Who lives longer? A tough question. We know the average lifespan of our aquarium fish. Not to hard we watch them almost everyday of there life. But, what about there wild counterpart? Truth is we don't know for sure. (For most aquarium species that is) Its not like we can tag a fry and fallow it for a few years to see. If we did tag a few surly that would shorten there life. In my opinion I believe wild fish live longer, if of course there not eaten by predators. In the wild they have to fight to survive. In doing so they get stronger, therefore live longer. I would love to hear everyone's opinion on this.