COPENHAGEN—The Faroe Islands said on Thursday it would review regulations governing its centuries-old tradition of hunting dolphins after graphic footage of the slaughter of a record catch of hundreds prompted an outcry. More than 1,400 Atlantic white-sided dolphins were herded into shallow waters by boats and jet-skis then killed on a beach on Sunday, the Sea Shepherd Conservation Society campaign group said. The U.S.-based organization released footage showing people turning the water red as they cut some of the dolphins with knives. It described the hunt as “brutal”. The Faroe Islands has defended its tradition—known as the grind (or Grindadrap in Faroese)—of shoring up pods of dolphins or whales and slaughtering them on beaches for decades. But the government of the North Atlantic archipelago said in a statement on Thursday the latest catch had been “extraordinary” due to the size of the pod and it would look into regulations around …