> The blue-ringed octopus is 12 to 20 cm (5 to 8 in), but its venom is powerful enough to kill humans. No blue-ringed octopus antivenom is available yet, making it one of the deadliest reef inhabitants in the ocean.
The octopus produces venom containing tetrodotoxin, histamine, tryptamine, octopamine, taurine, acetylcholine, and dopamine. The major neurotoxin component of the blue-ringed octopus is a venom that was originally known as maculotoxin but was later found to be identical to tetrodotoxin,[6] a neurotoxin also found in pufferfish and some poison dart frogs[7] that is 1200 times mo…