The retailer said the move is "vital" for preserving the fish, which are sometimes harvested with the use of beam trawls, a fishing method that has come under fire as damaging by environmental groups.
Asda said it is the only major supermarket to ban the fish, noting Waitrose and Sainsbury's both carry the fish.
Asda called out three of Britain's top celebrity chefs -- Rick Stein, Jamie Oliver and Gordon Ramsay -- to join in the boycott, noting the fish is on the menus of all three of the men's exclusive restaurants.
Oliver
