This is the Walleye Stud Earring. It is the same casting used in the “Jumping Fish” Series of Pendants and makes a great set!
I grew up in the Midwest where the Walleye Run in the Spring is a big deal with the anglers. I recall the days of wading elbow to elbow trying my luck to catch these fish with a jig. I now catch them up in Northern Canada with a fly.