Gov. Kathleen Blanco late on May 5 vetoed a proposed offshore natural gas port over concerns that fisheries in the Gulf of Mexico could be harmed. Blanco had until May 7 to file any objections to a proposed federal license for the Main Pass Energy Hub, a liquefied natural gas terminal being sought by Freeport McMoRan Energy LLC, a subsidiary of New Orleans-based McMoRan Exploration Co. "Until studies demonstrate that the operation of the open rack vaporizer will not have an unacceptable impact on the surrounding ecosystem, I will only support LNG terminals using a closed loop system having negligible impacts to marine life," Blanco said in a letter sent on May 5 to Julie A. Nelson, acting deputy maritime administrator and chief counsel for the U.S. Department of Transportation.