b.hromada :
It doesn't take long, I take it?
They are easy to care for...but the life cycle takes several weeks. If you buy mealworms now, it could take 3 to 5 months to see them go through their life cycle and start to lay eggs. It depends on their environment (the colder they are the slower they grow). Keep in mind to give them ventilation and don't allow the carrot, apple, or potato to mold. Moisture in the tub is fine in moderation (mealworms and darkling beetles are experts at finding a source of moisture), but remember to allow air in, otherwise it gets musty and gross. Our worms are in a huge tub of wheat bran. We tried the oats, but they weren't eating them.
(Oats = waste of money. Wheat bran has been perfect...easy to sift through to get the medium to larger worms.)
Also, darkling beetles don't tend to fly, but that doesn't mean they can't. Keep a cover on them...our negligent kids had to wrangle a half dozen (flying) darkling beetles seeking new accomodations in the den!
I like the roach idea...however, in the cold northeast I don't think that would be an easy protein source for us to grow for our chickens. If they require 90 degrees and above to breed, that means heat lamp and electricity...$$$. Mealworms are easy, inexpensive (we got 5,000 for $30) and can be stored in a cool basement, den, bedroom...just about anywhere! Plus they are an excellent bluebird and robin treat.