I understand your point, and I agree with you 100% that it is the right thing to do.
Where a problem arrises is that if you confess to a crime to a law enforcement officer, he has the duty to process you. The second problem is that possession of a live banned species is one crime and transporting that species is another. I worked in law enforcement when I was in the military. I kept a sense of humor, but I met numerous cops that did not. Trust me: you don't want to confess a crime to a police officer.
A zoo can get the transportation and possession permits, but they will not want the fish. If they want some talapia they can go to the ditch by their property and catch their own. They are an invasive species here and are everywhere; that is why they are banned.
I think the best solution is to "off them" and keep quiet about it.