SCARBOROUGH  — The Hannaford supermarket chain says all seafood sold in its 181 stores in the Northeast is now documented as sustainable.

The Scarborough-based chain says under its new policy, it documents all seafood products as coming from fisheries governed by effective, science-based management plans.

Hannaford’s George Parmenter told Maine Public Broadcasting Network the policy has resulted in the removal of about 50 seafood products from its stores, all from overseas suppliers. He said other suppliers have improved their harvesting practices to come in line with company standards.

Besides Maine, Hannaford has stores in Massachusetts, New Hampshire, New York and Vermont.

The policy will soon be adopted by all 1,400 U.S. stores owned by parent company Delhaize, which operates Food Lion stores in the Southeast and Sweetbay in Florida.