Shouldn't there be some brood in each hive this time of year? I had a strong hive which produced a full med. super last month. Yesterday I observed a huge congregation of bees outside the hive, so i had to go in and take a closer look. Lots of Honey and bees, especially in the upper body(2 deeps),
but no brood at all? I could not find the queen either. I checked two other hives and found a few frames of brood, so I think I must have lost the queen in the hive in question? Also, the bees outside the hive seemed agitated or excited, but there was no robbing behavior observed?