Name this fish!

[Tarpon4me]

OK, name this fish. It is commonly found along the majority of the continental US shoreline. The trick is, not only do you need to name the fish, but say why you know what species it is. I make it a point to note this because, it is commonly mistaken for another species of fish, but there is a single distinct aspect of it's anatomy that distinquishes it from it's poser.


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