Good question! I was wondering that myself as I just hatched out some and was thinking that also. Does anyone know if they get really big and if you are supposed to feed them anything? thanks. I wonder the same thing for the moths of the horns and silks. Anyone know if their nutritional content stays the same?
soldier flies don't eat anything. When the maggots are ready to pupate, they empty their guts and get rid of their digestive system, including their mouthparts. The adults live a few days- just long enough to breed and lay several hundred eggs before they die.
I'm gearing up to grow my own this summer.
I can hardly wait!
I have no idea about the nutritional value of the adult flies.
For more info about the worms and how to culture them yourself: