U R going to find the naked person riding the porpoise all through visual art. I list just a few examples of interesting fish.
http://www.artfinding.com/Artwork/Vases/Etruscan-Black-Figure-Lekythos/4908.html
http://www.wga.hu/html/r/raphael/5roma/1/05farne.html
http://www.flickr.com/photos/ellipsis_design/194741287/
http://allart.biz/photos/image-616.html
I notice Raphael's porpoise has teeth.
