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Study unlocks history of the seas

Medieval fishermen first took to the open seas in about AD1,000 as a result of a sharp decline in large freshwater fish, scientists have suggested.

They say the decline was probably the result of rising population and pollution levels.

The study forms part of a series that examines the impact of humans on life beneath the waves throughout history.

The findings will be presented at a Census of Marine Life (CoML) conference in Canada, which begins on Tuesday.

Read entire article at CNN