You attempt to catch something in the lake. You cast your line out into the river. You use a lure from Earth that is very shiny.
It works like a charm. The fish put up quite a fight and when you land them, you’re surprised at how fat they are. Before too long, you’ve got 3 fish. The total weight is 12 pounds. You figure that you need 37 pounds to have enough food for two weeks. How many more pounds do you need to catch?