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The Round Stingray (Urobatis halleri) is a small species of ray in the family Urotrygonidae, native to the coastal waters of the eastern Pacific Ocean. It is characterized by its nearly circular pectoral fin disc, short tail, and often mottled coloration. This species is well-known for its venomous caudal spine, which it uses defensively. It is a common inhabitant of shallow, sandy, or muddy bottoms in bays, estuaries, and nearshore coastal areas.
Physical Characteristics
- Body shape
- flat
- Coloration
- Dorsal surface typically light brown, gray, or olive, often with a pattern of darker spots, blotches, or reticulations that help it camouflage with the substrate. Ventral surface is white or cream-colored.
- Scale type
- none
- Mouth position
- inferior
- Distinctive features
- Nearly circular pectoral fin disc, slightly longer than wide., Short, stout tail, approximately 60-75% of disc length., One or more serrated, venomous spines located on the dorsal surface of the tail., Small dorsal fin located just anterior to the caudal spine., Small, rounded caudal fin at the tip of the tail.
- Dorsal fin
- A single, small, rounded dorsal fin is present just before the caudal spine.
- Tail fin
- Short, stout, and muscular, bearing one or more venomous spines. Terminates in a small, rounded caudal fin.
- Pectoral fin
- Forms a nearly circular disc, giving the ray its 'round' appearance.
- Distinctive fins
- The presence of a venomous caudal spine and a small, distinct caudal fin are key features.
Identification Tips
Disc Shape
Look for a nearly circular pectoral fin disc, which is a primary distinguishing feature.
Tail
Observe the short, thick tail with a small dorsal fin just before the venomous spine, and a distinct caudal fin at the tip.
Coloration
Note the mottled brown or gray coloration with darker spots or blotches, providing camouflage.
Size
Adults are relatively small, typically less than 30 cm (12 inches) in disc width.
Habitat
- Water type
- saltwater
- Depth
- Typically found in shallow waters from the intertidal zone down to about 30 meters (100 feet), occasionally deeper to 90 meters (300 feet).
- Environment
- Prefers sandy or muddy bottoms in bays, estuaries, lagoons, and nearshore coastal areas. Often found buried in the substrate, with only its eyes and spiracles exposed.
- Geographic range
- Eastern Pacific Ocean, from Humboldt Bay, California, USA, south to Panama. Most common from central California to Baja California, Mexico.
Aquarium Information
- Care level: expert
- Temperament: peaceful
- Diet: carnivore
- Minimum tank size: 500 gallons
- Temperature: 18-24°C (64-75°F)
- pH level: 8.1-8.4
- Hardness: 1.020-1.025 SG
- Compatibility: Requires a very large, specialized tank with a soft substrate. Compatible with other peaceful, bottom-dwelling species that are not small enough to be prey. Not suitable for most home aquariums due to size and specialized needs.
- Special requirements: Requires a large footprint tank with a deep, fine sand bed to allow for burrowing. Excellent filtration and stable water parameters are crucial. Avoid sharp decorations. Live foods or high-quality frozen meaty foods are essential. Due to its venomous spine, extreme caution is required during handling and tank maintenance.
Wild Information
- Conservation status: least concern
- Seasonality: Present year-round in its range, but may exhibit seasonal movements to warmer, shallower waters during colder months or for breeding.
- Market price: N/A
- Commercial importance: none
- Taste: Mild, slightly sweet
- Texture: Firm, flaky
- Cooking methods: Fried, Baked, Grilled
- Nutritional value: Lean protein source, low in fat.
Key Facts
Venomous Defensebehavior
The Round Stingray is well-known for its potent venomous spine, which is a defensive mechanism against predators and perceived threats, including humans.
Burrowing Behaviorbehavior
These rays frequently bury themselves in sand or mud, often leaving only their eyes and spiracles exposed, as a form of camouflage and ambush predation.
Live Bearersbehavior
Round Stingrays are ovoviviparous, meaning the embryos develop inside eggs within the mother's body, hatching internally, and then live young are born.
Dietary Habitsbehavior
Their diet primarily consists of small invertebrates found in the substrate, such as worms, crustaceans (shrimp, crabs), and small mollusks, which they detect using electroreception.
Common in Nearshore Watersinteresting
Despite their venomous nature, Round Stingrays are one of the most commonly encountered rays in shallow coastal waters of Southern California and Baja California.
Safety Information
Venomous- Safety level: venomous
- Venomous: Yes
- Edibility: edible
- Handling notes: The Round Stingray possesses one or more venomous spines on its tail. A sting can be extremely painful, causing intense localized pain, swelling, and sometimes nausea, vomiting, and muscle cramps. While rarely fatal, medical attention is often required. To avoid stings, shuffle feet when walking in shallow water ('stingray shuffle') to scare them away. If stung, immerse the affected area in hot water (as hot as can be tolerated without burning) to denature the venom, and seek medical attention to ensure the wound is clean and to remove any spine fragments.
Similar Species
Yellow Stingray
Urobatis jamaicensis
Found in the Western Atlantic. Typically has a more yellowish or greenish coloration with distinct dark spots or rings. The disc is often more oval than circular.
Cortez Round Stingray
Urobatis maculatus
Found in the Gulf of California. Often has more pronounced, larger dark spots or ocelli on a lighter background. Morphological differences are subtle and often require expert examination.
California Bat Ray
Myliobatis californica
Much larger species with a distinct, pointed snout and wing-like pectoral fins. Not a 'round' ray. Tail is much longer and whip-like.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Chondrichthyes
- Order
- Myliobatiformes
- Family
- Urotrygonidae
- Genus
- Urobatis
- Species
- Urobatis halleri
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