Clearly anyone who visits this little sight has an interest in fishes, fishing, diving, etc. I think for some, interest becomes fascination which becomes amazement. Fishes are... amazing!
Here is a very nice little primer on the Diversity of Fishes. It's fairly long, and only scratches the surface of the topic, but well worth the time to watch. Skip forward to about 4:00....
The Grand Diversity of Fishes: Form, Function, and Evolution from HMNH on Vimeo.