• The views of other parties to the Convention have been considered and taken into account before the Special Permit is issued.
The New Zealand Government has contended the Japanese scientific programme in the Antarctic did not meet these criteria and was therefore illegal, IFAW said.
IFAW Global Whale programme director Patrick Ramage said Japan's scientific whaling was merely commercial whaling by another name.
"In the court of public opinion, the verdict is already in.
"Commercial whaling, whether conducted openly or under the guise of science is a cruel and outdated practice which produces no science of value," he said.
Judgement in the case was not expected to be made for a few months, but Mr Ramage urged Japan to call an end to its Antarctic whaling and avoid further "embarrassment and damage to its international reputation".
Since the global moratorium on commercial whaling was introduced in 1986, Japan has killed more than 14,000 whales in the name of science, the vast majority of these in the Southern Ocean, he said.