NIIGATA (Kyodo) About 7,000 fish died Friday in a water tank at an aquarium in Niigata after workers mistakenly poured in an antiseptic substance with too great a density.
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| Survivor: A turtle swims around in a water tank where about 7,000 fish died at Niigata City Aquarium on Friday. KYODO PHOTO |
Workers at the Niigata City Aquarium noticed the fish, including sardines, damselfish and rays, were dying around 10 a.m. in the aquarium's largest water tank, about 30 minutes after the substance was added.
The workers added the antiseptic as the water had looked dirty. The density was believed to be greater than the correct level.
The aquarium keeps more than 20,000 fish, penguins, dolphins and other sea animals.