I want to say it a "golden" alligator gar.
I have only reliably heard of 3 gar species that are known to have this colour morph. Alligator, florida and longnose. Can rule out longnose right away. After that the larger fins seem to suggest the Atract. genus. And though I have heard of a golden cuban gar this specimen doesn't display the fuller body shape that cubans do, I will have to go with gator. Also the size would follow along with a gator gar that has not started to fill out yet.