BTW, you veggie-only types: thank yer lucky stars that humans don't have to consume live food to breed.
This is common among the few fish I have bred.
Very few species of fish require live food, in order to become conditioned to breed, typically just those that strictly eat live in captivity.
I've lost count how many animals I have killed, cleaned, butchered, and eaten. From thousands of fish, to elk and moose. Not for blood lust, I was putting food on the table when times were lean. Nowadays I just make a trip to the grocery store, and I have given up fishing for sport. I don't eat lobster, so that's a non issue for me.