How to Identify Peacock Flounder

To identify Peacock Flounder (Bothus mancus), look at these key features.

Physical Characteristics

Body shape

flat

Coloration

Highly variable, ranging from light tan to dark brown, often mottled with intricate patterns of spots, rings, and blotches that mimic sand, gravel, or coral. Typically has three prominent dark spots forming a triangle on the lateral line, though these can be subdued depending on camouflage.

Scale type

ctenoid

Mouth position

superior

Distinctive features

Both eyes on the left side of the head in adults., Exceptional camouflage abilities, rapidly changing color and pattern., Three distinct dark spots on the lateral line (often visible)., Anterior dorsal fin rays are elongated and branched in males, forming a prominent 'peacock' display.

Dorsal fin

Long, continuous fin extending from the head to the caudal peduncle, with 87-99 rays. Anterior rays in males are often elongated and branched.

Tail fin

Rounded to slightly pointed caudal fin.

Pectoral fin

Well-developed, fan-like pectoral fins, with the left pectoral fin typically longer than the right.

Distinctive fins

Anal fin is also long and continuous, with 67-76 rays. Pelvic fins are small and located anteriorly.

Identification Tips

1. 1

   Eye Placement

   Both eyes are on the left side of the head. This is a key characteristic of the family Bothidae.

2. 2

   Coloration and Pattern

   Look for its remarkable ability to blend in with the substrate. While variable, the presence of three dark, often ocellated (eye-like) spots forming a triangle on the lateral line is a strong indicator.

3. 3

   Male Dorsal Fin

   In mature males, the anterior dorsal fin rays are noticeably elongated and branched, resembling a small plume or 'peacock' display, which is a distinguishing feature.

4. 4

   Body Shape

   Its highly flattened, oval to rhomboid body shape is typical of flounders, but its specific pattern and eye placement help differentiate it.

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