The Fisheries Agency said the five-ship fleet finished its four-month expedition without major interference from anti-whaling activists who have attempted to stop it in the past.
Japan says the hunt was for ecological research. Research whaling is allowed as an exception to a 1986 international ban on commercial whaling. Opponents of the Japanese program say it's a cover for commercial whaling because the whales are sold for food.
The International Court of Justice ruled in 2014 that Japan's Antarctic whaling program should stop because it wasn't scientific as Tokyo had claimed. Japan conducted non-lethal whaling research in the Antarctic in 2015, and revised its program in 2016 by reducing the catch quota to about one-third of what it used to kill.
Officials said the whalers used parts of the whales to determine their age, nutrition, and reproductive conditions. Opponents say such studies can be done using non-lethal methods.
Kitty Block, executive vice president of Humane Society International, an animal protection group based in Washington DC, said Japan is needlessly killing whales every year. "It is an obscene cruelty in the name of science that must end," she said in a statement.
Protests by the anti-whaling group Sea Shepherd have also contributed to the decline.
Critics say it's a dying industry, but Japan's government has spent large amounts of tax money to sustain the whaling operations, saying it's a Japanese cultural tradition that must be preserved.
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