Jane Lubchenco, the administrator of the National Oceanographic and Atmospheric Administration, and Maria Damanaki, the European Union’s commissioner for maritime affairs and fisheries, announced the deal in Washington. The pact calls for cooperation on adopting effective management measures in regional and international organizations to combat illegal fishing and promoting tools that prevent illegal fishing operators from benefiting economically from their activities. The United States and the European Union will also share information on illegal fisheries and “promote the sustainable use of fisheries resources while preserving marine biodiversity,’’ the two sides said.

Policymakers argue that illegal, unreported and unregulated fishing — known as “I.U.U.” fishing or pirate fishing — makes a mockery of national and international laws meant to ensure fish stocks are managed in a sustainable manner.

‘‘Illegal, unreported and unregulated fishing is one of the most serious threats to American fishing jobs and fishing communities, as well as to the health of the world’s oceans,’’ Dr. Lubchenco said in a statement. ‘‘International cooperation across oceans will help us maintain a level playing field for our fishermen by strengthening enforcement and preventing illegal fishing.’’

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