A shocked swimmer has found one of the ocean’s most deadly creatures at a popular Sydney beach.

Footage posted online shows a blue-ringed octopus in a small fishing net after reportedly being found at Brighton Le-Sands, in the city’s south, on October 1.

While not initially looking like the deadly creature, the octopus flares its blue rings in a sign of aggression after sprayed with water.

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Despite being only centimetres long, the blue-ringed octopus is heralded as one of the most potentially deadly animals in the ocean due to its venom that is about 1000 times stronger than cyanide.

A single bite from the species leads to nausea, respiratory arrest, heart failure, severe paralysis, blindness and death without urgent treatment.

With such a deadly reputation, the

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