What is "flagtail"

n. A group of perciform fish, the (taxlink Kuhlia genus noshow=1) genus, distinctive due to their scaly sheaths around the dorsal and anal fins.

The flagtails (āhole or āholehole in the Hawaiian language) are a family (Kuhliidae) of perciform fish of the Indo-Pacific area. The family consists of several species in one genus, Kuhlia. Most are euryhaline and often found in brackish water, but the genus also includes species restricted to marine or fresh water.

Several species are known as Hawaiian flagtails, particularly K. sandvicensis and K. xenura.