Definition
A sergeant major is a type of damselfish, known for its bold, striped pattern resembling military ranks. These fish are common in tropical and subtropical waters, often seen around coral reefs and rocky shores. They're relatively small but have a big personality, fiercely defending their territory. Think of them as the 'drill sergeants' of the reef, always on patrol. They eat algae and small invertebrates, keeping the reef clean. Their distinct appearance makes them easy to spot underwater.