Fish Identification

I am enthralled with fish and the creatures that can be encountered underwater. Many things I've seen while diving are beautiful and mysterious. Yet, I want to know more about them. For instance, the first fish I saw on dive #2 was actually a pair of spotfin butterflyfish (see the video below). And on dive #4 I saw an amazing creature which I later learned is called a jackknife fish (shown in the photo on the top right). However, the jackknife fish I saw was a juvenile and was predominately yellow with a brownish- black stripe. Thanks to my friend and colleague, Brian Bogie of Schwartz Communication, I now own a 500 page Reef Fish Identification book.