In the National hive I got the frame spacing way better than the WBC and so I can pull each frame out without pissing off the bees much at all.
This is also the hive we have a mites problem in.
We pulled out every single frame and visually inspected for mites and photographed every frame as it's a lot easier to spot when they're not all running around I guess. Anyway we could not find any mites while we were in there. Considering how hard they are to spot when they are dead on the varroa inspection board I wasn't suprised to not find them. But although we intended to sugar coat the bees to help control mites, we at least expected to spot at least one mite even if only very briefly.
Well we didn't see any and we decided to not sprinkle sugar on them as a response to that and we'd take another diagnosis from the frame photos.
Here's one of them.
Can't see any mites, but we got the queen again. There's no spoiler here, if you can't pick it out on this picture there's little hope for you. It's huge and has no really dark stripes. Most people mark there queens with a regulation approved colour, this is to make finding her easier (but lol ffs she's huge and not even difficult to spot I don't know why people say she is.) but also if you do mark her at birth anybody can tell her age from the mark as the colour changes every year on regulation. Ok, not as secure as the odometer on a car, but wtf, it's a queen, you don't like it just replace it.
So anyway I'm not gonna bother posting all the photos we took for diagnosing varroa as they are mostly frames of bees, but we studied them for about 5 minutes each and could not find a single mite on any picture.
So now we are baffled, we went back to our old pictures and they're not camera aberations or jpg artifacts, they're defintely varroa. And there was defintely varroa on the inspection board.
We can't really think of any reason for this disappearance of the mites. They breed on a 10 day cycle, and it's just possible that last week I'd had the hives for 10 days.
Remembering that the queens were trapped, it's possible that the frames I got had very little larva in them, and since the queens remained trapped for at least 4 days, the mites would have had to suffer the same procreation stress the bees were.
This could have created a sink in their numbers, because the mites breed by placing their eggs into the uncapped larvae, no uncapped larvae, no mites. It's a guess, I don't know.
Also we noticed the population of the National hive is really low. They life on just 2 of the 5 frames they came on. Low numbers of bees, low numbers of mites. That queen has got a real job on to repopulate that hive. Almost worried about it too.
Couldn't see any mites in the WBC hive either, but again didn't look much, they get more annoyed that the national hive bees. I've put the varroa inspection board back in the National hive, will count the mites next weekend.