Oxygen shortage kills 54 rays at US zoo


Editor's Picks
 A perfect place for your Fighter to rest his little fins — the Betta Bed Leaf Hammock.
Gear Post
Review: Betta Bed Leaf Hammock
21 November 2017
 Just look at that little face... No wonder then, that so many fishkeepers find these little puffers so hard to resist.
Features Post
Join the puffer fish fan club!
28 September 2017
 Special care needs to be taken when catching Pictus catfish and other species with spines.
Features Post
Travels with your fish
03 August 2017

More than 50 stingrays have died in shallow touchpool at an Illinois zoo after an equipment malfunction led to a drop in oxygen levels on Friday afternoon.

Staff at the Brookfield Zoo, located in the Chicago suburbs, noticed the rays behaving oddly after an alarm sounded on the system that regulates the tank's oxygen, ozone and temperature.

Oxygenation was restored to the Stingray Bay exhibit within 20 minutes due to the fast reactions of the staff, who added an air bubbler and submerged air pumps, but unfortunately the four Southern stingrays and 50 Cow-nose rays all died.

"We are devastated by the tragic loss of these animals," said Bill Zeigler, senior vice president of animal programs for the Chicago Zoological Society, which operates the zoo. "Our staff did everything possible to try and save the animals, but the situation could not be reversed."

Staff are currently analysing the life support system to determine the exact cause of the malfunction. The exhibit, which has been operating since 2007, will remain closed for the rest of the season.

Why not take out a subscription to Practical Fishkeeping magazine? See our latest subscription offer.

Don't forget that PFK is available in digital format for the iPad/iPhone and there's also an Android version on the Google Play news stand.