Is this the end of the sushi conveyor belt? 'Sushi terrorism' forces four of Japan's 'big five' restaurants to scrap self-service after viral videos showed customers rubbing saliva on food

Grim acts of ‘sushi terrorism’ has forced four of Japan’s ‘big five’ sushi restaurants to scrap self-service after footage showed customers rubbing their saliva on the dishes.

Conveyor belt-served sushi has long been a favourite among diners, but is now feared to be on the way out due to some customers’ gruesome behaviour.

Leading restaurants in Japan that use the kaiten – or rotating – serving system are being forced to switch to more traditional methods of serving their raw delicacies as a…