Why is fishing for some kinds of ocean fish controlled by laws?

A Laws are needed to limit the growth of fish populations

B people who fish need to know where the fish are

C kinds of fish that are overfished could become extinct

D laws prevent people who fish from polluting the ocean

C is the answer. Due to the current state of the world economy; people, if left to their own devices, would fish as much as possible so they can sell their fish to make money. Current technology means we can catch as many fish as we want (trawlers etc.). The problem with this is that there is only a finite amount of fish in the sea. If we were to fish them without limits in place, we could cause them to go extinct.