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.
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.