Here is a photo I have edited from google. I have live traced using eleven colours in Adobe Illustrator and then used the wand to delete appropriate areas around the fish in Adobe Photoshop. I will be able to use this is a Kurt Schwitters inspired collage.

http://www.google.co.uk/imgres?q=fish&hl=en&sa=X&biw=1920&bih=972&tbm=isch&prmd=imvns&tbnid=zlam86gCixJKtM:&imgrefurl=http://www.fishtankpet.com/&docid=YoPxw71LMbUevM&imgurl=http://www.fishtankpet.com/wp-content/uploads/2009/04/fishtankpet_beta_fish.jpg&w=375&h=300&ei=f8YnT-qqPKW10QXq5vCPBQ&zoom=1&iact=hc&vpx=634&vpy=178&dur=633&hovh=201&hovw=251&tx=172&ty=103&sig=108330980947533000352&page=1&tbnh=127&tbnw=153&start=0&ndsp=44&ved=1t:429,r:3,s:0

Here is a simple trace of the fish using the same techniques as before yet not editing anything of the threshold or anything else and using the original setting for it.