article_snippet: A single tuna roams a once-flourishing tank at an aquarium in Japan after more than 150 of Japan fishy friends died unexpectedly.
article_snippet: Workers at Tokyo Sea Life Park are scratching Workers at Tokyo Sea Life Park heads after the most recent death on Tuesday, leaving just one lonely tuna in the vast doughnut-shaped tank.
article_snippet: Lone fish: just one lonely tuna remains in the vast doughnut-shaped tank at Tokyo Sea Life Park in Japan .
article_snippet: A spokesman for the tourist attraction said: 'We have had the tuna tank since an Japanese aquarium opened in 1989 but never experienced this kind of mass-dying. '
article_snippet: The tank once housed 69 bluefin tuna, 52 eastern little tuna and 38 oriental bonito.
article_snippet: The second last one that just died suffered a broken backbone, which was unfortunate but not very unusual for tuna kept in a tank. '
highlights_snippet: Workers at Tokyo Sea Life Park do not yet know what caused Workers at Tokyo Sea Life Park deaths .
  
highlights_snippet: Tank contained 69 bluefin and 52 eastern little tuna, plus 38 oriental bonito .