(ShareCast News) - AIM-listed explorer Ithaca Energy has started production at its Stella oil field in the North Sea.The company said that production has been started from the field along with oil exports to the adjacent shuttle tanker.A ramp-up in production will start when the on-going commissioning of the gas processing and compression facilities has finished.Shares in Ithaca Energy were down 0.57% to 117.08p at 0919 GMT.