This is a Lizard Fish (Florida Lizard Fish) common in brackish saltwater all through Florida! They are quite common to most experienced Florida fishermen! There are 2 types--the Banded Lizard Fish and the Spotted Lizard Fish. I suggest buying the book "The Fisherman's Guide to Florida Saltwater Fish "before" going fishing in Florida--it will enlighten you as to what you can keep (or what you can't), and may also keep you from getting seriously ill from eating or handling some species that are extremely poisonous!

I confess that I sort of cheated. When I can’t identify a fish I snap a picture, or in this case a screenshot. Then I bring it up in google photos and there’s a symbol at the bottom of the screen that looks like a square with rounded corners and a dot in the middle. When you click on that symbol google will search for pictures that resemble your picture. I find that most times the first picture that it shows is the correct one.
I find myself using it often since I moved down to Florida three years ago. I lived up north in Pennsylvania and I had never seen or heard of most of the fish I started catching down here. I find it to be a very handy tool for IDing fish and other wildlife and things in general. So it’s not just for IDing fish.