Body of Kiwi Sean Mitchell found in Perth river 10 days after he went missing

Western Australia police are searching for missing 37-year-old Sean David Mitchell. Photo / Supplied

A body believed to be that of missing 37-year-old Sean Mitchell has been found in Perth's Swan River.

The body was found by a member of the public in the water near Chidley Point Reserve in Mosman Park, where police had been searching since last week.

Police say no suspicious circumstances had been identified and the family of Mr Mitchell, who went missing 10 days ago on May 20, had been notified.

Mr Mitchell, 37, of Rotorua was last spoken to by a friend when he told her he was about to board a yacht moored on the Swan River near the Royal Freshwater Bay Yacht Club on Friday, May 20.

He was earlier seen drinking with friends at a beer cafe in Perth at about 5pm.

It is believed Mr Mitchell used his Smart Rider card to board public transport at 9pm, but he did not tag off.

An hour later he called a friend and spoke to her about going on another friend's yacht moored on the Swan River.

The friend has confirmed he got on the yacht and then used their dinghy to head back to shore but wasn't seen again.