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Tokyo Sea Life Park Aquarium staff are currently baffled. Of the 160 Bluefin Tuna which have lived in the exhibit up to November of last year, only one fish is left alive as of Tuesday. An investigation is under way to try and figure out why the Tuna are perishing at such astonishing levels. Lighting, noise vibrations, toxins, and water quality are being studied to see if there is any potential risk factors. There was a virus detected in the examined dead fish, but it wasn’t the type to cause fatal deaths. Tokyo Sea Life Aquarium created a Tuna breeding program which was started over two decades ago, in 1989, with the intent to ‘reproduce aquatic habitats in the world’. Tuna have been kept in the aquarium since then. It was only as of November of last year that the Aquarium ever noted the tuna dying in such vast quantities. Bluefin Tuna are an endangered species, mostly due to over fishing of the ever popular sushi cut.MORE →