Lethrinus mahsena; Print; Lethrinus mahsena; common names the sky emperor; mahsena emperor; and cutthroat emperor; is a species of emperor fish. It grows to 65 cm in length; but is commonly found at 35 to 45 cm. This fish may be yellow to greenish-blue or olive-grey; becoming paler toward the belly. It is a non-migratory; reef-associated fish that has a high commercial value.; 1700-1880