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The Pajama Catshark (Poroderma africanum) is a small, nocturnal bottom-dwelling shark belonging to the family Scyliorhinidae. It is characterized by its distinctive pattern of five to seven prominent, dark, longitudinal stripes running along its pale, yellowish-brown body, resembling pajamas. This species is endemic to the temperate coastal waters of South Africa and is a common inhabitant of rocky reefs and kelp forests. It is known for its docile nature and is a popular species in public aquariums.
Physical Characteristics
- Body shape
- elongated
- Coloration
- Pale yellowish-brown to greyish-white body with five to seven prominent, dark, longitudinal stripes running from the head to the caudal fin. The underside is typically plain white.
- Scale type
- placoid
- Mouth position
- inferior
- Distinctive features
- Five to seven prominent dark longitudinal stripes on a pale body., Small, cat-like eyes with nictitating membranes., Nasal barbels present, extending to the mouth., Two dorsal fins, both located far back on the body.
- Dorsal fin
- Two small, spineless dorsal fins. The first dorsal fin originates behind the pelvic fin origin, and the second dorsal fin is slightly smaller and originates behind the anal fin origin.
- Tail fin
- Long, low caudal fin with a distinct subterminal notch and a poorly developed lower lobe.
- Pectoral fin
- Moderately large and rounded.
- Distinctive fins
- Pelvic fins are relatively large and broadly rounded. Anal fin is present and originates below the second dorsal fin.
Identification Tips
Stripe Pattern
The most definitive feature is the five to seven dark, longitudinal stripes on a pale background, resembling pajamas.
Nasal Barbels
Presence of prominent nasal barbels that reach the mouth.
Dorsal Fin Position
Both dorsal fins are located far back on the body, with the first dorsal fin originating behind the pelvic fins.
Size
Typically reaches a maximum length of about 1 meter (3.3 feet).
Habitat
- Water type
- saltwater
- Depth
- Typically found in shallow coastal waters from the intertidal zone down to about 100 meters (330 feet), though most common in less than 20 meters (66 feet).
- Environment
- Prefers rocky reefs, kelp forests, and sandy bottoms adjacent to reefs. Often found resting in crevices or under ledges during the day.
- Geographic range
- Endemic to the temperate coastal waters of South Africa, from the Western Cape to KwaZulu-Natal.
Aquarium Information
- Care level: advanced
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: 750 gallons (2839 liters) for a single adult, larger for multiple individuals
- Temperature: 16-22°C (61-72°F)
- pH level: 8.1-8.4
- Hardness: 10-12 dKH
- Compatibility: Generally compatible with other large, peaceful, cold-water fish that are not small enough to be considered prey. Avoid aggressive species or those that might nip at its fins. Not suitable for reef tanks due to potential predation on invertebrates.
- Special requirements: Requires a large, well-filtered aquarium with excellent water quality. Provide ample hiding places such as caves and rock overhangs. A sand or fine gravel substrate is preferred as they often rest on the bottom. Requires a mature tank and a consistent feeding schedule. Sensitive to high nitrate levels.
Wild Information
- Conservation status: near threatened
- Seasonality: No distinct seasonal migration patterns are observed; they are present year-round in their habitat.
- Market price: Not typically targeted for commercial fisheries; occasionally caught as bycatch.
- Commercial importance: low
- Taste: Not commonly consumed; taste is generally described as mild.
- Texture: Firm, white flesh.
- Cooking methods: Fried, Grilled, Baked
- Nutritional value: Similar to other shark species, it would be a source of protein and omega-3 fatty acids, though not a primary food fish.
Key Facts
Nocturnal Hunterbehavior
Pajama Catsharks are primarily nocturnal, spending their days resting in sheltered areas and emerging at night to hunt for food.
Egg-laying Sharkinteresting
Like other catsharks, Poroderma africanum is oviparous, laying distinctive 'mermaid's purse' egg cases that are anchored to kelp or other structures.
Electrosensory Prowessamazing
They possess ampullae of Lorenzini, specialized electroreceptors that allow them to detect the weak electrical fields produced by prey, even when hidden in sand or crevices.
Camouflage Masterbehavior
The striped pattern provides excellent camouflage among the kelp and rocky crevices of its habitat, helping it ambush prey and avoid predators.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: not recommended
- Handling notes: Pajama Catsharks are generally docile and not considered dangerous to humans. They may bite if provoked or handled carelessly, but their small teeth are unlikely to cause serious injury. Handle with care and respect, avoiding direct contact with the mouth. They are best observed in their natural habitat or in controlled aquarium environments.
Similar Species
Leopard Catshark
Poroderma pantherinum
The Leopard Catshark has a pattern of dark spots and blotches, rather than distinct longitudinal stripes. Its body is generally more slender.
Speckled Catshark
Poroderma rousseauxi
The Speckled Catshark has numerous small, dark spots scattered over its body, lacking the prominent stripes of the Pajama Catshark.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Chondrichthyes
- Order
- Carcharhiniformes
- Family
- Scyliorhinidae
- Genus
- Poroderma
- Species
- africanum
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