This weekend the yearly event kicked off in Taiji, a town in the south of the country.
The hunt started rather unsuccessfully on Sunday when, Japanese media reported, boats returned with no dolphins.
(Image: @dolphinangels1/Twitter)Paul Watson, a boat captain with charity Sea Shepherd which monitors the Taiji hunt, said: "We equate the killing of a dolphin with murder.
Japan has already come under criticism this year for resuming commercial whaling after it left the International Whaling Commission.
Commercial whaling ships left port on 1 July this year and the first whales have already been killed and sold.