April trade volumes were essentially flat versus the prior month and the prior year, after rebounding from February's sharp declines, say U.S. cargo and port officials. Their reports suggest no further narrowing of the trade gap for the time being from February's dramatic drop -- as imports firmed through March and April, while exports were mixed at best. Steady import flows also broadly suggest no consumer downturn since the latest comparisons are to a year ago, when domestic economic activity was at a peak, they add. The nation's two largest ports, Los Angeles and Long Beach, showed no real consistency in the quantity of goods entering and leaving.