Last Pearl Fisher, The

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20040329Pearls adorn Scotland's history from crown jewels to folk history.|But after centuries of fishing, Scottish freshwater mussels are now so rare they've been given legal protection.|Unscrupulous poachers are blamed for much of the damage, but fishing is not the only threat to the mussels.|Their ability to recover is hampered by polluted waters and painfully slow reproduction.|Jane Franchi visits the riverbank, hears the science and dips into the history of one of Scotland's great natural treasures.