Detectives from the Marine Investigation Unit have released images of a man after a boat was stolen from Portarlington Pier in October.
Investigators believe the boat, named Merry Fisher, was stolen from mooring number six at Portarlington Pier between 12pm on 20 October and 7am on 21 October.
The boat was driven by an unknown person to Wyndham Harbour in Werribee South where it docked about 5.35pm on 21 October.
The boat was recovered by police however detectives are yet to identify the persons involved.
As part of their investigation, police have released images of a man who they believe can assist with their enquiries.
The man is described as Caucasian in appearance, aged between 20 and 30, about 172cm tall with short dark hair and tattoos on his left hand.
He was wearing white sunglasses, a red spray jacket, black trousers and black Nike runners with white soles. He was carrying a red re-usable shopping bag.
Detectives have also released images of the boat, in the hope someone may recognised the vessel or witnessed suspicious activity.
Anyone who recognises the man or with information is urged to contact Crime Stoppers on 1800 333 000 or make a report at www.crimestoppervic.com.au.