Stonefish Facts

Stonefish Profile

Stonefish are a family of fish called Synanceiidae. They are famous for being the most venomous fish in the world, with a sting that causes excruciating pain in humans.

Their name comes from their ability to blend in with rocky seafloors and amongst coral, which is what makes them so dangerous as they are easily stepped on by people.

Stonefish Facts

Stonefish Facts Overview

Habitat: Coastal areas, rocky reefs, rubble, and aquatic plants.
Location: Indo-pacific
Lifespan: 5-10 years
Size: 30-40cm long
Weight: Around 2kg
Color: Patches of red, orange, brown, yellow
Diet: Small fish and crustaceans
Predators: Sea snakes, stingrays, eels and sharks
Top Speed: Very fast when hunting, can catch and consume prey in as fast as 0.0015 seconds.
No. of Species:
Conservation Status:
Least Concern

There are 5 species of stonefish:

  • Midget stonefish (Synanceia alula)
  • Estuarine stonefish (Synanceia horrida)
  • Red Sea stonefish (Synanceia nana)
  • Synanceia platyrhyncha
  • Stonefish (Synanceia verrucose)

They are from coastal regions of the Indo-Pacific, for example Northern Australia, India, the Philippines, and others.

They are excellent at camouflage, with their skin matching rocky or coral ocean floors. This allows them to wait for their prey (small fish and crustaceans) to pass, when they strike at high speed and eat them whole.

They are hunted by sea snakes, stingrays, eels, and sharks, all of which are able to eat the stonefish while avoiding its venomous affects.

Interesting Stonefish Facts

1. They are the most venomous fish in the world.

The venom is lethal both to other marine animals and humans. It causes intense pain, breathing problems, damage to the heart, fits and paralysis. There is an anti-venom, but if it’s not delivered quickly the effects can be fatal. 1

Stonefish Beach Sign

2. The venom comes from their spines.

They have 13 spines along their backs which are what delivers the toxin. At the base of each spine is a venom sac which are activated under pressure, aka when someone steps on them.

Stonefish venom

3. Their venom is used for self-defence, not hunting.

Their hunting tactics focus on sitting completely still on the ocean floor, waiting for prey to pass. Their venom is only used for self-defence and they never actively hunt their prey or humans.

4. They are masters of camouflage.

As the name suggests, they are great at looking like a stone, with skin covered in patches of brown, yellow, orange, or red, along with a textured surface.

Stonefish camouflaged

5. They attack their prey fast.

They will sit still watching for prey and then attack and consume the prey with lighting speed, all as little 0.015 seconds.

6. There are a lot of stings, but very few mortalities.

There have been no recorded deaths from stonefish stings in Australia, and few in other countries. There are however lots of stings yearly, which require immediate medical attention. 2

Stonefish foot sting

7. They are related to lionfish.

Stonefish belong to the order Scorpaeniformes, which also contains lionfish. These are another highly venomous fish native to the Indo-pacific.

8. They are hunted by sea snakes.

It’s thought that sea snakes may be immune to the venom, but no one knows for sure. Sea snakes inject venom into the stonefish via their bite. Once the stonefish stops struggling they swallow them whole, head first so that their mouths don’t get caught on the spines. 3

9. They can survive out of water for 24 hours.

They can absorb oxygen through their skins, which allows them to survive when the tide goes out.

10. They are a delicacy.

They are popular in several parts of Asia, including Japan, Guangdong in China, and Hong Kong. When cooked, the venom loses its fatal qualities. It is also eaten raw, with the spines removed.

Stonefish Fishing

11. They feature in an aboriginal dance.

The dance is to warn children of the dangers of the stone fish stings and features a man replicating the pain of being stung.

Stonefish Fact-File Summary

Scientific Classification

Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Scorpaeniformes
Family: Synanceiidae
Genus: Synanceia

Fact Sources & References

  1. Yazawa K, Wang JW, Hao LY, Onoue Y, Kameyama M. Verrucotoxin, a stonefish venom, modulates calcium channel activity in guinea-pig ventricular myocytes. Br J Pharmacol. 2007;151(8):1198-1203. doi:10.1038/sj.bjp.0707340
  2. Spencer E. How Toxic is the Stonefish? – Ocean Conservancy. Published 2020. Accessed February 26, 2021.
  3. Clark Howard B. What Happens When Two of Ocean’s Most Venomous Creatures Fight — National Geographic. Published 2015. Accessed March 2, 2021.