Trout, deer, pigs and other exotic species would have to be culled from the Ureweras under a law change before Parliament, fishers and hunters are warning Government.
Fishing and gaming associations say that in the Te Urewera-Tuhoe Bill, the emphasis on exterminating introduced animals from the Te Urewera region appeared to have increased in importance.
As part of the Crown's unique Treaty of Waitangi settlement with Tuhoe, Te Urewera would be legally owned by nobody but jointly controlled by the iwi and the Crown.
In New Zealand's national parks, the Conservation Authority had discretion over which plants and animals were "exterminated" to protect native species and bush.
Fish and Game Council chief executive Bryce Johnson said it appeared that a new board which would manage the Ureweras did not have the same discretion.