Pikeminnow Infestation On The American?

[Troutsource]

Fished Sunday 11-3 mind-river for steelies, caught one beefy wild 18-incher. Saw some gear fishermen catch some shad from the bank.

But the main "attraction" was a pod of 100-200 pikeminnows that willingly took nymphs. See attached below. I've never seen such a pod, nor have I ever caught pikeminnows of this size before. I believe they were spawning as some looked stuffed with eggs and others squirted ...ahem... when I handled them. The mykiss was right among/behind them (maybe waiting for eggs?).

Is such a pod of pikeminnows normal this time of year (first time I've fished this time of year possibly ever)? Or is it a bad omen?