FILE- Gulls follow a commercial fishing boat as crewmen haul in their catch in the Gulf of Maine, in this Jan. 17, 2012 file photo. TExecutive branch agencies will likely have more difficulty regulating the environment, public health, workplace safety and other issues under a far-reaching decision by the Supreme Court. The court's 6-3 ruling on Friday overturned a 1984 decision colloquially known as Chevron that has instructed lower courts to defer to federal agencies when laws passed by Congress are not crystal clear. (AP Photo/Robert F. Bukaty, File)