The material in the back is a rod handle (Walnut, I believe)approx. 1" dia. The whole fish, snout to tail is approx. 2" long. Yes, I have done Tarpon, all the marlins (white, blue, sails etc.)and many other fish.
I have a friend down here that builds the custom rods to your specs. and I often hand-paint fish, boat-names etc. on them for him. I recommend his work (old school, quality stuff!)
Some additional samples: