BY ADAM H. BEASLEY

By Adam H. Beasley
Miami Herald

Denise Herzing used to love starting her mornings at sea with a dip in the reef-protected waters off Grand Bahama.

When she was out on dolphin-observation trips near Memory Rock -- off the island's West End -- the marine mammalogist would anchor in a spot that was usually safe from predatory sea animals.

But those swims ended a few years back when unexpected guests crashed the party. More than a half-dozen lemon sharks began circling her boat, conditioned by humans to associate people with food.

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