More than 1,000 fish have died in a tank at a popular Tokyo aquarium due to oxygen deprivation.
An investigation has been launched at Sunshine Aquarium in Tokyo’s Ikebukuro district after 1,235 fish were found dead in its biggest tank.
The fish, which accounted for 94 per cent of all creatures residing in the 40-foot wide tank, were found by a security guard earlier this week.
Only 73 fish, including zebra sharks and stingrays, survived in the Sunshine Lagoon tank, which holds around 240 tonnes of water, according to reports.
The cause of the mass fish death is thought to be oxygen deprivation, after the stoppage of a bubble-generating tank cleaner hours earlier.
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