Five oil and gas service companies are awaiting decisions by the National Marine Fisheries Service on their proposals for Atlantic offshore seismic surveys that could harm whales and other marine life.

The service, which can issue authorizations under the Marine Mammal Protection Act, is reviewing a high volume of opposing and supporting public comments that were filed by the July 21 deadline.

The five companies are TGS NOPEC Geophysical Co. ASA, Spectrum ASA, ION Geophysical Corp., CGG S.A. and WesternGeco...