Supersaturation occurs when an amount of substance in a solution exceeds what is necessary, the Times reported.
In its release, ZooTampa officials said it will not reopen its 16,000-gallon exhibit, WTVT reported.
All 12 deaths happened suddenly, and initial tests did not reveal anything wrong with the water, according to the Times.
ZooTampa officials said it had sent water and tissue samples to Triton labs in Dusseldorf, Germany last week, WFLA reported.
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