Okay, so you know how we sometimes catch fish to eat or sell? But if we catch too many fish, there won't be enough left for later. This is a problem because fish are important for our food and for the environment.
To make sure we don't catch too many fish, grown-ups sometimes work together to manage the fishing. This is called fisheries co-management.
It's like when you and your friend share a bag of candy. You both agree to only take a certain amount of candy so that you can share and have some left over for later.
In fisheries co-management, the grown-ups who fish and the people who take care of the fish and the ocean work together to make rules and decisions about how many fish can be caught, where, and when. They help each other understand how the fish are doing and what's happening in the ocean.
By working together like this, they can help make sure there are enough fish for everyone and for the future.