LONDON — After years of criticism from environmentalists, two top Japanese restaurants in London are now advising diners to avoid selecting the endangered bluefin tuna — but they are keeping the fish on their menus.

Environmentalists have slammed the compromise, saying the two restaurants in central London owned by famous chef Nobu Matsuhisa should take the dish off their menus entirely.

The contradiction was discovered by environmental journalist Charles Clover, who has been researching the demise of fish stocks and the response from the restaurant industry.