The rāhui prevents people from fishing, netting and taking shellfish.
Police previously appealed for sightings of the man, who is understood to have been wearing a wetsuit and pink swim cap while going for his daily swim at Onerahi.
Police, Coastguard and Surf Live Saving New Zealand were involved in the search and the police Eagle helicopter was also deployed. However, the search has since been scaled back.
In a media release, police said they have been in touch with the man’s family and support is being provided to them.
If someone has seen the swimmer, has any dashcam footage from the area or has any further information, they can update police online or call 105, referencing file number 241021/1742.
Brodie Stone is an education and general news reporter at the Advocate. Brodie has spent most of her life in Whangārei and is passionate about delving into issues that matter to Northlanders and beyond.