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The Brown Stingaree (Trygonoptera mucosa) is a species of cartilaginous fish in the family Urolophidae, commonly known as round rays or stingarees. It is endemic to the temperate waters of southern Australia. This species is characterized by its rounded, disc-like body, short tail, and generally uniform brown coloration. Like other stingarees, it possesses a venomous spine on its tail for defense.
Physical Characteristics
- Body shape
- flat
- Coloration
- Dorsal surface is typically uniform brown, reddish-brown, or yellowish-brown, sometimes with faint darker spots or mottling. Ventral surface is white or pale, often with darker margins on the disc and tail.
- Scale type
- none
- Mouth position
- inferior
- Distinctive features
- Rounded, almost circular disc, slightly wider than long., Short, stout tail, less than half the disc length, with a prominent, serrated venomous spine., No dorsal fins., Small caudal fin present at the tip of the tail., Snout is short and broadly rounded., Eyes are relatively small and followed by larger spiracles.
- Dorsal fin
- Absent
- Tail fin
- Short, stout, with a small, leaf-like caudal fin at the tip. Bears a single, prominent venomous spine.
- Pectoral fin
- Fused with the head and body to form the disc.
- Distinctive fins
- Pelvic fins are small and rounded, located beneath the posterior part of the disc.
Identification Tips
Disc Shape
Look for a distinctly rounded, almost circular disc that is slightly wider than it is long.
Tail Length
Note the very short, stout tail, which is considerably less than half the length of the disc.
Coloration
Observe the uniform brown to reddish-brown dorsal coloration, often without prominent markings, distinguishing it from more patterned stingarees.
Dorsal Fins
The complete absence of dorsal fins on the tail is a key characteristic of the family Urolophidae.
Venomous Spine
Presence of a single, prominent serrated spine on the dorsal surface of the tail, usually located about halfway along its length.
Habitat
- Water type
- saltwater
- Depth
- Typically found in shallow coastal waters, from the intertidal zone down to about 100 meters (330 feet), though occasionally recorded deeper to 200 meters (660 feet).
- Environment
- Benthic, inhabiting sandy or muddy bottoms, seagrass beds, and rocky reefs. Often buries itself in the substrate.
- Geographic range
- Endemic to southern Australia, ranging from Jurien Bay in Western Australia to Jervis Bay in New South Wales, including Tasmania.
Aquarium Information
- Care level: expert
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: Not suitable for home aquaria due to size, specialized needs, and venomous nature. Public aquariums may house them in very large, specialized exhibits.
- Temperature: 12-20°C (54-68°F)
- pH level: 7.8-8.4
- Hardness: High (marine)
- Compatibility: Not compatible with most aquarium species due to specialized needs and potential for accidental stinging. Best kept in species-specific exhibits if at all.
- Special requirements: Requires very large, specialized cold-water marine systems with soft substrate, excellent filtration, and careful handling protocols due to its venomous spine. Not recommended for private aquarists.
Wild Information
- Conservation status: least concern
- Seasonality: No specific seasonal migrations or breeding patterns are well-documented for this species, though reproduction is viviparous with a gestation period likely around 10-12 months.
- Market price: Not typically marketed for consumption.
- Commercial importance: low
- Taste: Not commonly consumed; taste is generally described as mild, similar to other rays.
- Texture: Firm, flaky white flesh.
- Cooking methods: Not applicable for this species due to low commercial importance and conservation status.
- Nutritional value: No specific nutritional data available due to lack of commercial exploitation.
Key Facts
Benthic Lifestylebehavior
Brown Stingarees are primarily bottom-dwellers, often burying themselves in sand or mud to ambush prey or hide from predators.
Viviparous Reproductionbehavior
Like all stingarees, Trygonoptera mucosa is viviparous, meaning the embryos develop inside the mother and are nourished by a 'uterine milk' secreted by the uterine wall, rather than a yolk sac alone.
Venomous Defensebehavior
The prominent serrated spine on its tail is a defensive mechanism, capable of delivering a painful venomous sting if the ray feels threatened.
Endemic to Australiainteresting
This species is found exclusively in the temperate coastal waters of southern Australia, making it a unique part of the region's marine biodiversity.
Safety Information
Venomous- Safety level: venomous
- Venomous: Yes
- Edibility: not recommended
- Handling notes: The Brown Stingaree possesses a venomous spine on its tail. When disturbed or stepped on, it can inflict a painful wound. Handle with extreme caution, if at all. If stung, seek immediate medical attention. The wound should be immersed in hot water (as hot as can be tolerated without scalding) to denature the venom, and any spine fragments should be removed. Antivenom is not typically available, and treatment focuses on pain management and preventing secondary infection.
Similar Species
Banded Stingaree
Trygonoptera melanospila
Distinguished by its distinctive dark bands or blotches on a lighter background, contrasting with the uniform coloration of T. mucosa.
Western Stingaree
Trygonoptera personata
Generally has a more elongated snout and often a more mottled or patterned dorsal surface, though coloration can be variable. Geographic range also differs slightly.
Eastern Shovelnose Stingaree
Trygonoptera imitata
Possesses a more pointed, shovel-like snout and typically has a more yellowish-brown coloration with darker spots or reticulations.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Chondrichthyes
- Order
- Myliobatiformes
- Family
- Urolophidae
- Genus
- Trygonoptera
- Species
- mucosa
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