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The Ocellated Flounder (Ancylopsetta quadrocellata) is a small, dextral (right-eyed) flatfish belonging to the family Paralichthyidae. It is characterized by its distinctive coloration and prominent ocelli (eye-like spots) on its eyed side. This species is well-adapted for camouflage on sandy and muddy bottoms, where it ambushes prey.
Physical Characteristics
- Body shape
- flat
- Coloration
- The eyed side is typically light brown to grayish, mottled with darker spots and blotches, providing excellent camouflage. The most distinctive feature is the presence of four prominent, dark-ringed ocelli (eye-spots) arranged in a square pattern on the eyed side. The blind side is white.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Four prominent ocelli (eye-spots) on the eyed side, arranged in a square pattern., Dextral (right-eyed) orientation, meaning both eyes are on the right side of the head., Small mouth with sharp, conical teeth., Lateral line with a distinct arch over the pectoral fin.
- Dorsal fin
- Originates anterior to the upper eye, with 65-75 rays. Extends almost the entire length of the body.
- Tail fin
- Rounded to slightly truncate caudal fin.
- Pectoral fin
- Well-developed, with 10-12 rays on the eyed side, smaller or absent on the blind side.
- Distinctive fins
- Anal fin with 50-60 rays, mirroring the dorsal fin in shape and length.
Identification Tips
Ocelli
Look for the four distinct, dark-ringed eye-spots arranged in a square pattern on the upper (eyed) side of the body. This is the most reliable distinguishing feature.
Eye Placement
Confirm that both eyes are on the right side of the head (dextral flatfish).
Body Shape
Observe the relatively oval to rounded body shape, typical of many flounders.
Lateral Line
Note the distinct arch in the lateral line above the pectoral fin.
Habitat
- Water type
- saltwater
- Depth
- Typically found in shallow coastal waters, from depths of 1 to 100 meters (3 to 330 feet), but most commonly in less than 50 meters.
- Environment
- Prefers sandy or muddy bottoms, often near seagrass beds or shell hash, where it can bury itself for camouflage and ambush prey. Estuarine environments are also common habitats for juveniles.
- Geographic range
- Western Atlantic Ocean, from North Carolina south along the U.S. coast, throughout the Gulf of Mexico, and along the coast of Central and South America down to Brazil.
Aquarium Information
- Care level: advanced
- Temperament: semi-aggressive
- Diet: carnivore
- Minimum tank size: 120 gallons
- Temperature: 68-75°F (20-24°C)
- pH level: 8.1-8.4
- Hardness: 8-12 dKH
- Compatibility: Best kept in a species-specific tank or with other large, non-aggressive bottom dwellers. Avoid small fish or invertebrates as they may be prey.
- Special requirements: Requires a deep sand bed for burrowing, ample open swimming space, and excellent water quality. Sensitive to nitrates.
Wild Information
- Conservation status: least concern
- Seasonality: Can be found year-round, with peak abundance often in warmer months.
- Market price: Low
- Commercial importance: low
- Taste: Mild, delicate
- Texture: Flaky, white meat
- Cooking methods: Pan-fried, Baked, Steamed, Broiled
- Nutritional value: Good source of lean protein and omega-3 fatty acids.
Key Facts
Master of Camouflagebehavior
The Ocellated Flounder can rapidly change its coloration and pattern to match its substrate, making it incredibly difficult to spot on the seafloor.
Ambush Predatorbehavior
This flounder is a classic ambush predator, burying itself in sand or mud with only its eyes protruding, waiting for unsuspecting prey to swim by.
Right-Eyed Flounderinteresting
Ancylopsetta quadrocellata is a dextral flatfish, meaning both of its eyes are located on the right side of its head as an adult. This is a key characteristic for identification within the flatfish order.
Ocelli Functionbehavior
The prominent ocelli (eye-spots) are believed to serve as a form of mimicry, potentially deterring predators by making the flounder appear larger or more intimidating, or simply confusing them.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: No specific handling precautions are required beyond standard fish handling practices to avoid fin spines. They are not venomous or dangerous.
Similar Species
Fringed Flounder
Etropus crossotus
Lacks the prominent ocelli of the Ocellated Flounder. Generally smaller and has a more elongated body shape. The lateral line is less arched.
Bay Flounder
Paralichthys albigutta
Typically larger and has three distinct ocelli, often arranged in a triangle, rather than four in a square. The Bay Flounder also has a more diamond-shaped body.
Summer Flounder (Fluke)
Paralichthys dentatus
Significantly larger, with a more elongated body and numerous small, dark spots, but lacks the distinct, large ocelli of A. quadrocellata. It is also a left-eyed (sinistral) flounder, unlike the right-eyed Ocellated Flounder.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Pleuronectiformes
- Family
- Paralichthyidae
- Genus
- Ancylopsetta
- Species
- quadrocellata
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