The Bluestripe Butterflyfish is endemic to Hawaii and is apparently one of the most common and of least concern (IUCN Red List). Perhaps this is the case elsewhere, especially in MPA of Papahanaumokuakea Marine National Monument, but this has not been my experience. A snorkeler is fortunate to see one of these fish on Maui, and I have only encountered one anywhere south of Kaanapali. They can be found on shallow, rocky reefs, and in coral gardens, feeding on polychaete worms and other benthic invertebrates. To 5 inches.
