The United States is now requiring proof that the seafood it imports is harvested in ways that minimize harm to marine mammals.

The move is the first phase of a multi-part program that will be fully implemented by 2022.

As of Monday, countries had to submit a list of fisheries measures in place to limit by-catch and gear entanglements with whales, turtles, porpoises and seals.

The US wants other countries to require standards comparable to those imposed on American fisheries.

The new regulation took effect Jan.