Anyway I do not think there is a way to really determine the life the FISH COULD have had..
:bounce3:
I agree with this to at least some extent and wanted to expound upon it a little. Excluding irresponsible aquarists, and there are many, I actually think that many fish/inverts in our displays probably have a relatively safe and easy existence compared to life on your average reef. The carnage that goes on in the ocean is truly unbelievable.
While I absolutely agree that the hobby kills many, many animals in transit that would not have died so soon otherwise, the reality is that those fish that do make it probably have a higher percentage chance of survival (again, assuming they make it into a well cycled tank that is run by a responsible, knowledgable aquarist).
I can't and won't be held responsible for other people's negligence. I can only take care of myself and choose to live responsibly for the sake of my marine livestock. I only say this stuff because I don't think we should all have to hang our heads in shame because we keep fish and corals and stuff. We have a right to choose how we are going to live: responsibly and respectfully towards nature, or not. I choose to be responsible, and I also choose to see that while some livestock that have died in my tanks did so prematurely, many others lived long and safe lives that they might not have had if they were left on the reef. I don't know, just a different perspective.
In response to the OP's question. I've been in the hobby for 3 years and have had 5 separate tanks in that timespan. I don't count animals that were eaten by other animals in my tanks because that is natural predation and happens on the reef all the time.
Losses: Mantis shrimp x3 (2 unknown causes, 1 due to shell rot), Coral banded shrimp (ground up in powerhead), maybe 5-6 turbo/cerith snails (most likely starvation/lack of sufficient algae), 2 emerald crabs (lack of sufficient algae), 3-4 sps corals (combo of nudibranchs and inexperience on my part)