseph Leathom Wassell	7 April 1915		Thursday Island

Non-fatal incidents

Some notable non-fatal incidents which have appeared in reliable sources are listed below:

Name, age	Date	Species	Location
12-year-old girl	2007		Mooloolaba, Queensland
3-year-old boy	October 2004		Moreton Island
29-year-old man	July 2015		Indonesia
Matt Wong	August 2015		Mauritius

As food

Though Synanceia are venomous and dangerous to human beings, they are actually consumed as food in some parts of Asia, including south Japan, south Fujian and Guangdong in China, and Hong Kong. Their venom is harmless after heating. In the Hokkien-speaking area, they are considered delicacies and good for health. The meat of Synanceia is white, dense and sweet, and the skin is also edible. They are usually cooked with ginger into a clear soup, and sometimes served raw as sushi or sashimi.

Cultural references

In the Ian Fleming short story The Hildebrand Rarity, the Seychelles islander Fidele Barbey asks James Bond, "Ever seen a man that's stepped on a stonefish? His body bends backwards like a bow with the pain. Sometimes it's so frightful his eyes literally fall out of their sockets. They very seldom live."

Further reading

• FishBase entry

External links

• National Geographic video, Deadly Stone Fish
• Reef Stonefish, Synanceia verrucosa Australian museum