I agree, the sheer numbers involved would make it difficult. It's one thing to hand sort a few in a bag, but dumping mass quantities out of a tank directly into a pond/lake is another issue entirely.

The HSB I picked up a few weeks ago came with hitchhikers, but the hatchery mentioned that they probably would. Said they would be FHM.

And they were right. I examined each and every one, not because I didn't trust them, but because I can see how easy it would be to end up with something unintended.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.