Police at Wedge Island after the New Year party. Picture: Bill Hatto/The West Australian

Australia Day partygoers will be stopped from going on to WA's ecologically sensitive Wedge Island, after a New Year's party there ended in an alleged murder.

The Department of Parks and Wildlife revealed it will conduct an operation at the beach, north of Lancelin, during the Australia Day long weekend, including vehicle- and visitor-screening at road blocks and patrols

Peter Sharp, DPaW's director of parks and visitor services, said the area could not cope with another influx of partygoers.

"Last year more than 4000 people gathered at Wedge on Australia Day. The area can't cope with this level of visitation and the illegal camping and anti-social behaviour that unfortunately comes with it," Mr Sharp said.

During the coming long weekend, any shack lessees will be allowed only one camping unit - a single tent or caravan - alongside each shack.

Camping in other areas of the reserve will be banned.

"Camping includes tents, caravans, camper trailers, swags and sleeping within, on-top-of or underneath vehicles," Mr Sharp said.

James Dorloff, 20, died after being attacked with a machete on the 400-metre-long Wedge Island, shortly before 1.30am on January 1.

Two other people also suffered injuries.

Joseph Robert Houston has been charged with murder, intent to do grievous bodily harm and unlawfully wounding another.