The Wales wing switched to the south of France in the summer and grabbed two tries against his former teammates.
Takudzwa_Ngwenya, Yann Lesgourgues, Raphael Lakafia and Eugene Van Staden scored also crossed the whitewash as the Dragons pre-season misery continued, with Tom Prydie slotting their only points.
Director of rugby Rob Beale admits the defeat was disappointing but reckons there is plenty to build upon ahead of Friday’s clash with London Irish.
“It was a tough game and we always knew that would be the case,” said Beale.
“We weren’t where we needed to be in the first-half and if you give a team like Biarritz those opportunities they will make you pay.
“There were very difficult conditions to play in, even when we kicked-off at 7.00pm it was over 30 degrees. But despite the score-line there were plenty of positives.
“Dan Evans at full-back was outstanding, Darren Waters had a great game at openside and Phil Price did a good job in the scrum.
“There were four or five chances of our own which we were unable to take. We worked hard to get into many of those positions but if you don’t cross the whitewash you don’t score.”
The Dragons woes were compounded after Rob Sidoli picked up a calf injury. It is not thought to be serious but he is unlikely to face the Exiles and with Adam Jones continuing his rehabilitation, Ian Nimmo is their only fit specialist lock.
Biarritz Olympique: Tries – Brew (2) Van Staden, Lesgougued, Lakafia, Gimenez; Cons (5)
Newport Gwent Dragons: Pen – T Prydie
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