Image copyright AFP Image caption The Taiji hunt, seen here during the 2014 season, has received widespread criticismJapan has started its controversial annual dolphin hunt in the coastal town of Taiji.
The hunt sees the animals driven into a cove where most are slaughtered for their meat with knives in shallow waters.
The Taiji hunt has been carried out for decades and gained global attention when it was the subject of the Oscar-winning documentary The Cove in 2009.
According to environmentalist group The Dolphin Project, five Risso's dolphins were killed on Monday.
Japan has already come under criticism this year for resuming commercial whaling after it left the International Whaling Commission (IWC).