Iwi leaders want to convince the Government not to go ahead with a bill forcing iwi fisheries to adopt new rules regarding foreign charter vessels.
About 60 iwi chairs will discuss the bill at the Iwi Leaders Forum hui in Te Kuiti on Friday.
The legislation ensures foreign-owned fishing vessels in New Zealand waters adopt this country's safety and labour laws by May 2016.
The aim is to stop maltreatment and low payment of crews on foreign charter vessels.
Iwi fisheries with treaty settlement quota initially had a four-year extension to adopt the rules but the Government has scrapped that.
Ngati Kahungunu authority chair Ngahiwi Tomoana said the move would diminish iwi fisheries settlement by between 20 and 30 percent.
He said the new rules would damage Maori economies and was a modern breach of the Treaty of Waitangi.