No blue bottle flies hatching out. Winter thing?

Ceycham

Established Member
Not sure if hatching was the right term, lol. But out of 250 BBF larvae, we've fed the worms for a while and once they turn black we generally just wait for the rest to become flies. Only it's not happening. Just wondering whatsupwidat? My soldier flies are still becoming flies. Sure missing this treat for my Norman!
 
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