Fisheries are places where people go to catch fish. It's like a big swimming pool or a lake where fish live. People use different kinds of tools to catch fish, like fishing rods, nets or traps.
Some people catch fish just for fun or as a hobby. But other people catch fish for their job. They sell the fish to make money or they eat the fish for food.
People who catch fish for a living need to take care of the water and the fish. They need to make sure that they don't catch too many fish at once or the fish will disappear. They also need to make sure that the water is clean and safe for the fish to live in.
If too many fish are caught or the water is not clean, it can be bad for the fish and for the people who rely on them for food and money. So, it's important to manage fisheries so that the fish population stays healthy and sustainable for a long time.