Sami Salmenkivi runs a fish identification blog site. The site was started from the need to identify the creatures in underwater vacation pictures. Finding fish online is actually very difficult, unless you know the specific names of fish such as Freckled Hawkfish or Orangespined Unicornfish.
The purpose of the directory is to help find fishes based on shape, color or other identifications such as masks or stripes, as well as the fish families and regions. The Fish Directory is an open, free, and Creative Commons licensed.