you are misrepresenting the data
Originally Posted by Maui Mike
(the above is a source from the wikipedia page on bottlenose dolphins)
also see, from dolphin project.org(a dolphin welfare site):
"Just a few examples of mortality statistics provided by members of the animal welfare community:
'Orcas can live up to 90 years in the wild. They live an average of only 5.2 years in captivity'In reality, there is not a huge difference with dolphin's lifespans in captivity. Although Orcas, yes do live shorter lives, though significantly longer than 7 years my friend; usually into their 20's.
'Bottlenose dolphins live up to 45 years in the wild. In captivity, they live an average of about 5 years.'
The most obvious problem with these statements, of course, is the fact that they compare maximum life expectancy of wild dolphins with the average lifespan of captive dolphins. Maximum life expectancy and average lifespan are two different values. They can’t be compared as if they were one, and for this reason alone the statistics are misleading."
This site does not list life expectancies as a reason to not house dolphin and other marine mammals. They do provide other very compelling reasons. Basically, it is likely that at some point the captive and wild avg. lifespan will be equivalent, and there will still be people against housing these animals. SO if you would like to not patronize Sea World and the like, that is fine, but make a more robust argument than what you have done here.
Personally, without my childhood experiences at Sea World I don't know that I would have the same appreciation for these creatures as I do. I have made the choice to accept certain trade-offs that go along with captive animals. I will leave it up to each person to make his or her own mind up about this.