The Campbell Soup Company reported today that its first-quarter profit fell 6 percent. The company said higher sales of snacks were more than offset by a sharp drop in soup sales compared with a year ago. The results beat Wall Street estimates. Net income was $161 million, or 39 cents a share, for the three months that ended on Oct. 27. A year earlier, the company, which is based in Camden, earned $171 million, or 42 cents a share. Excluding a one-time charge of $31 million, Campbell earned $192 million, or 47 cents a share. That topped the estimate of 44 cents from analysts surveyed by Thomson First Call. The charge was to cover the decline in value of a business Campbell bought in fiscal 1999, Stockpot, which makes fresh and frozen premium soups. First-quarter revenue totaled $1.71 billion, down 1.4 percent from $1.73 billion in the period a year ago.