That's good your fry have been sold. The reason this happens is pretty simple... Most people don't feed their fry ofen enough. I'm not pointing you out, I'm saying in general. Think about babies in general... They need to eat ALL the time. Feeding any less than 3 times a day causes them to find other food sources. If it wasn't the parents they were eating, then it was going to be the sibblings because they were going to eat regardless.