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Gnathodentex aureolineatus, commonly known as the Striped large-eye bream, is a species of marine ray-finned fish belonging to the family Lethrinidae, the emperors or emperor breams. It is a moderately sized fish characterized by its distinctive golden-yellow stripes along its flanks and relatively large eyes. This species plays an important ecological role in coral reef ecosystems and is also a commercially important food fish in many parts of its range.
Physical Characteristics
- Body shape
- compressed
- Coloration
- The body is generally silvery-grey to brownish-grey dorsally, fading to silvery-white ventrally. The most striking feature is the presence of 4-6 prominent golden-yellow longitudinal stripes running along the flanks, often becoming more distinct posteriorly. A bright yellow blotch is typically present on the upper part of the caudal peduncle, just anterior to the caudal fin. The fins are often yellowish, particularly the caudal fin.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Large eyes relative to head size, 4-6 prominent golden-yellow longitudinal stripes on flanks, Bright yellow blotch on upper caudal peduncle, Small, conical teeth in the front of the jaws, with molariform teeth on the sides for crushing shells
- Dorsal fin
- Single dorsal fin with 10 spines and 10 soft rays. The spinous portion is continuous with the soft-rayed portion.
- Tail fin
- Moderately forked caudal fin, often yellowish.
- Pectoral fin
- Long and pointed pectoral fins, typically yellowish.
- Distinctive fins
- Anal fin with 3 spines and 8-10 soft rays. Pelvic fins with 1 spine and 5 soft rays.
Identification Tips
Golden-yellow stripes
Look for the characteristic 4-6 bright golden-yellow stripes running horizontally along the body. These are the most reliable visual identifier.
Yellow caudal peduncle blotch
A distinct yellow blotch on the upper part of the caudal peduncle (the narrow part of the body before the tail fin) is a key feature.
Large eyes
The eyes are noticeably large in proportion to the head, contributing to its 'large-eye bream' common name.
Fin coloration
The caudal fin and often the pectoral fins tend to have a yellowish hue, which can aid in identification.
Habitat
- Water type
- saltwater
- Depth
- Typically found at depths of 5 to 100 meters, occasionally deeper.
- Environment
- Inhabits coral reefs, rocky bottoms, and sandy areas adjacent to reefs. Often found in schools, particularly juveniles and sub-adults, while larger adults may be more solitary or in smaller groups. Prefers clear, coastal waters.
- Geographic range
- Indo-Pacific region, from East Africa and the Red Sea eastward to the Line Islands and Tuamotu Archipelago, north to southern Japan, and south to Australia (Queensland and Western Australia) and New Caledonia.
Aquarium Information
- Care level: advanced
- Temperament: semi-aggressive
- Diet: carnivore
- Minimum tank size: 250 gallons
- Temperature: 24-28°C (75-82°F)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Best kept in a large, species-specific tank or with other robust, semi-aggressive fish of similar size. Avoid keeping with very small or docile species. Can be territorial, especially towards conspecifics if not given ample space.
- Special requirements: Requires a well-established, mature aquarium with plenty of live rock for hiding and foraging. Excellent filtration and strong water movement are essential. A varied diet of high-quality meaty foods is crucial for health and coloration.
Wild Information
- Conservation status: least concern
- Seasonality: Available year-round, though local abundance may vary with spawning seasons and fishing pressure.
- Market price: Varies significantly by region and size, often considered a premium food fish.
- Commercial importance: medium
- Taste: Mild, sweet, and delicate
- Texture: Flaky, firm white flesh
- Cooking methods: Grilling, Baking, Steaming, Frying, Sashimi
- Nutritional value: Good source of lean protein, omega-3 fatty acids, and essential vitamins and minerals.
Key Facts
Nocturnal Foragerbehavior
While often seen in schools during the day, Striped large-eye bream are primarily nocturnal feeders, using their large eyes to hunt for benthic invertebrates and small fish under the cover of darkness.
Protogynous Hermaphroditeevolution
Like many Lethrinids, Gnathodentex aureolineatus is believed to be a protogynous hermaphrodite, meaning individuals mature first as females and later can change sex to male.
Reef Indicator Speciesinteresting
Their presence and abundance can be an indicator of healthy coral reef ecosystems, as they rely on these habitats for food and shelter.
Schooling Behaviorbehavior
Juveniles and sub-adults often form large schools, providing safety in numbers against predators. These schools can be a spectacular sight on coral reefs.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: No specific handling precautions beyond standard fish handling. Care should be taken with sharp fin spines, as with any fish, to avoid minor punctures. Not known to be venomous.
Similar Species
Yellowfin emperor
Lethrinus erythracanthus
While also having yellow fins, L. erythracanthus lacks the distinct golden longitudinal stripes and the yellow caudal peduncle blotch of Gnathodentex aureolineatus. Its body is typically more uniformly colored or mottled.
Spangled emperor
Lethrinus nebulosus
L. nebulosus has blue spots and lines on its head and body, and lacks the prominent golden stripes. Its body shape is also generally deeper and more robust.
Redgill emperor
Lethrinus miniatus
L. miniatus is more elongated, has a pointed snout, and lacks the golden stripes. Its coloration is typically reddish or brownish, often with faint bars.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Spariformes
- Family
- Lethrinidae
- Genus
- Gnathodentex
- Species
- Gnathodentex aureolineatus
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