P/>Shares of Chiquita Brands ( CQB) jumped 8% in after-hours trading Thursday after the company released first-quarter earnings that surpassed Wall Street's targets.Though the effects of a stronger dollar hurt revenue, which declined 10% from a year ago, the company said it earned $23 million, or 51 cents a share, far surpassing analysts' estimates of 28 cents a share, according to a survey by Thomson Reuters. A year ago, Chiquita said its earnings on a comparable basis were $22 million, or 49 cents a share. Revenue in the just-ended quarter was $842 million, down from $935 million a year ago. The Cincinnati company attributed the stronger-than-expected earnings to wider margins in its prepared-salads business and strong banana sales. Shares of Chiquita changed hands in after-market action at $8.21, up 64 cents, or 8.45%.