The keepers at the Tropicarium brought down a tree adorned with seashells as well, Reuters reported. The tradition started years ago, biologist David Derbak said, designed to mark the feast day of St. Nicholas, which is Dec. 6.
The sharks are usually intrigued by the keepers' costumes, Derbak said.
The Tropicarium isn't alone in decorating its underwater seascapes for the holidays. At the Cattolica Aquarium in Italy, a nativity scene was set up last year among the sharks. Brigitte, a 3-meter-long, 20-year-old sand tiger shark, was especially interested in the proceedings.