Hook – the star of Wales’ RBS 6 Nations campaign – crossed on the half-hour mark but early tries from Dragons' Will Harries and Matthew Watkins had already done the damage.

Jason Tovey opened the scoring with a penalty after just 90 seconds for Dragons before Harries made the most of a splendid cross field kick from Tovey to score in the corner.

But Ospreys responded with a penalty of their own from Dan Biggar mid way through the half and on 30 minutes Hook crossed with Biggar converting to narrow the gap to just one point.

The Dragons hit back just before the break, first with a penalty from Tovey then a try from powerhouse centre Watkins, which Tovey converted to give his side a 21-10 lead at the break.

The hosts were determined not to be pegged back and were rewarded on 56 minutes when Aled Brew breached the Ospreys defence to go over after patient build-up.

The Ospreys seemed to come alive after that and they attacked relentlessly in the last 20 minutes, grabbing a converted try through Bishop after good work by Nikki Walker.

But it came too late for them to push for a losing bonus point as the Dragons held on for the victory.