Obviously releasing the Orcas has not turned out very well, which is why I do in fact support banning the capture of new Orcas (they are not whales despite what their name may say), and chemically sterilizing the ones that are currently in captivity.
As for the comparison to fish, when alligator gars start forming long term close family groups, develop language, and develop the intelligence of a small child, come back to me. Until then, there is no comparison. And even keeping that analogy, I do support a ban, or a licensing requirement, for a good deal of fish. For instance, I don't think Petsmart should be allowed to sell Pacu to 8 year olds with a 10 gallon tank. Arapaima, have no business in this hobby at all.