By Sheetal Kumari | September 16, 2025
Deadly and diminutive, the blue-ringed octopus is one of the sea’s most notorious inhabitants.
Image: Canva
The tiny octopuses are found in Australia’s and Japan’s coastal waters, where they take cover in coral reefs and tide pools.
Image: Canva
Only 12–20 cm long, the blue-ringed octopus carries a deadly venom in its small body.
Image: Canva
Its vibrant blue rings show when it senses danger, alerting predators to its deadly toxicity.
Image: Canva
The venom holds the tetrodotoxin, a potent neurotoxin, so potent that it can paralyse and kill humans.
Image: Canva
The octopus employs venomous bites to paralyse prey, which it feeds on in the form of small crabs, shrimp, and fish.
Image: Canva
Despite not being aggressive, touching or picking it up causes it to issue a venomous bite, usually painlessly.
Image: Canva
No antivenom exists; supportive care only until the toxin passes.
Image: Canva
Shy despite the danger, the blue-ringed octopus tries to avoid humans as much as possible.
Image: Canva
Look at a distance. Be aware to avoid accidents while enjoying this amazing sea animal.
Image: Canva