I do not think this is anything with their normal life cycle. Two weeks ago I had minnows I could walk on, literally clouds of minnows on every pellet put out, to now, 2/3 of the pellets float to shore unmolested. My wife found a dead CC (about 3.5 Lbs) behind the pond today, either a GBH or racoon got it. Buzzards were finishing it up when she saw it.
Not sure if the rain was cold and shocked them, or something was in the runoff. My aerobic Septic system is up hill from the pond, some of that could have gotten in, but not much compared to total rain. I still see some of the CCs in the pond, and some of the new BC.
I am just hesitant to put more FHMs in until I know what is happening.
BB