Zoo mystery on why sharks died may never be known

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Minnesota Zoo officals still don't know why the six sharks introduced to one of their new aquariums died. And today, they say they may never know the cause. The "Discovery Bay," exhibit is to be the largest and most expensive new attraction at the Apple Valley zoo since the zoo opened twenty years ago. That opening has now been placed indefinitely on hold amid efforts to find out what's wrong with the aquarium. Minnesota Public Radio's Mark Zdechlik reports.

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