L. trewavasae looks a lot like L. fuelleborni, but has a leaner body; therefore it can fit into small holes between rocks. The shape of the mouth is supposed to allow them to scratch algae from the rocks at an angle to minimize drag from streaming water. Colors can vary from place to place. Some males are completely blue, others have a partly orange body. Another combination is a blue body with a bright orange dorsal fin. Females and juveniles are usually orange.
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