Okay, so imagine you are at a party and there is a big bowl of your favorite candy on the table. You want to keep taking candy from the bowl, but your mom tells you that you need to make sure to leave enough candy for other people to enjoy too. This is kind of like what a fisheries law center does.
Fisheries law centers are places where people work on making rules and laws to make sure that we don't take too many fish out of the ocean. If we take too many fish out, there won't be enough left for the other animals in the ocean, and it could eventually hurt us too because we depend on fish for food.
So just like your mom tells you to share the candy, fisheries law centers help make sure that we share the fish in the ocean so that everyone can have a fair chance to catch them and there will always be fish for us to eat in the future. They also make sure that people follow the rules and don't catch too many fish.