All you need for this craft is some cardstock paper, markers to decorate your paper, and a scissor.
Take your strip and decorate it. Then you will cut two marks with your scissor. You will cut them about an inch from the end, but do not cut all the way through to the other side, only cut about halfway. They will be on opposite sides too. See the picture below.
Then fold the paper and connect the slits you cut to make the fish. Throw it and see what it does!