Japan's online commerce giant Rakuten's President Hiroshi Mikitani (AAP) Japan's online commerce giant Rakuten's President Hiroshi Mikitani (AAP)

Japanese e-commerce giant Rakuten says it has told online retailers to stop selling whale meat after a UN court ordered an end to the country's Antarctic whale hunt.

The move - which also includes a ban on dolphin meat sales - comes as Japan said on Thursday it was cancelling this year's hunt for the first time in more than a quarter of a century to abide by the decision of the United Nations' Hague-based International Court of Justice this week.

Australia, backed by New Zealand, hauled Japan before the international court in 2010 in a bid to stop the yearly campaign, which has attracted widespread condemnation outside Japan.

"We issued a notice to all stores on April 1, asking them to stop sales of whale meat products by the end of the month," a Rakuten spokeswoman said.

"We made the decision ... following the ruling by the International Court of Justice and a subsequent comment by the Japanese government that it will obey the ruling," she added.

The notice was issued to about 42,000 online shops that operate on Rakuten's digital marketplace, she said, adding the company did not have a figure for how many sold whale meat.

A search of the site on Friday turned up about 700 listings for whale meat products. There were no listings for dolphin meat.

Tokyo had been widely criticised for using a legal loophole in a 1986 whaling ban that allowed it to continue slaughtering the mammals, ostensibly so it could gather scientific data.

However, it has never made a secret of the fact that whale meat from these hunts often ended up on dining tables.

Rakuten's move to ban the sale of whale-meat products appeared to go above and beyond the ruling, which said that Japan's hunt in the Southern Ocean was a commercial activity disguised as science.

The judgment did not affect whales hunted as part of Japan's coastal whaling program or in the north Pacific.