Claus from PA came through with the first correct answer. It is a bowfin, amia calva. The last surviving species in its order. It’s also a hard fighting, under appreciated gamefish. No one got the extra credit answer. That is: gular plate, the bony plate under the chin.
To all that played: great guesses and good luck next time. To all that didn’t: check back often. There will be more chances to win.