I don't think there's any authoritative source on this question. It all depends on the individual's preference. You'll find some people who prefer to be called Hispanic, while other's insist on Latino. Ditto on African-American vs. Afro-American vs Black. As long as you're not using obvious racial slurs, I wouldn't sweat trying to keep up with the latest in PC. With all the nuts and nukes in the world, we could all end up being crispy critters so I'd settle for "human being." But it's definitely a no no to call a dolphin (the Flipper type) a fish, they get highly offended.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken