The Pirates’ Isaak Conley was the only player to cross for the visitors as they again suffered at the hands of their local rivals.
It was better news in B-grade, with Mandurah downing Rocky 12-7 to jump to top spot.
Jason Regler and Jezreel Kasuas crossed for the Pirates in the five-point victory, extending their winning run to an impressive seven games.
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READ NOWThe news was not as good for the colts as they fell to ladder-leaders Palmyra 21-7 at Allen Park.
James Gardner scored Mandurah’s only try as Anton Pail grabbed a conversion in the 21-point loss.
Next week, Mandurah will host a home carnival, with the junior teams kicking off at 8am and all ages playing during the day.
The colts team will travel to Morley to take on Perth Bayswater, kicking off at 11:50am.
The B-grade team will take on Curtin uni at home.