Stressed out aquarium shark dies of heart attack

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A blacktip reef shark that at one stage had to be removed from public view at a Russian zoo after suffering a 'nervous breakdown', has died of a heart attack.

A spokeswoman for the Kaliningrad Zoo said a post mortem had revealed that the shark suffered from cardiac disease.

The shark had gone back on display in February after undergoing treatment for several months for stress and damage to its nose and eye, sustained though charging into the sides of the aquarium during a panic attack. At the time, the public had been blamed for banging on the glass of the tank with their fists, despite requests not to do so.

It has not been confirmed whether the shark's heart attack and the nervous breakdown were connected in any way, but the zoo says it does not intend to house any more reef sharks.

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