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The Panamic Sergeant Major (Abudefduf concolor) is a species of damselfish found in the eastern Pacific Ocean. It is a relatively small, robust fish characterized by its dark coloration, especially when mature or breeding, and distinct vertical bars. Like other damselfishes, it is territorial and often found in rocky or coral reef environments.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Adults are typically dark brown to black, often appearing almost uniformly dark, especially during breeding. Juveniles and non-breeding adults may show faint vertical bars (usually 5-7) on a lighter brownish-gray body. The fins are generally dark, matching the body color. During breeding, males can become intensely dark, almost velvety black.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Deep, compressed body, Small mouth with conical teeth, Continuous dorsal fin, Forked caudal fin, Dark, often uniform coloration in adults, especially breeding males
- Dorsal fin
- Single, continuous dorsal fin with 13 spines and 12-13 soft rays.
- Tail fin
- Moderately forked caudal fin.
- Pectoral fin
- Well-developed, clear to dusky pectoral fins.
- Distinctive fins
- Anal fin with 2 spines and 12-13 soft rays.
Identification Tips
Coloration
Look for the overall dark brown to black body color in adults. Juveniles may have faint vertical bars, but these are less prominent than in other sergeant major species.
Body Shape
Its deep, compressed body is characteristic of damselfishes. It is more robust than some other Abudefduf species.
Fin Count
Counting dorsal fin spines (13) and soft rays (12-13) can help differentiate it from similar species, though this requires close observation.
Habitat
Its presence in the eastern Pacific, particularly in rocky reef environments, is a key indicator.
Habitat
- Water type
- saltwater
- Depth
- Typically found in shallow waters, from the surface down to about 10 meters (33 feet), occasionally deeper to 20 meters (66 feet).
- Environment
- Inhabits rocky reefs, tide pools, and areas with rubble or coral formations. Often found in surge zones and near shorelines. Juveniles may be found in shallower, more protected areas.
- Geographic range
- Eastern Pacific Ocean, from the Gulf of California south to Peru, including offshore islands such as the Revillagigedo Islands, Cocos Island, Malpelo Island, and the Galápagos Islands.
Aquarium Information
- Care level: intermediate
- Temperament: semi-aggressive
- Diet: omnivore
- Minimum tank size: 50 gallons
- Temperature: 72-78°F (22-26°C)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Can be kept with other robust, semi-aggressive fish. Avoid very small or docile tank mates. May become aggressive towards conspecifics or similar-looking fish.
- Special requirements: Requires plenty of rockwork for hiding and establishing territories. Good filtration and stable water parameters are essential. May nip at corals if not well-fed or if food sources are scarce.
Wild Information
- Conservation status: least concern
- Seasonality: Breeds year-round in tropical waters, with peak activity often tied to warmer months or specific lunar cycles. Generally present throughout its range year-round.
- Market price: Low
- Commercial importance: low
- Taste: Mild, somewhat bony
- Texture: Flaky
- Cooking methods: Frying, Grilling
- Nutritional value: Lean protein source, low in fat.
Key Facts
Territorial Naturebehavior
Panamic Sergeant Majors are highly territorial, especially during breeding. Males will aggressively defend their nests and eggs.
Parental Carebehavior
Males exhibit strong parental care, guarding and fanning the eggs until they hatch. The eggs are typically laid on hard substrates.
Dietary Habitsbehavior
Their omnivorous diet includes algae, small invertebrates, and zooplankton, making them important grazers and opportunistic feeders in their ecosystem.
Color Changebehavior
The dramatic darkening of their coloration, particularly in breeding males, serves as a visual signal for courtship and territorial defense.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: not recommended
- Handling notes: Generally harmless. Like all fish, handle with wet hands to protect their slime coat if caught. May nip if handled carelessly, but poses no significant threat.
Similar Species
Sergeant Major
Abudefduf saxatilis
A. saxatilis has a lighter, silvery-white body with 5 distinct black vertical bars that extend onto the dorsal and anal fins, and often a yellowish dorsal surface. A. concolor is generally much darker, especially as an adult, and its bars are less distinct or absent.
Indo-Pacific Sergeant
Abudefduf vaigiensis
Similar to A. saxatilis in having 5-7 prominent black vertical bars on a lighter body, but found in the Indo-Pacific. A. concolor is restricted to the Eastern Pacific and is typically much darker.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Pomacentridae
- Genus
- Abudefduf
- Species
- concolor
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