Western Force duo Scott Fava and Richard Brown have been found guilty of mistreating quokkas and fined A$11,000 and A$5000 respectively.

The RugbyWA misconduct committee found the pair had breached the Force's serious misconduct protocol in regards to their behaviour towards quokkas at Rottnest Island last Friday.

Western Australia police and the Rottnest Island Authority launched inquiries this week after it was alleged that the Force players were "hammer throwing" quokkas, a protected animal, last Friday during the team's pre-season camp on the island near Perth.

A Western Force misconduct committee on Monday concluded that no player mistreated a quokka, however four players admitted to picking up quokkas and putting them down whichis against island regulations.

In a statement from RugbyWA, it said: "The Committee found that both players had been drunk in public, behaved anti-socially and inappropriately handled quokkas.

"The Committee found that neither intended to cause any harm to the quokkas."

Former Wallaby Fava was additionally ordered to undertake seven days community service and counselling for alcohol abuse with Brown also made to undertake seven days of community service.

Following the disciplinary ruling the Australian Rugby Union released a statement reading:

"The Australian Rugby Union supports the decision by RugbyWA to sanction two Western Force players in relation to incidents at Rottnest Island last Friday night.

"The ARU agrees the players' behaviour was unacceptable and extremely disappointing, and in breach of the standards expected.

"The ARU is pleased that RugbyWA acted quickly to re-open an investigation into allegations of misconduct, after receiving further information from witnesses.

"The ARU is also satisfied that RugbyWA has dealt with this matter appropriately and with due process."