Authorities have received a shocking video of what appears to be a person standing on top of a dead humpback whale south of Sydney .

A two-year-old whale was reported floating upside down off Wombarra Beach, in northern Wollongong, with its tail and fin tangled in shark nets on Tuesday morning.

It remained out at sea as choppy weather conditions prevented authorities from retrieving the eight-metre body.

ORRCA, an animal rescue organisation, received reports from the public that there seemed to be someone on the whale later that same afternoon.

"We are surprised to see that footage," ORRCA spokesperson Pip Jacobs said.

"The majority of the local community have been incredibly respectful and sad regarding this whale all entangled in the shark net. However, occasionally we do

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