This is a great activity for students to learn about overfishing, population and dangers of the sea. I have the students watch a couple of clips from Deadliest Catch on Youtube and then complete this activity. They need to know generally how to read a food web. They will graph their data and do a bit of economics as well.
This activity calls for the students to use straws and masking tape to create fishing poles and fish for four years to try to make as much money as possible. They have to consider the food web and make sure they are leaving fish so other fish can eat and reproduce by leaving two fish of the same species to mate. They have to plan and fish responsibly.
It's great to see them strategizing and talking through their plans. It's also awesome that they can see the results of their decisions immediately so they can make better plans for the next year.
You can also find great information about fisheries on pbs.org/. I use this in my ecology unit with life science. They have already learned about food webs, food chains and predator and prey before they get to this activity.