Sometimes I wonder about the same issue, too. When they are imported in hundreds at size of 1-2", how could you 100% ID them?
In S.A. everyone calls Cichla "tucunare" or "pavon"..... I am 99% sure they don't know much about species types. Like you mentioned, few scenarios can happen:
1. Collect eggs directly from nest with parents witnessed and ID.
2.
Breeding facilities, ie: a lake, pond, or someone's garage in S.A.
3. Wild caught by net at 1-2" with egg sac still present

..... It's hard to believe they can survive in the process. Maybe 3-4", but not 1-2".