That is A sleeper but not a marbled sleeper, the only time I have seen a picture was in a very old Dr. Axelrods Atlas. They are bottom dwelling ambush predators that are mottled brown, green, and tan with a small rough fringe of skin. They are cylindrical and have a somewhat flattened head and a huge mouth. I like bowfins too, They are neat and if you accidently kill one they make a great meal.