Commercial fishing would be banned from the inner Hauraki gulf and the entire Marlborough Sounds if National creates new recreational fishing parks for those areas.
Prime Minister John Key announced the creation of the new parks while at Westhaven Marina in Auckland this afternoon.
The parks, which will be a new concept created by a reform of current legislation, will cover the inner Hauraki Gulf and the entire Marlborough Sounds.
Mr Key said compensation would likely be paid to affected commercial fishers, which could cost up to $20 million.