Got a photo? Identify fish instantly with the Fishby app.
Open the appDescription
The Spotted Stargazer (Uranoscopus guttatus) is a benthic marine fish belonging to the family Uranoscopidae. It is characterized by its flattened body, upward-facing eyes, and a large, upward-pointing mouth, adaptations for its ambush predatory lifestyle. This species is known for burying itself in sand or soft sediment, leaving only its eyes and mouth exposed, waiting for unsuspecting prey. It possesses venomous spines and can deliver an electric shock, making it a species that requires careful handling.
Physical Characteristics
- Body shape
- flat
- Coloration
- Dorsal surface typically mottled brown, grey, or olive, often with irregular dark spots and blotches that aid in camouflage against sandy or muddy substrates. Ventral surface is paler, often whitish. The spots on the dorsal surface are a key identifying feature.
- Scale type
- none
- Mouth position
- superior
- Distinctive features
- Dorso-ventrally flattened body, especially the head., Large, upward-facing eyes positioned on top of the head., Large, wide mouth angled upwards., Presence of two venomous spines behind the operculum (gill cover)., Presence of electric organs behind the eyes, capable of delivering a shock., Fringed lips and sometimes a fleshy lure (worm-like appendage) inside the mouth to attract prey., Pectoral fins are large and fan-like, used for burrowing.
- Dorsal fin
- Two dorsal fins; the first is short with 3-5 spines, the second is longer with 13-15 soft rays. The first dorsal spine is often associated with a venom gland.
- Tail fin
- Truncate to slightly rounded caudal fin.
- Pectoral fin
- Large, broad, and fan-shaped, positioned low on the body, aiding in burrowing.
- Distinctive fins
- Pelvic fins are jugular (anterior to pectoral fins), with one spine and five soft rays.
Identification Tips
Body Shape and Eye Position
Look for a flattened body, especially the head, with both eyes positioned on the very top of the head, pointing upwards.
Mouth Orientation
Observe the large, wide mouth that is angled sharply upwards, a clear adaptation for ambush predation from below.
Coloration and Pattern
Note the mottled brown/grey/olive dorsal coloration with distinct irregular dark spots and blotches. This spotting pattern is key for U. guttatus.
Venomous Spines
Be aware of the two prominent, sharp, venomous spines located just behind the operculum (gill cover). These are a critical safety feature.
Electric Organs
While not visually obvious, the ability to deliver an electric shock is a characteristic of stargazers, and U. guttatus is one of the electric species.
Habitat
- Water type
- saltwater
- Depth
- Typically found in shallow coastal waters to depths of about 100 meters (330 feet), though occasionally deeper.
- Environment
- Benthic, inhabiting sandy, muddy, or silty bottoms in estuaries, bays, and open coastal areas. Prefers soft substrates where it can bury itself.
- Geographic range
- Indo-Pacific region, including the Red Sea, East Africa, and across to the Western Pacific, north to Japan, and south to Australia.
Aquarium Information
- Care level: expert
- Temperament: aggressive
- Diet: carnivore
- Minimum tank size: 150 gallons (568 liters)
- Temperature: 22-26°C (72-79°F)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Not suitable for most community tanks. Best kept in a species-specific tank or with very large, robust, and fast-moving fish that cannot be preyed upon or shocked. Avoid keeping with smaller fish or invertebrates.
- Special requirements: Requires a deep sand bed (at least 10-15 cm) for burying. Excellent filtration and stable water parameters are crucial. Provide ample open sand areas. Due to its venomous nature and electric capabilities, extreme caution is necessary during tank maintenance.
Wild Information
- Conservation status: least concern
- Seasonality: No specific seasonal patterns for commercial fishing or recreational targeting due to its benthic, ambush lifestyle and venomous nature. Activity may increase during warmer months in some regions.
- Market price: Low to none (as a food fish); moderate for specialized aquarists.
- Commercial importance: low
- Taste: Reported to have white, firm flesh, but not commonly consumed due to venomous spines and electric organs.
- Texture: Firm
- Cooking methods: Not typically prepared for consumption due to safety concerns.
- Nutritional value: Specific nutritional data is scarce due to its infrequent consumption. Likely similar to other lean white fish.
Key Facts
Ambush Predatorbehavior
The Spotted Stargazer is a master of camouflage, burying itself in the sand with only its eyes and mouth exposed, waiting to ambush unsuspecting prey.
Electric Shockamazing
Unlike many other venomous fish, U. guttatus can also deliver an electric shock, adding another layer of defense and predatory capability.
Oral Lurebehavior
Some individuals possess a worm-like appendage inside their mouth, which they wiggle to attract smaller fish, mimicking a potential meal.
Upward Gazeinteresting
Its common name 'Stargazer' comes from its unique eye placement on top of its head, allowing it to look upwards while buried.
Safety Information
Venomous- Safety level: venomous
- Venomous: Yes
- Edibility: not recommended
- Handling notes: Extreme caution is required when handling Spotted Stargazers. They possess two highly venomous spines located behind the operculum (gill cover) and can deliver a painful electric shock from organs located behind their eyes. Stings can cause intense pain, swelling, and localized tissue damage, and in severe cases, systemic effects. Always use thick gloves and avoid direct contact. If stung, seek immediate medical attention. Do not attempt to handle without proper training and protective gear.
Similar Species
Marbled Stargazer
Uranoscopus marmoratus
U. marmoratus typically has a more marbled or reticulated pattern rather than distinct spots. The overall body shape and eye position are similar, but the specific markings differ.
Smooth Stargazer
Uranoscopus scaber
U. scaber is found in the Atlantic and Mediterranean. It generally has a more uniform brownish coloration, often lacking the prominent spots of U. guttatus, and may have a different arrangement of spines or a smaller oral lure.
Giant Stargazer
Kathetostoma giganteum
While also a stargazer, Kathetostoma species generally have a more robust body and often lack the prominent venomous spines and electric organs found in Uranoscopus. Their coloration and specific head morphology can also differ.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Uranoscopidae
- Genus
- Uranoscopus
- Species
- Uranoscopus guttatus
Explore Spotted Stargazer
Identify fish anywhere
Free on iOS, Android, and Web. Photo identification, full species details, and more.