Prevalent in the clear waters that surround St. John, the Blue Tang Surgeonfish (Acanthurus coeruleus) begin as yellow juveniles, turn pastel blue as adolescents, and bright blue as adults. Called “Atlantic Blue Tangs” or “Caribbean Blue Tangs”, they can grow to be up to 15 inches long.
When snorkeling, you’ll most likely see the yellow juveniles swimming alone and the older blue tangs swimming . in schools, usually near other schools of their cousins, the sergeant majors.
Blue tangs eat algae and can be seen tickling the neck and fins of sea turtles looking for food. They are active swimmers during the day and will tuck-in for the night around rocks and coral. Read more about blue tangs here. Read about other reef fish here.
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