Two people have been fined following an investigation into jet-skis destroying an Ospreys nest in the Georges River.
However, neither fine related to cruelty shown to the rare and protected birds, who had nested on a navigation pole.
A joint investigation by Roads and Maritime Services (RMS), police and the Office of Environment and Heritage (OEH) was launched after the attack on October 15-16.
An RMS spokesman said four jet ski riders had been identified.
“RMS has fined one rider $750 for riding unlicensed and failing to stay a safe distance away from a navigational aid, the pole the Osprey nest was on,” he said.
“The owner of this jet ski also received a penalty of $500 for permitting an unlicensed rider to operate his jet-ski.
“Another rider and his legal representatives will be interviewed early next week.
“The two other riders have not presented for the interviews RMS has requested.
“If they do not present by the end of this week further compliance action will be taken and RMS will look to issue court attendance notices.”
The Office of Environment and Heritage is responsible for offences against protected animals.
A spokeswoman for OEH said it was “working with a number of other service agencies as part of an investigation into the destruction of the Ospreys nest on the Georges River”.
“As this matter is part of an active investigation, it is not appropriate for OEH to comment further,” she said.
