A deal between New Zealand fishing company Sealord and 37 iwi groups is a "watershed moment" for Māori fisheries, an industry leader said, reports Stuff.

The Nga Tapuwae o Māui agreement was signed on Tuesday as a precursor to this week's Māori Fisheries Conference in Auckland.

It will give Nelson-based fishing company Sealord access to the annual catch entitlement (ACE) of 37 of the country's 58 iwi groups in a deal set to increase efficiencies and see more than 80 percent of profits returned to iwi.