Carnival (NYSE: CCL) (NYSE: CUK) is kicking off the new trading week with disappointing financial results, sending the stock to fresh 52-week lows on Monday. The world's largest cruise ship operator posted its fiscal second-quarter results ahead of the market open. The quarter itself was solid, but weak guidance scared investors worried about looming softness and cost controls. Revenue rose 10.4% to $4.357 billion, just below the 11.6% uptick in the fiscal first quarter that was celebrated as Carnival's strongest top-line growth since the summer of 2011.