A group of North Island west coast hapu is totally opposed to any seabed mining off its coastline.
An application by Trans Tasman Resources to take 50 million tonnes of sand from a 65-square kilometre area in the South Taranaki Bight is being heard by the Environmental Protection Authority.
Nga Hapu o Te Uru co-chairperson Angeline Greensill says seabed mining is destructive and totally unnecessary.
She says Maori have a history of customary people who rely on fishing and gathering food from the sea.
Ms Greensill says anything that affects marine species affects Maori.
She says if a licence to mine the seabed is granted it will open a flood gate for other applications right along the west coast.