Japan said Friday it would resume its whaling program in the Antarctic despite passage of a resolution opposing its hunt by the international body that oversees whales, terming the negative vote "regrettable."

The International Whaling Commission on Thursday adopted a resolution saying that Japan should abide by a ruling by the International Court of Justice earlier this year that its decades-old and disputed "scientific whaling" program was illegal and should stop.

The surprise March ruling was a blow to Japan, which maintains that whaling is an important part of its culture, and prompted it to call off its 2014-2015 hunt in the Southern Ocean. It still carried out a scaled-down version of its less known Northern Pacific hunt.

Participants at the Commission's biennial meeting in Slovenia passed the non-binding resolution by a 35-20 majority, a move that Chief Cabinet Secretary Yoshihide Suga said was "extremely regrettable."

"We are now carrying out preparations for a new plan for scientific whaling to resume in the 2015-2016 year, a plan that takes the International Court ruling into account," he said.

"Our actions are based on international law, scientific fact and the international whaling treaty."

Though anti-whaling nations say the IWC should be acting to conserve whales, Japan and its allies argue it was set up to manage them as a resource.

Japan has long maintained that most whale species are not endangered and began what it called scientific whaling in 1987, a year after an international moratorium came into effect, despite growing global outrage, including from key allies such as the United States.

Though few Japanese now eat whale, the government argues that the meat is a part of Japanese food culture.