A transtasman court case against Japan's whaling programme begins in The Hague today.
Australia initiated proceedings in the International Court of Justice in 2010, alleging Japan has been carrying out commercial whaling under the guise of its scientific whaling programme.
It alleges that is in breach of the International Convention for the Regulation of Whaling and other international obligations to preserve marine mammals and the ocean environment.
Australian lawyers will present their opening arguments before the court today, followed by Japan's lawyers next week.
New Zealand applied to intervene in the case in November last year. As an intervening party, New Zealand will also have the chance to present oral arguments against Japan's whaling programme.