Last week the national fast food chain Tenya, which specializes in tempura dishes, announced that it was discontinuing two of its most popular menu items effective Oct. 20: jotendon (¥580) and ebiten soba or udon (¥790). Both dishes feature prawns deep fried in batter — the former offers two big prawns on top of a bowl of rice, and the latter one big prawn in a bowl of either soba or udon noodles. The reason for the move is the skyrocketing price of shrimp. As a concession, Tenya will continue serving tendon (¥500), which only features one fried prawn on a bowl of rice, and introduce ebi oika tendon (¥590) — one prawn and one slab of squid on rice.

Tenya's parent company, Royal Holdings, said in a statement that the Southeast Asian shrimp farms from which it buys its prawns have been hit with a disease called early mortality syndrome (EMS) that has decimated stocks, the result being that prices have doubled. The EMS plague affects shrimp prices all over the world, especially in the U.S., which consumes more shrimp than any other country. Since most shrimp farms are, almost by definition, ecologically destructive, the spread of disease is hardly surprising, and it isn't certain if the industry will be able to recover.

That's a serious problem for Japan, where shrimp, or ebi, has a special place in the national cuisine. Before the 1980s, tendon using prawns was considered an extravagant dish for the average Japanese person, and it remains one of the most popular meals to this day, beloved by all classes of people. Tendon is by far the most popular item on Tenya's menu, with the now discontinued jotendon in fourth place, according to a recent report on TV Asahi. Moreover, the kaiten sushi (conveyor belt sushi) chain Sushiro has also announced that it will be suspending sales of many dishes that use shrimp due to the "worldwide shortage." Family restaurants and convenience stores will also cut back on the number of products they sell that feature ebi.