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Smallmouth flounder (Etropus microstomus) — Paralichthyidae

Smallmouth flounder

Etropus microstomus
LC · Least Concern

The Smallmouth flounder (Etropus microstomus) is a saltwater fish of the family Paralichthyidae that grows up to 13 cm.

Length
13 cm
Water
Saltwater
Depth
0–91.0 m
Diet
Carnivore
Behaviour
Solitary
Body shape
Irregular
Substrate
Sand / mud bottom
Danger
Harmless
Range
Northwest Atlantic, on sandy bottoms of shallow coastal waters and estuaries.
Edibility
Not eaten

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Description

The smallmouth flounder is a small left-eyed flatfish (family Paralichthyidae) of the north-western Atlantic. The species reaches about 13 cm and has an oval, flattened, brown mottled body with both eyes on the left side and a conspicuously small mouth. It lives on sandy bottoms of shallow coastal waters and estuaries. Its diet consists of small crustaceans and bottom invertebrates. Because of its small size the species is of no fishery value and is harmless to humans; it often lies camouflaged buried in the sand.

Frequently asked questions

How do you recognise the Smallmouth flounder?

The Smallmouth flounder has an irregular in shape body, is mainly brown and shows a marbled pattern. Small left-eyed flounder with a strikingly small mouth.

Where does the Smallmouth flounder live?

The Smallmouth flounder lives in the sea (marine waters) and is mostly found around sand or mud bottom. Northwest Atlantic, on sandy bottoms of shallow coastal waters and estuaries.

How big does the Smallmouth flounder get?

The Smallmouth flounder grows to a maximum of about 13 cm.

Is the Smallmouth flounder dangerous to humans?

No, the Smallmouth flounder is harmless to humans. None required: this species is harmless to humans.

Is the Smallmouth flounder edible?

The Smallmouth flounder is not usually eaten.

More photos

Smallmouth flounder (Etropus microstomus) — Paralichthyidae — 2
maxfish (CC BY-NC 4.0) via GBIF — iNaturalist
Smallmouth flounder (Etropus microstomus) — Paralichthyidae — 3
iNaturalist ((c) follin4ollie, some rights reserved (CC BY-NC))
Smallmouth flounder (Etropus microstomus) — Paralichthyidae — 4
Wikimedia Commons — Smithsonian Environmental Research Center (CC BY 2.0)
Smallmouth flounder (Etropus microstomus) — Paralichthyidae — 5
iNaturalist ((c) Joe Kunkel, some rights reserved (CC BY-NC))
Fin

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All data

Identification

English name
Smallmouth flounder verified
Scientific name
Etropus microstomus
Family
Paralichthyidae
Other names
Smallmouth flounder verified

Appearance

Size class
Small verified
Max length (cm)
13.0 verified
Body shape
Irregular sourced
Dominant colour
Brown inferred
Pattern
Marbled inferred
Tail shape
Rounded inferred
Mouth position
Terminal inferred
Lips
Thin inferred
Barbels
No sourced
Dorsal fins
One continuous inferred
Dorsal spines
No sourced

Habitat & distribution

Water type
Saltwater sourced
Substrate
Sand / mud bottom sourced
Max depth (m)
91.0 verified
Natural range
Northwest Atlantic, on sandy bottoms of shallow coastal waters and estuaries. inferred
Origin
Native sourced

Behaviour & biology

Diet
Carnivore sourced
Diet (detail)
Small crustaceans and bottom-dwelling invertebrates sourced
Social behaviour
Solitary inferred
Territorial
No inferred
Reproduction
Separate sexes sourced
Sexual dimorphism
No inferred
Seasonality
Present year-round in its habitat; no pronounced seasonality known. inferred
Special features
Small left-eyed flounder with a strikingly small mouth. sourced

For anglers

Edibility
Not eaten sourced
Fishing method
Not a target species for angling; at most an incidental catch or usable as baitfish. inferred
Regulations source
FishBase ↗ inferred

Safety

Danger to humans
Harmless sourced
First aid
None required: this species is harmless to humans. sourced

Status & sources

Sources
FishBase via GBIF (DwC-A), CC-BY-NC 4.0

Same genus Etropus

More from the family Paralichthyidae

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