Lined Soapfish

Grammistes sexlineatus

The Lined Soapfish, also known as Grammistes sexlineatus, is a medium-sized marine fish that can reach up to 30 cm in length. Its dark brown body is marked by distinctive white to yellow horizontal lines, which vary in number depending on the fish's maturity. Juveniles start with spots that gradually develop into lines as they grow. Adults may have lines that break into dashes and spots. This species is found across the tropical and subtropical waters of the Indo-Pacific, from the eastern coast of Africa to the Pacific Ocean islands, including Hawaii and the Red Sea. Lined Soapfish inhabit coastal rocky and coral reefs, typically at depths ranging from 1 to 50 meters, though most are found shallower than 40 meters. They are solitary and often hide in crevices or under ledges during the day, becoming more active at night. The fish feeds on other fish and has toxin-producing glands in its skin, which secrete a bitter substance known as grammistins, giving rise to its common name. Encounters with the Lined Soapfish during dives are usually marked by their cryptic behavior, as they tend to stay hidden. Divers may spot them tucked away in reef crevices. The Lined Soapfish is not commonly targeted for food due to its bitter taste, and it holds a conservation status of Least Concern according to the IUCN.