Blue tang

They are listed as the least concern by the IUCN.

An excerpt from the article 17 facts about blue tang
There are very common, even used as baitfish.

Scientists were concerned after the release of the animated movie “Finding Dory” (the sequel to the very popular “Finding Nemo”), that the demand for royal blue tangs would drastically increase, as was the case with clownfish after the 2003 movie “Finding Nemo.” Fortunately, that did not repeat.