Yes, that is unique to Quebec. These are local associations that are close to the rivers.
Let's take the city of Gaspé as an example; a group of citizens there can indicate that it is interested in managing the fishery in the rivers there. It then signs a contract with the Government of Quebec, who gives it the power to collect the daily fishing fees. In return, it has the obligation to hire salmon conservation officers for the rivers, and to offer services to the fishermen.
This way of managing is very different in Quebec. It is more costly for Quebeckers to fish. However, the salmon is better protected.