HOUSTON, May 9 (Reuters) - Oil refiner Citgo Petroleum on Thursday reported its first quarter net fell 56% to $410 million, from $937 million in the same period a year ago.

The Venezuela owned company said it throughput rose to 830,000 barrels per day, the third highest in its history, up from 814,000 bpd in the year-ago quarter. Its average crude utilization rate was 95%, the company said.

"We achieved these results with turnaround activities underway at two refineries while successfully restarting two offline units that we believe will further enhance our crude processing capabilities," CEO Carlos Jorda said in a statement. (Reporting by Gary McWilliams)