Get a look at this item from The Scientist :
For decades, researchers and marine fisheries managers have considered the adipose fin—a small protuberance between the dorsal and tail fins—a vestigial organ, a relic of a bygone evolutionary era. But a study published today (March 5) in the Proceedings of the Royal Society B shows that bony versions of these structures have evolved independently and from more than one ancestor, suggesting that the adipose fin could play a subtle, yet vital, as-yet unidentified role in fish.
Then there’s “Elephant’s extra “toe”: Another “vestigial organ” bites the dust – in this case, literally
Your appendix: The king of vestigial organs has a job again
Is the term retained so people can attract attention to a new article by pointing out that such and so was thought to be vestigial but really isn’t? Or is the term itself a vestige of Darwinism? Perhaps it is itself the only example of the idea?
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Hatchery salmon have their adipose fin clipped off(under sedation), to distinguish them from wild salmon, who are protected. If the fin is not vestigial, maybe this isn’t such a good idea: