"For us it's about respecting our foreshore and seabed and keeping with sustainable practices that preserve our taonga and moana. We're not going to allow all that machinery to come down onto the beach any more," he said.
"This has always been our pātaka kai, our food basket. And the practice has a huge impact across Te Oneroa Tōhē."
The agreement had been reached amicably, and was a positive result, Te Rarawa chairman Haami Piripi said.
"We stand by our hapū in their decision to make a stand on this issue and will continue working with industry and iwi representatives to establish acceptable industry standards of practice in our rohe," he said.
Mussel spat harvesting is covered by the quota management system and a code of conduct set by Aquaculture New Zealand, which requires harvesters to avoid toheroa and tuatua beds, limit time on the beach, avoid areas of high public and cultural importance, and ensure all machinery is well serviced and not leaking fuel or oil.
Ninety Mile Beach provides 75 per cent of the spat for New Zealand mussel farms.
A new Te Oneroa a Tōhē Governance Board, set up as part of the Te Hiku Treaty settlement process, is currently developing a management plan for the beach which may include rules for commercial activities.
Hapū have asked that collectors no longer use mechanical harvesting methods south of Waipapakauri.