If kaitiaki have been formally appointed for your rohe, they can give you written permission to gather kaimoana for tangihanga, hui, koha or any other traditional purpose that they specifically decide.
Fisheries (Amateur Fishing) Regulations 2013, reg 50(1)(a)
If no kaitiaki have been formally appointed for your rohe, written permission from representatives of local tangata whenua can only be given for gathering kaimoana for hui or tangihanga.