The ACT Government called for information from the public after 18 sections of wire fencing were cut open at Jerrabomberra Grassland West Nature Reserve over the weekend.

ACT Parks and Conservation director Daniel Iglesias said much of the damage was found near signs warning the areas would be closed from Monday night to allow for the shooting to go ahead.

“Unfortunately each year leading up to and during the kangaroo cull our reserves are targeted by vandals,” Mr Iglesias said.

“Fences are cut, locks are glued and signs are spray painted.

"This is very disappointing as it redirects funding and staff resources away from actually looking after the reserves and instead towards repairing vandalism."

He estimated the weekend vandalism would cost about $5000 to repair and said fines could be handed to anyone found damaging nature reserves in the ACT.

“While some in the community may not agree with the kangaroo conservation cull, it has repeatedly been demonstrated there is a strong scientific basis for it and activists have had the opportunity to challenge it in full ACT Civil and Administrative Tribunal hearings the last two years," Mr Iglesias said.

"I respect the rights of activists to protest, but ask that they please do so in a manner that does not damage public property."

ACT Parks and Conservation has remote surveillance cameras in operation at parks and reserves.

Last week, it was confirmed two shooters would cull 1606 kangaroos in eight nature reserves across Canberra after an appeal was thrown out from the ACT Civil and Administrative Tribunal (ACAT).

ACAT rejected Animal Liberation ACT’s appeal and found the government's cull had a “solid scientific basis".

It accepted the government’s contention that shooting the kangaroos was necessary to protect other threatened species that rely on the grasslands

Animal Liberation ACT spokeswoman Carolyn Drew said the group did not support acts of vandalism.

"As far as we're concerned, we don't know of our members having done such a thing," she said.

"This is to be expected because a lot of people who were counting on the tribunal to be more objective this year than they have been before, discovered they weren't objective at all from our point of view.

"Because of that, we're going to have individuals who take it upon their conscience to go and do what they think should be done."

Ms Drew said the organisation had a non-violent philosophy and would not support vandalism on nature reserves in the ACT.

A total of eight nature reserves will be closed in the evening and overnight from Monday until July 31 for the shoot.

They are the Callum Brae off Mugga Lane, Goorooyarroo and adjacent land in Gungahlin, Jerrabomberra Grassland West, Kama near Hawker, Mount Painter near Cook, Mulanggari in Gungahlin, Mulligans Flat in Gungahlin, and the Pinnacle and adjacent land near Hawker.

Most of the reserves will be closed from 3pm until 7am each day. Two sites, Mount Painter and the Pinnacle, will close from 5pm each day and reopen at 7am.

Anyone with information about the vandalism or suspicious behaviour should contact Crime Stoppers on 1800 333 000.