If you read the treaty along with the court ruling at least once you would know all fish swimming in the treaty waters are legal fish. The treaty does not have an expiration date. The treaty ensures the tribal members the rights. If for some reason fish numbers get low it’s the DNRs job to ensure tribal members will have fish for their needs if that means a big cut we all know which group that cut will come from. It will come from the only group the DNR has enforcement control over.
The Treaty of 1836 was signed by the United States, via the representative, with tribal "chiefs". Nowhere, is the State of Michigan mentioned as a signatory, largely because Michigan did not achieve statehood until January 26th, 1837.
The Great Lakes fishery is managed under the International Joint Commission (IJC) umbrella via the Great Lakes Fishery Commission which is a joint tribal, State, Provincial aggregate whose guiding principles are summarized here:
Four important principles guide this cooperative fishery management process: consensus, accountability, information sharing; and ecosystem-based management. Fishery management happens for each lake through "lake committees" comprised of state, provincial, and U.S. tribal agencies with primary management jurisdiction on each lake, supported by federal agencies. Lake committees develop strategic fishery management goals for each lake, called Fish Community Objectives (FCOs) and set agreed-upon harvest levels for key fish species of common interest. More detailed management guidance is provided through rehabilitation plans and management plans for each lake. Lake committees also provide a "state-of-the-lake" report every five years to summarize recent trends in fish populations and progress toward FCOs. Mutually agreed-upon management actions are implemented by individual agencies.
Source Great Lakes Fishery Commission Treaty of 1836 summary agreements pdf
Although the tribes retained the right to fish in the Great Lakes, conflicts among tribal fishers, state licensed commercial fishers, and sport fishing groups continued. In 1985, the tribes, the state, the U.S. Department of the Interior and various sport fishing organizations entered negotiations. The U.S. District Court ordered a 15-year agreement called the “Consent Order” into effect in 1985. The Order, which expires in 2000, allocates fishery resources between user groups. Its purpose is to reduce social conflict while conserving and enhancing valuable fish stocks. It also established a mechanism to resolve disputes by the formation of an Executive Council. COTFMA-member tribes’ chairmen and a state and federal representative sit on the council. When the mechanism fails, the U.S. District Court steps in to resolve the conflict. A court-appointed Special Master may serve as arbitrator.
COTFMA member tribes jointly manage their fishery resources via the Chippewa, Odawa, Resource Authority (CORA)
Overall, this information seems to be at-odds with your interpretation and contentions...