Fisheries officer Troy Duthie said the bluebottles being blown onto the beach with the incoming tide was a natural occurrence which happened during the warmer months.

He said the jellyfish only produced a mild sting.

"I certainly wouldn't suggest staying out of the water because there are a few of them around," he said.

"Once they wash up on the beach they will die pretty quickly."

The bluebottles or Portuguese man o' war don't have the same deadly venom as the northern box jellyfish, which can kill humans.

No fatalities have ever been reported within Australia or New Zealand from the sting of a blue bottle, according to Australianfauna.com

If you are stung, it is best to wash the area without touching and use a cold pack to relieve the pain, and if needed consult a doctor.

Bluebottles range from a blue to a pink hue, with a translucent measuring between three to 15cms.

Tentacles can range in length from 15cms up to 10 metres.

A green sea turtle was also found washed up at the weekend in Warrnambool, but is understood to have passed away.

A Melbourne-based marine rescue worker said it was unusual for turtles to wash up and when they did they were usually unwell.

"It's probably two years since I've heard of one washing up," he said.

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