Thanks guys.
DC, you are seeing some wood color for sure. Freshwater drum, or "Sheepshead" has some really interesting skin. When the scales are gone and the skin is dry, what's left is a translucent hide with some iridescent shininess that these pics really don't do justice to. This particular fish was big, close to 10 lbs and the skin was really quite thick. Comparable to deer hide. Here's the fish...