Canadian zoo investigates puzzling stingray deaths

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A mystery is surrounding the death of stingrays at the Canadian zoo... The juvenile cownose stingrays, about the size of a dinner plate, were kept in a "petting" tank where visitors were able to touch them, a common feature in a number of North American zoos and aquariums, according to the zoo officials in the Western Canadian city. On Sunday, within a few hours of opening, the normally voracious fish lost their appetites, became discoloured and started dying, with 34 of the 43 rays quickly succumbing to an ailment or cause that has yet to be diagnosed. What is killing them? Do you have any idea? Read more: http://news.yahoo.com/s/nm/20080514/od_uk_nm/oukoe_uk_zoo;_ylt=AuohLmg1AYrTNOEjZqrjgqftiBIF