You know how sometimes mommy and daddy make rules and tell you and your siblings to follow them? Nafo (which stands for Northwest Atlantic Fisheries Organization) is like a group of grown-ups who do the same thing for fishermen who catch fish in the ocean.
They work together to decide which fish can be caught, how many, and where they can be caught. This is to make sure there are always enough fish in the ocean, so that we can still have yummy fish to eat in the future.
The members of the nafo group are made up of different countries, like Canada, the United States, and others. They get together and talk about how things are going with the fish in the ocean, and come up with plans on how to protect them.
So, nafo is like a team of people who want to make sure there are always plenty of fish in the ocean for everyone to enjoy.