How to Identify Fringed Flounder

To identify Fringed Flounder (Etropus crossotus), look at these key features.

Physical Characteristics

Body shape

flat

Coloration

Dorsal (eyed) side is typically light brown to grayish, often mottled with darker spots and blotches to blend with the substrate. The ventral (blind) side is white. The fins may have faint banding or spotting.

Scale type

ctenoid

Mouth position

superior

Distinctive features

Dextral (right-eyed) flatfish, meaning both eyes are on the right side of the head., Small, upturned mouth., Elongated rays on the dorsal and anal fins, giving a 'fringed' appearance., Lateral line is strongly arched over the pectoral fin.

Dorsal fin

Long, originating anterior to the eyes, with 70-85 rays. The anterior rays are often elongated, contributing to the 'fringed' look.

Tail fin

Rounded to slightly pointed, not forked.

Pectoral fin

Small, present on both sides, but often reduced on the blind side. The pectoral fin on the eyed side is typically longer than the head.

Distinctive fins

Anal fin is long, with 55-65 rays, also exhibiting elongated rays similar to the dorsal fin.

Identification Tips

1. 1

   Eye Position

   Always check that both eyes are on the right side of the head (dextral).

2. 2

   Mouth Size and Orientation

   The mouth is notably small and slightly upturned, distinguishing it from other flatfish with larger or more terminal mouths.

3. 3

   Fin Fringing

   Observe the elongated rays on the dorsal and anal fins, which give them a distinct 'fringed' or 'ragged' appearance.

4. 4

   Lateral Line

   Note the strong arch in the lateral line above the pectoral fin on the eyed side.

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