I've often wondered what in general determines whether an SRC OR SALMON will strike a fly or take a fly by the head or by the tail? I'm pretty sure we can't outstrip a SRC or Salmon when it comes to speed. So, what triggers them to short strike or take out the head? I ask because sometime we go strictly trailer/stinger hook, and other times we fish "regular". I ask because I want to tie some flies "Tarpon style" but don't know if that will be a waste of time or if there's a way of knowing when fishing that way is more advantageous. A tying style like this http://www.flyshopofmiami.com/Fly images/Tarpon Flies/Ballyhoo Fly.jpg is is what I want to tie up for say sand lance. But it has me wondering if my hook up rate will drop significantly or not. Is it a water temp thing, a current speed thing? Is this even knowable why fish hit head first or tail first?