Over 80% of Tuna died since December in a major Tokyo aquarium

81% of Tuna have died in an aquarium of eastern part of Tokyo since the beginning of December.

It’s “Tokyo Sea Life Park” run by Tokyo Metropolis, which is the most popular aquarium in eastern Japan since opened in 1989. There were 69 Bluefin tuna, 52 Kawakawa and 38 Striped bonito by 11/1/2014, however they decreased to only 17, 4 and 9 in this order by 1/14/2015. In total,  129 of 159 tuna died since December.

The aquarium states it can happen that some of the fish die just after transferred to a glass tank, but they haven’t experienced such great scale of death to happen rapidly.

They administered medicine, eliminated what can potentially cause stress such as change of light, noise and vibration on advice of experts, however because they couldn’t stop the death increasing, they announced this in public before pathological diagnosis.

The glass tank has 7 m depth, 30 m diameter and 2,200 t of water.

The cause hasn’t been identified yet.






Français :

Depuis décembre dans un des plus grands aquariums de Tokyo plus de 80% des thonidés sont morts


81% des thonidés sont morts dans un aquarium de l’Est de Tokyo depuis début décembre.

Il s’agit du “Tokyo Sea Life Park” géré par la Métropole de Tokyo qui est le plus populaire des aquariums du Japon oriental depuis qu’il a ouvert en 1989. Au 1er novembre, on y trouvait 69 thons Bluefin, 52 Kawakawa et 38 bonites rayées, cependant, ils sont descendus à respectivement 17, 4 et 9 au 14 janvier 2015. Au total, 129 des 159 thonidés sont morts depuis décembre.
L’aquarium affirme qu’il peut arriver que certains poissons meurent juste après un transfert dans un aquarium mais ils n’avaient jamais connu une telle hécatombe aussi rapide.
Sur les conseils d’experts, ils ont administré des médicaments, éliminé ce qui pouvait provoquer du stress, comme le changement de lumière, le bruit et les vibrations, néanmoins, ils ont annoncé ceci publiquement avant les autopsies parce que ça ne suffit pas pour enrayer l’hécatombe.
L’aquarium fait 7 m de profondeur, 30 m de diamètre et contient 2 200 t d’eau.
La raison n’est toujours pas établie.


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I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
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January 2015