Mahalia Murphy and Australian Wallaroos thrashed by New Zealand

It was a tough day at the office for Mahalia Murphy on Saturday.

The Campbelltown Harlequin and her Australian Wallaroos teammates were thrashed 47-10 by the New Zealand Black Ferns at Perth's Optus Stadium.

The result means that the Aussie women are yet to win a game against the Black Ferns.

New Zealand burst out of the blocks to take a 22-0 lead into the half-time break.

The Buildcorp Wallaroos managed two second half tries via winger Lori Cramer, but the Silver Ferns pushed on to secure a 37-point win.

Wallaroos captain Grace Hamilton told the loss was "gut-wrenching".

Hamilton said the Wallaroos would need to improve ahead of the second match in the series on Saturday, August 17 in Auckland.

"It's disappointing, but I think the biggest thing is we learn from this and fire into next week," she said.

"Defensively we didn't value the ball enough when we had it and we turned it over easily. That is something we need to work on.

"We need to value that ball because that is the way we get momentum. We played into their [New Zealand's] hands."

Saturday marked Mahalia Murphy's fifth outing in the green and gold.

The fullback, 25, represented Australia in two Test matches and played a key role in the Wallaroos' 2-0 series win over Japan last month.