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The Pearl Perch (Glaucosoma scapulare) is a highly esteemed marine fish belonging to the family Glaucosomatidae. It is characterized by its distinctive pearly white spot on the shoulder, robust body, and excellent eating qualities. This species is a popular target for recreational and commercial fisheries along the eastern coast of Australia.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Silvery-grey to brownish-grey dorsally, fading to silvery-white ventrally. A prominent, iridescent pearly-white spot is located on the shoulder, just above the pectoral fin base. Fins are typically dusky or yellowish.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Prominent pearly-white spot on the shoulder (scapular region)., Large eyes relative to head size., Deep, compressed body., Large, ctenoid scales.
- Dorsal fin
- Single dorsal fin with 8 spines and 10-11 soft rays. The spinous portion is strong and continuous with the soft-rayed portion.
- Tail fin
- Caudal fin is emarginate (slightly forked) to truncate.
- Pectoral fin
- Pectoral fins are relatively long and pointed.
- Distinctive fins
- Pelvic fins are thoracic, located directly below the pectoral fins, with 1 spine and 5 soft rays. Anal fin has 3 spines and 9-10 soft rays.
Identification Tips
Pearly Spot
The most definitive feature is the iridescent, pearly-white spot located on the upper shoulder, just behind the gill cover and above the pectoral fin base. This spot is usually quite distinct and can be seen even on freshly caught specimens.
Body Shape and Coloration
Look for a deep, compressed body with a silvery-grey to brownish-grey back and silvery-white belly. The overall appearance is robust.
Fin Structure
Note the single, continuous dorsal fin with strong spines and the slightly forked to truncate caudal fin.
Large Eyes
Pearl Perch have relatively large eyes, which is common for fish inhabiting deeper reef environments.
Habitat
- Water type
- saltwater
- Depth
- Typically found in depths ranging from 10 to 100 meters, occasionally deeper.
- Environment
- Inhabits offshore rocky reefs, rubble grounds, and areas with sponges and gorgonians. Juveniles may be found in shallower, more sheltered reef areas.
- Geographic range
- Endemic to the eastern coast of Australia, from central Queensland south to central New South Wales. Its distribution extends from the Swains Reefs in Queensland down to approximately Port Stephens in New South Wales.
Aquarium Information
- Care level: expert
- Temperament: semi-aggressive
- Diet: carnivore
- Minimum tank size: 500 gallons
- Temperature: 22-26°C (72-79°F)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Generally not suitable for home aquaria due to size and specialized needs. If attempted, best kept in a species-specific tank or with very large, robust tank mates.
- Special requirements: Requires a very large, mature aquarium with excellent filtration and strong water movement. Live rock and ample hiding spaces are beneficial. Diet must consist of high-quality, varied marine proteins.
Wild Information
- Conservation status: least concern
- Seasonality: Available year-round, though fishing pressure and regulations may vary seasonally in different regions.
- Market price: High, due to excellent flesh quality and demand.
- Commercial importance: high
- Taste: Mild, sweet, and delicate flavor.
- Texture: Firm, white, flaky flesh with a high oil content.
- Cooking methods: baked, grilled, fried, steamed, sashimi
- Nutritional value: Rich in Omega-3 fatty acids, protein, and essential vitamins and minerals.
Key Facts
Prized Table Fishinteresting
Pearl Perch is highly regarded as one of Australia's finest eating fish, often fetching premium prices in seafood markets.
Deepwater Dwellerbehavior
While juveniles can be found shallower, adult Pearl Perch typically inhabit deeper offshore reefs, making them a target for specialized deep-sea anglers.
Unique Familyamazing
The family Glaucosomatidae, to which Pearl Perch belongs, contains only four species, all found in the Indo-Pacific region.
Growth Ratebehavior
Pearl Perch are relatively slow-growing and long-lived, reaching sexual maturity around 4-5 years of age.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: No specific venomous spines or toxic properties. Handle with care due to sharp dorsal fin spines and gill covers, as with any fish. Standard fish handling precautions apply.
Similar Species
Silver Perch
Bidyanus bidyanus
Silver Perch is a freshwater species, whereas Pearl Perch is marine. Silver Perch lacks the distinctive pearly spot and has a more elongated body shape.
Teraglin
Atractoscion aequidens
Teraglin (also known as Teraglin Jewfish) has a more elongated body, a distinct lateral line that curves upwards, and lacks the pearly shoulder spot. Its coloration is generally more golden or bronze.
Snapper
Pagrus auratus
Snapper typically have a more reddish or pinkish hue, especially when young, and often have blue spots. They lack the prominent pearly shoulder spot and have a different head profile.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Glaucosomatidae
- Genus
- Glaucosoma
- Species
- scapulare
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