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The Whitefin Swellshark (Cephaloscyllium albipinnum) is a species of catshark belonging to the family Scyliorhinidae. Like other swellsharks, it has the remarkable ability to inflate its body with water or air when threatened, making itself appear larger and more difficult for predators to swallow or dislodge from crevices. This species is characterized by its distinctive coloration and fin morphology, particularly the white margins on its fins, which give it its common name. It is a benthic species, typically found on continental shelves and upper slopes.
Physical Characteristics
- Body shape
- elongated
- Coloration
- The body is generally light brown to greyish-brown, often with indistinct darker saddles or blotches. The most distinguishing feature is the prominent white to pale margins on all fins, including the dorsal, pectoral, pelvic, and caudal fins. The underside is typically paler.
- Scale type
- placoid
- Mouth position
- inferior
- Distinctive features
- Ability to inflate its body with water or air when threatened., Prominent white margins on all fins., Relatively large, broad head., Small, widely spaced teeth.
- Dorsal fin
- Two dorsal fins, both relatively small and set far back on the body. The first dorsal fin originates over or slightly behind the pelvic fin origins. The second dorsal fin is similar in size to the first.
- Tail fin
- Caudal fin is relatively short and deep, with a distinct subterminal notch and a well-developed ventral lobe. The white margin is clearly visible.
- Pectoral fin
- Pectoral fins are moderately large and rounded, with distinct white margins.
- Distinctive fins
- All fins, including the pelvic fins, possess clear white to pale margins, a key diagnostic feature.
Identification Tips
Fin Margins
Look for the distinct white or pale margins on all fins (dorsal, pectoral, pelvic, and caudal). This is the most reliable distinguishing feature.
Body Inflation
If observed in a stressed state, its ability to inflate its body is characteristic of the genus Cephaloscyllium.
Coloration
Note the overall light brown to greyish-brown body color, which may have faint darker blotches or saddles.
Head Shape
Observe the relatively broad and somewhat flattened head.
Habitat
- Water type
- saltwater
- Depth
- Typically found on the continental shelf and upper slope, ranging from approximately 100 to 400 meters (330 to 1,300 feet).
- Environment
- Benthic, inhabiting soft bottoms (sand, mud) and rocky reefs. It is often associated with areas offering crevices or shelter.
- Geographic range
- Endemic to the waters off southeastern Australia, specifically from southern New South Wales to eastern Victoria, including Tasmania.
Aquarium Information
- Care level: expert
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: 750 gallons
- Temperature: 10-16°C (50-61°F)
- pH level: 7.9-8.4
- Hardness: 8-12 dKH
- Compatibility: Generally compatible with other large, peaceful, cold-water species. Avoid aggressive or fin-nipping fish. Requires a species-specific tank or very carefully selected tank mates due to its specialized needs.
- Special requirements: Requires a very large, cold-water aquarium with excellent filtration and oxygenation. A soft substrate is preferred as they are benthic. Hiding places such as caves or rock overhangs are essential. Due to its size and specialized care, it is not suitable for most home aquariums and is primarily found in public aquaria.
Wild Information
- Conservation status: least concern
- Seasonality: No specific seasonal patterns are well-documented for this deep-water species; likely present year-round within its range.
- Market price: N/A
- Commercial importance: none
- Taste: N/A
- Texture: N/A
- Nutritional value: N/A
Key Facts
Inflation Defensebehavior
The Whitefin Swellshark, like other swellsharks, can rapidly inflate its stomach with water (or air if brought to the surface) to deter predators or wedge itself into crevices, making it difficult to dislodge.
Endemic to Australiainteresting
This species is found exclusively in the temperate waters off southeastern Australia, highlighting its unique regional distribution.
Benthic Lifestylebehavior
It spends most of its life on the seafloor, foraging for small invertebrates and fish, and utilizing the substrate for camouflage and shelter.
Oviparous Reproductionbehavior
Like all catsharks, the Whitefin Swellshark is oviparous, laying distinctive egg cases (often called 'mermaid's purses') on the seabed.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: not recommended
- Handling notes: Whitefin Swellsharks are generally harmless to humans. However, like all sharks, they should be handled with respect and care if encountered. Their ability to inflate can make them difficult to handle, and their skin is abrasive. Avoid direct contact with their mouths. If caught incidentally, release quickly and carefully to minimize stress.
Similar Species
Draughtsboard Shark
Cephaloscyllium isabellum
C. isabellum typically has a more pronounced pattern of dark saddles and blotches resembling a draughtsboard, and lacks the prominent white fin margins characteristic of C. albipinnum. Its geographic range is also primarily New Zealand.
Australian Swellshark
Cephaloscyllium laticeps
C. laticeps generally has a more uniform brownish coloration, often with darker spots or blotches, but lacks the distinct white fin margins. Its head is also notably broad and flattened.
Reticulated Swellshark
Cephaloscyllium fasciatum
C. fasciatum has a distinctive reticulated or banded pattern over its body and lacks the white fin margins. Its range is also more northern in Australia.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Chondrichthyes
- Order
- Carcharhiniformes
- Family
- Scyliorhinidae
- Genus
- Cephaloscyllium
- Species
- albipinnum
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