In court documents, the Inuvialuit Game Council and the Gwich'in Tribal Council say the Yukon government's hunting restrictions on Porcupine caribou violates members' treaty rights. (CBC)

The Yukon government says it has a new plan to manage the Porcupine caribou herd, but will not release details until all parties sign on.

Environment Minister John Edzerza said the plan involves First Nation, territorial and federal governments in a bid to manage a caribou herd that wanders across territorial and national boundaries.

Edzerza suggested the controversial restrictions on hunting put in place last fall would be re-evaluated.

"Once all parties have signed, and the plan is ready for implementation, the Yukon government will revisit the interim conservation measures we put in place," Edzerza said Wednesday.

Those measures require hunters to report all caribou they kill in the Yukon, and to hunt bulls only. As well, licensed Yukon hunters are now limited to hunt just one bull per season.

Aboriginal hunters can hunt as many bulls as they want, but they are prohibited from killing cows in the hopes that more cows will produce more calves.

The Porcupine caribou herd is the largest herd in the Yukon, but government wildlife officials estimate the herd to have between 90,000 and 100,000 animals — only half the size the herd was 20 years ago.

Without hunting restrictions in place, the herd's numbers could be cut in half again before 2020, retired government biologist Doug Larsen said at the time.

The conservation measures are being challenged in court by several aboriginal organizations.