This win means Perpignan and England's Worcester Warriors still have genuine ambitions of qualifying for the tournament's quarter-finals with the final game of the pool still to play.

Both teams cannot yet be separated on points but only one of them can qualify even if they stay level after the final game of the Pool. The number of tries scored in their head-to-head games will then come into play and Perpignan have a 3-1 try advantage over the Warriors.

Lifeimi Mafi, Perpignan's former Munster centre, prop Jerome Schuster and wing Armand Batlle all crossed for a brace of tries apiece in the seven-try victory on late Saturday afternoon.

Prop Schuster crossed for the first of his two first-half tries in the third minute but the floodgates never really opened for the Top 14 team against a resilient Bizkaia side.

Wing Batlle and scrum-half Florian Cazenave also crossed for first-half tries to give the Catalans the bonus point and a 33-15 lead at half-time, but they only managed three tries by Mafi, replacement Farid Sid and Batlle again in the second half.

Bizkaia, who have no chance of a quarter-finals place in the tournament, have mustered two victories from their five matches in their debut season of European rugby.