That pollen will get them every time......
Glad they are being replaced, but it wasn't the pollen. Likely handling stress and stocking them shortly after applying the soilfloc.
Curious, what do you base your speculation that polymer use influenced, or played a role in the fish mortality? Is it based on your personal experience losing fish following the use of polymers to seal ponds? If so, please share your experience - this would serve as new science for the forum as I've never witnessed a fish kill event days after pond treatment in over 150 projects. I always remain open to new feedback on polymer use and their influence/effect on fisheries.