The cruise operator Royal Caribbean­ Cruises Ltd. fell after reporting a quarterly loss related to its Spanish line, Pullmantur. Prices and bookings have plunged since the Spanish government imposed strict austerity measures, limiting the ability of Spaniards to spend. The Miami­ company, which operates the world’s second-largest cruise line, lost $392.8 million in the fourth quarter. But strong US demand is offsetting European losses, the company said.