A man and his fish

Terrific sixth-plate occupational ambrotype of a man holding a large fish.   We are not sure of the species so if someone has an idea please contact us. While one might be tempted to say he caught this on his day off, judging from his outfit we suspect he might be a captain on the river who snagged this while working.  In either scenario it is quite unusual to see a fisherman with his catch.  The ruby ambrotype is in very good minus condition with some toning on the perimeter.  There is small spot just to the right of his eye.  There are a couple of very minor mat rubs but the larger area on the bottom is part of the tablecloth from a table that is partially seen when the mat is removed.  We have changed the cover glass.  The image is housed in a full case.