The Calgary Zoo is investigating the death of a large amount of fish.
The Zoo’s Larissa Mark says near half of the tilapia living in the hippo enclosure have died.
“Our staff recognized that the ozone sensor failed in the hippo pool in the Savannah building and as a result of this failure about 85 tilapia were lost due to the extra ozone in the water.”
Mark says there are still 100 tilapia living happily alongside the two hippos.
The hippo pool control system is pretty new–having been installed as part of the post-flood rebuild.