A cousin of slain Perth man Patrick Slater has called for violence amongst aboriginal people to be addressed after five men and a teenage boy were found guilty of his murder.

The group stood trial for 29 days in the Supreme Court of Western Australia accused of murdering the 26-year-old near the Esplanade train station in the hours after Australia Day celebrations on January 27, 2016.

Another boy, the youngest of the group, is accused but did not stand trial.

Clinton Mead, Christopher Birdsall, Dylan Anthony, Robert Pickett, Stefan Mead and a juvenile boy were all found guilty by the jury, with some of the group shaking their heads as the verdict was read.