A Flimby man pleaded guilty to stealing over £11,000 over three years while working at the Lake District Coast Aquarium in Maryport.
Scott John Lister, 29, of Flimby Brow, appeared before West Cumbria Magistrates Court on Friday.
He pleaded guilty to stealing money from Mark Vollers between June 2008 and November 2011.
He will be on bail until May 27, when he will be sentenced at Carlisle Crown Court.
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