The twin brother of shark victim Mercury Psillakis has led hundreds of surfers in a paddle out in his memory on Sydney's Northern Beaches on Saturday morning.

Mr Psillakis was mauled by a white shark, between 3.4 to 3.6 metres in length, a day before Father's Day while surfing with a group of friends at Long Reef Beach near Dee Why.

The 57-year-old was just 100m from the shore and had been in the ocean for half-an-hour when he, along with his board, disappeared underwater.

A couple of other surfers saw him in the surf and managed to get him back to shore. He had lost a lot of blood by then and was unresponsive.

At the time, authorities said he was missing "a number of limbs".

Three weeks on, aerial vision from the same location of the attack on Saturday, September 6, shows hundreds of

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