Species Description…

Scientific Name: Abudefduf saxatilis

Common Name: Sergeant Major

Species Group: Damselfish

Habitat: Reef Safe with Caution

Care Level: Beginner

Temperament: Semi-aggressive

Diet Type: Omnivore

Role in Aquarium: Schooling Fish

Max Fish Length: 6 (inches)

Min Aquarium Size: 55 (gallons)

Native Range: Atlantic Ocean, including the Caribbean Sea, Gulf of Mexico, and Western Atlantic coast

Abudefduf saxatilis - The Sergeant Major

Abudefduf saxatilis (The Sergeant Major)

Native to the Atlantic Ocean, including the Caribbean, Gulf of Mexico, and western Atlantic reefs.
Recognized for its bold black vertical stripes over a silver-blue body, with a yellow hue near the dorsal fin.
A hardy and active species, commonly found in shallow reef environments and near docks or piers.
Often observed in large schools in the wild, making it a lively addition to aquariums.

Omnivorous diet, feeding on plankton, algae, and small invertebrates.
Readily accepts a wide variety of foods, including flakes, pellets, frozen shrimp, and algae-based diets.
Supplementing with live foods like brine shrimp and mysis shrimp enhances coloration and health.
Multiple small feedings per day help sustain their high energy levels.

Commonly found in reef areas, shipwrecks, and coastal rocky zones.
Prefers stable water conditions with moderate to strong currents.
Requires an aquarium with rock structures for shelter and territories.
Thrives in environments that mimic its natural surroundings with open swimming space.

Optimal water temperature: 72-80°F (22-27°C).
Ideal pH level: 8.0-8.4, with a specific gravity of 1.020-1.025.
Resilient and adaptable but requires good filtration and regular water changes.
Can be aggressive towards smaller or more passive fish, especially during feeding.
Providing plenty of space and hiding areas reduces aggression in community tanks.

Semi-aggressive; best suited for tanks with robust tank mates.
Compatible with similarly active fish such as tangs, wrasses, and larger clownfish.
May harass slow-moving or timid species, so careful selection of tank mates is necessary.
Does well in groups, but territorial disputes can arise if space is limited.

Highly active swimmer, often patrolling the mid-to-upper water column.
Can display dominance or territorial behavior, particularly around feeding times.
Often interacts with its environment, darting in and out of rock crevices.
Providing an enriched habitat with hiding spots and open areas encourages natural schooling behavior.