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The Red Steenbras (Petrus rupestris) is a large, predatory marine fish belonging to the family Sparidae (sea breams). It is highly prized by anglers and is an iconic species of the South African coastline. Known for its robust build and powerful jaws, it is a formidable predator in its rocky reef habitats. This species exhibits a distinct ontogenetic color change, with juveniles often displaying a more reddish hue that fades to a coppery-bronze or greyish-red in adults.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Juveniles are typically reddish-brown to copper-red, often with faint vertical bars. Adults are generally coppery-bronze to greyish-red dorsally, fading to a lighter belly. Fins are often darker, sometimes with reddish tints. Older, larger specimens can appear almost uniformly dark grey or brownish.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Large, robust body with a deep profile., Powerful jaws with strong, conical teeth, particularly prominent canines at the front of both jaws., Large, prominent eyes., Thick, fleshy lips., A single, continuous dorsal fin with strong spines., Large, ctenoid scales.
- Dorsal fin
- Single, continuous dorsal fin with 10-12 strong spines followed by 10-12 soft rays. The spiny portion is longer than the soft-rayed portion.
- Tail fin
- Moderately forked caudal fin.
- Pectoral fin
- Relatively long and pointed pectoral fins.
- Distinctive fins
- Anal fin with 3 strong spines and 7-8 soft rays. Pelvic fins are thoracic.
Identification Tips
Size and Shape
Look for a large, deep-bodied fish with a robust build. Adults can reach impressive sizes.
Coloration
Observe the coppery-bronze to reddish-grey coloration in adults, often with a lighter belly. Juveniles are distinctly redder.
Mouth and Teeth
Note the large mouth with thick lips and prominent, conical canine teeth at the front of the jaws, indicative of its predatory nature.
Dorsal Fin
Identify the single, continuous dorsal fin with strong, sharp spines in the anterior portion.
Habitat
- Water type
- saltwater
- Depth
- Typically found in depths ranging from 10 to 100 meters (33 to 330 feet), but can occur shallower or deeper.
- Environment
- Prefers rocky reefs, kelp beds, and areas with strong currents and abundant prey. Juveniles may inhabit shallower, more protected rocky areas.
- Geographic range
- Endemic to the coastal waters of Southern Africa, primarily from Namibia to KwaZulu-Natal, South Africa. Its distribution is largely restricted to the temperate and subtropical waters of the Benguela and Agulhas current systems.
Aquarium Information
- Care level: expert
- Temperament: aggressive
- Diet: carnivore
- Minimum tank size: Not suitable for home aquaria due to its large size and predatory nature. Requires public aquarium-scale exhibits.
- Temperature: 18-24°C (64-75°F)
- pH level: 8.1-8.4
- Hardness: 1.023-1.026 SG
- Compatibility: Not compatible with other fish species in captivity due to its predatory nature and large size. Best kept in species-specific exhibits or with very large, robust tank mates.
- Special requirements: Requires extremely large, well-filtered, and robust aquarium systems with ample rocky structures for shelter and territory. High protein diet of whole fish and crustaceans. Not typically kept in private aquaria.
Wild Information
- Conservation status: endangered
- Seasonality: Spawning typically occurs during late winter to early spring (July-September) in South Africa. Fishing regulations often include closed seasons and bag limits to protect spawning aggregations.
- Market price: High, particularly for recreational fishing charters and as a food fish in local markets.
- Commercial importance: high
- Taste: Excellent, firm white flesh with a rich, savory flavor.
- Texture: Firm, flaky, and moist.
- Cooking methods: Grilled, Baked, Fried, Steamed
- Nutritional value: Good source of lean protein, Omega-3 fatty acids, and various vitamins and minerals.
Key Facts
Top Predatorbehavior
The Red Steenbras is one of the apex predators in its rocky reef ecosystem, preying on a variety of fish and crustaceans.
Longevityinteresting
This species is known to be long-lived, with individuals potentially reaching ages of over 40 years, making them particularly vulnerable to overfishing.
Endemic to Southern Africainteresting
Petrus rupestris is found exclusively along the coast of Southern Africa, highlighting its unique regional importance.
Conservation Concernbehavior
Due to its slow growth, late maturity, and popularity with anglers, the Red Steenbras is classified as 'Endangered' by the IUCN.
Ontogenetic Color Changebehavior
Juvenile Red Steenbras are typically much redder than the coppery-bronze adults, a common phenomenon in many fish species.
Safety Information
Handle with care- Safety level: caution
- Venomous: No
- Edibility: edible
- Handling notes: Red Steenbras are powerful fish with strong jaws and sharp teeth. Anglers should exercise extreme caution when handling them to avoid bites. Use appropriate tools like lip grippers or gloves, and be mindful of their thrashing. The dorsal and anal fin spines are sharp and can inflict painful punctures, though they are not venomous.
Similar Species
White Steenbras
Lithognathus lithognathus
The White Steenbras has a more silvery-white coloration, a more elongated body, and lacks the prominent canine teeth of the Red Steenbras. It also typically inhabits sandy or estuarine environments rather than rocky reefs.
Poenskop
Cymatoceps nasutus
The Poenskop (Black Musselcracker) is generally darker, often blackish-grey, and has a distinctive humped forehead in larger individuals. Its teeth are more molar-like, adapted for crushing shellfish, whereas the Red Steenbras has prominent canines for grasping prey.
Seventy-four
Polysteganus undulosus
The Seventy-four is a deep-bodied, reddish-pink fish with distinctive wavy lines on its flanks. It has a smaller mouth and different dentition compared to the Red Steenbras. It is also critically endangered.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Spariformes
- Family
- Sparidae
- Genus
- Petrus
- Species
- rupestris
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