"Our fisheries are coming under constant pressure and offending on this scale puts that much extra unnecessary stress on a finite resource."
Fisheries officers saw the group diving at a reef at the northern end of Takou Bay and apprehended them as they headed back to their car about 4km away.
Mr Edwards said Northland paua offending was usually confined to remote reefs along the west coast between Kawerua and Ahipara, but recent activity like this suggested there was more apparent offending on the east coast.
The men, aged between 18 and 39, would be charged under the Fisheries Act and face fines of up to $250,000, as well as possible confiscation of dive gear and a vehicle.