Te Roroa kaumātua earlier placed a rāhui on the area and have asked people not to fish or gather shellfish along part of the west coast between the Waimamaku and Waipoua rivers.
The rāhui starts south of Waimamaku River at Motuhuru and extends to Koutu Pt near Kawerua.
It will remain in force until further notice.
It is just one month since the last diving-related death in the area.