Speaking from experience, if you take your fresh shad, as soon as you get them, roll in cornmeal, put in a ziplok for vacuum bag and fresh then they are good for at least a year. The test is when you thaw a bag and cut them in two the blood should still be red. If so then you are good to go. This works. I agree with Bassin fresh is better but when its the middle of December and the shad are at 20 feet and you want to drift for blues and cant catch shad. Second best beats nuttin. I have used this method for years successfully.
This is good information....thanks