Sad News from the Calgary Zoo

[Delphinus]

I know other public zoos/aquariums have "touch" tanks and I don't know what kind of mortality they see, as a tourist in these places you'd never really know..

But the aquarist in me says when you see nearly 100% die off in a system in 24 hours, there are only so many explanations. The tank crashed, or, something was introduced. I don't know how sensitive rays are to ammonia/nitrite, but if the tank was crashing, I think the decline would be more gradual.

So I think something was introduced, either accidentally, or, maybe even deliberately.

Obviously a PR nightmare for the zoo, I don't know how you can pull out of this. Close the exhibit permanently? Or try again? Either option is going to make them look bad.

I feel just sick about this. 34 dead rays... I can't believe it. So very sad.