I appreciate your reply, Bob. I agree that there are practical problems of obtaining YOY fingerlings. If the OP had shown interest I would have encouraged him to talk with the Overton's who carry an aquaponics grade in the 1" to 3". Can't say for sure they would be what he would need but one might be able to obtain certifiable YOY from them.
This is a combination I have personal interest in doing at small scale. Thinking of ways I might address supply issues like this ... one solution I've considered is to stock females that are already brooding eggs. They produce eggs according to weight and so one could stock a specified weight that would limit the fry below an acceptable limit. One would need to work out a place for the spawning to take place. Not really practical for most but it is something I am interested in doing to resolve practical supply problems for YOY. As described, it's not really practical at tiny scales like the OP's where only one female would brood too many fry.
