attached to the substrate by a filament; the eggs turn greenish after a few days and are guarded by the male. As he guards the eggs the male becomes bluish in colour, guarding them for about a week. Etymology Sergeant majors earn their name from their brightly striped sides, known as bars, which are reminiscent of the insignia of a military sergeant major. References External links Video of Sergeant-Major - Video taken in Belize off Ambergris Caye. Sergeant major (fish) Fish of the Atlantic Ocean Fish described in 1758 Taxa named by Carl Linnaeus