The yellow tang (Zebrasoma flavescens), also called Pacific tang, is a saltwater fish species of the family Acanthuridae. It is one of the most popular aquarium fish. Its local Hawaiian name is Lau'ipala.
They are small fish, and very thin.
They generally reach about 7.5 to 12.5 centimeters (3 to 5 inches) in length and height, and 1 to 2 centimeters (< 1 inch) in thickness, and are bright yellow in color across their entire bodies. During the night, in common with many fish, their color fades. A prominent brownish patch develops in the middle of both sides which then makes plane a horizontal white band. This probably helps camouflage the fish during periods of inactivity. They rapidly resume their all-over sulphur-yellow upon waking.
They have an arrow-like shape due to their dorsal and ventral fins being almost an extension to their bodies, and a long snout-like mouth used (as with other tangs) to eat the algae off rocks and coral. They are almost fully herbivores, and have become a popular fish in the marine fish hobby.
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