Sorry to hear you have a problem. It is difficult to make out from the photos but obviously it is difficult to take photos of something so small?
Try looking here, there were a coupe of possibilities I noticed having a quick glance through it, vorticello, parasites
https://skfaquatics.com/forum/forums/topic/5052-shrimp-diseases-and-diagnosis/
Both the ones I saw say salt treatment so that may be worth a try anyway (not household salt but aquarium salt)!
Any idea where they came from, have you added anything new recently? I assume the yellow colour is eggs of the shrimp.
Hopefully you can set up a temporary quarantine tank whilst you try the salt treatment and others may give some further advice!
Simon