'Over 26 years walking Horseshoe Bay - I've never seen anything quite like this before,' a local woman wrote as she shared images of the barnacles online. 'Nature never ceases to amaze!'
University of South Australia marine ecologist Dr Zoe Doubleday said there are two types of barnacles, the 'acorn' varieties like those which grow on ship hulls and rocks, and goose barnacles like those washed-up on Horseshoe Bay.
'I've never seen anything like it and it just must be an old pylon from a jetty or some piece of marine infrastructure that has been in the water for such a long time to grow a dense cluster of barnacles,' she said.
Some locals suggested those on the beach should try eating the barnacles, with one adding: 'apparently they taste similar to razor fish'. 'Grab them, paella heaven.'
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