An American blue crab took over Italian lagoons. Now fishers are looking for new careers.

By Kasha Patel, Chiara Negrello, CNN Scardovari, Italy (CNN) — As the sun was rising, two fisherwomen dragged their boat through the Scardovari lagoon in northeastern Italy. Oscarina Soncin stood in one of the largest clam-harvesting sites in Europe — the frigid water lapping against her knees as she scraped the seafloor with a metal