Got a photo? Identify fish instantly with the Fishby app.
Open the appDescription
Rhinopias agriloba is a highly cryptic and camouflaged species of scorpionfish, renowned for its elaborate dermal appendages that mimic surrounding algae and detritus. It is a master of disguise, often remaining motionless for extended periods, blending seamlessly into its environment to ambush prey. This species is highly sought after by underwater photographers and advanced aquarists due to its unique appearance and rarity.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Highly variable, ranging from mottled reds, purples, browns, and yellows to match the local substrate and algal growth. Often features irregular blotches and spots.
- Scale type
- none
- Mouth position
- superior
- Distinctive features
- Numerous, elaborate dermal flaps and cirri covering the head, body, and fins, resembling seaweed or detritus., Highly compressed body, giving it a leaf-like appearance., Large, upward-pointing eyes., Prominent, often elongated, supraorbital tentacles (eyebrow-like appendages).
- Dorsal fin
- Single, long dorsal fin with 12 spines and 8-9 soft rays. Spines are venomous.
- Tail fin
- Rounded caudal fin, often with dermal appendages.
- Pectoral fin
- Large, fan-like pectoral fins, often with elongated rays and dermal flaps, used for 'walking' on the substrate.
- Distinctive fins
- Pelvic fins are thoracic, with one spine and five soft rays. All fins are typically covered in dermal appendages.
Identification Tips
Dermal Appendages
The most striking feature is the extensive network of leaf-like dermal flaps and cirri covering its entire body, head, and fins. These are highly variable in shape and density.
Body Shape
Its highly compressed, almost flattened body, distinguishes it from other scorpionfish genera.
Coloration
Observe the highly variable and cryptic coloration, which perfectly matches its immediate surroundings. This can range from vibrant reds and purples to dull browns and greens.
Supraorbital Tentacles
Look for prominent, often elongated, tentacles above the eyes, which are also covered in dermal flaps.
Pectoral Fins
Note the large, fan-like pectoral fins, which are often used to 'walk' along the substrate rather than swim.
Habitat
- Water type
- saltwater
- Depth
- Typically found in depths ranging from 10 to 90 meters (33 to 295 feet), though occasionally shallower.
- Environment
- Prefers rocky reefs, rubble zones, and areas with abundant algal growth or soft corals, where its camouflage is most effective. Often found on sandy or silty bottoms adjacent to reefs.
- Geographic range
- Indo-Pacific region, including areas around Japan, Indonesia, Papua New Guinea, and potentially other scattered locations.
Aquarium Information
- Care level: expert
- Temperament: aggressive
- Diet: carnivore
- Minimum tank size: 75 gallons (280 liters)
- Temperature: 72-78°F (22-26°C)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Only compatible with other large, predatory fish that cannot be swallowed. Not suitable for reef tanks with small fish or invertebrates.
- Special requirements: Requires a well-established aquarium with plenty of live rock and substrate for camouflage. Excellent filtration and stable water parameters are crucial. Live feeder fish or shrimp are often necessary to initiate feeding, transitioning to frozen foods over time. Avoid strong currents.
Wild Information
- Conservation status: least concern
- Seasonality: No distinct seasonal patterns observed; present year-round in its habitat.
- Market price: High (for aquarium trade)
- Commercial importance: low
- Taste: Not typically consumed due to rarity and venomous spines.
- Texture: Not typically consumed due to rarity and venomous spines.
- Nutritional value: Not typically consumed due to rarity and venomous spines.
Key Facts
Master of Camouflageamazing
Rhinopias agriloba is one of the most highly camouflaged fish in the ocean, able to blend almost perfectly with its surroundings, making it incredibly difficult to spot.
Ambush Predatorbehavior
It is a classic ambush predator, remaining motionless and waiting for unsuspecting prey (small fish and crustaceans) to come within striking distance before rapidly engulfing them.
Walking Fishbehavior
Instead of swimming, Rhinopias agriloba often 'walks' along the seafloor using its modified pectoral and pelvic fins, enhancing its mimicry of drifting debris.
Color Changing Abilityinteresting
While not as rapid as chameleons, Weedy Scorpionfish can slowly change their coloration to match their specific environment, further aiding their camouflage.
Rare Sightinteresting
Due to its exceptional camouflage and often deep habitat, encountering a Rhinopias agriloba in the wild is considered a rare and special event for divers and researchers.
Safety Information
Venomous- Safety level: venomous
- Venomous: Yes
- Edibility: not recommended
- Handling notes: All scorpionfish possess venomous spines. Exercise extreme caution if handling. Punctures can cause intense pain, swelling, and other systemic symptoms. Seek immediate medical attention if stung. Never handle with bare hands.
Similar Species
Lacy Scorpionfish
Rhinopias aphanes
Rhinopias aphanes typically has more numerous, finer, and more 'lacy' dermal appendages, often with a more uniform pattern. R. agriloba tends to have broader, more paddle-like or leaf-like appendages, particularly on the fins and head. R. aphanes also often exhibits a more pronounced 'hump' on its back.
Eschmeyer's Scorpionfish
Rhinopias eschmeyeri
Rhinopias eschmeyeri generally has fewer and less elaborate dermal appendages, giving it a smoother appearance compared to the 'weedy' or 'lacy' species. Its body is also typically less compressed and more robust. The supraorbital tentacles are usually shorter and less branched.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Scorpaeniformes
- Family
- Scorpaenidae
- Genus
- Rhinopias
- Species
- agriloba
Explore Weedy Scorpionfish
Identify fish anywhere
Free on iOS, Android, and Web. Photo identification, full species details, and more.