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Norwegian topknot (Phrynorhombus norvegicus) — Scophthalmidae

Norwegian topknot

Phrynorhombus norvegicus
LC · Least Concern

The Norwegian topknot (Phrynorhombus norvegicus) is a saltwater fish of the family Scophthalmidae that grows up to 12 cm.

Length
12 cm
Water
Saltwater
Diet
Carnivore
Behaviour
Solitary
Activity
Nocturnal
Body shape
Flatfish
Substrate
Stone or rock
Danger
Harmless
Range
Northeast Atlantic and the North Sea, on rocky and stony bottoms from shallow to moderately deep water.
Edibility
Not eaten

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Description

The Norwegian topknot is a very small, left-eyed flatfish of the family Scophthalmidae reaching about 12 cm, one of the smallest flatfish in Europe. Both eyes lie on the left side, which is brown and mottled; the body is deep and almost oval, with a continuous fin fringe whose dorsal fin starts above the mouth. The species lives on rocky and stony bottoms of the north-eastern Atlantic and the North Sea, from shallow to moderate depths, often hidden among stones and weeds. On the bottom it hunts small crustaceans and worms. Like all flatfish the young start symmetrical and, after metamorphosis, sink onto their side to the bottom. Because of its small size it has no fishery importance.

Frequently asked questions

How do you recognise the Norwegian topknot?

The Norwegian topknot has a flatfish-shaped body, is mainly brown and shows a marbled pattern. Very small, left-eyed flatfish with a deep, oval shape and a brown marbled eyed side; the dorsal fin already begins above the mouth.

Where does the Norwegian topknot live?

The Norwegian topknot lives in the sea (marine waters) and is mostly found around stony or rocky ground. Northeast Atlantic and the North Sea, on rocky and stony bottoms from shallow to moderately deep water.

How big does the Norwegian topknot get?

The Norwegian topknot grows to a maximum of about 12 cm.

Is the Norwegian topknot dangerous to humans?

No, the Norwegian topknot is harmless to humans. None required: this species is harmless to humans.

Is the Norwegian topknot edible?

The Norwegian topknot is not usually eaten.

More photos

Norwegian topknot (Phrynorhombus norvegicus) — Scophthalmidae — 2
iNaturalist ((c) matty_munn, some rights reserved (CC BY-NC))
Norwegian topknot (Phrynorhombus norvegicus) — Scophthalmidae — 3
iNaturalist ((c) Cathy Hollingdale, some rights reserved (CC BY-NC))
Norwegian topknot (Phrynorhombus norvegicus) — Scophthalmidae — 4
iNaturalist ((c) cescgv, some rights reserved (CC BY-NC))

Easily confused with

These species look like the Norwegian topknot and live in the same waters.

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All data

Identification

English name
Norwegian topknot verified
Scientific name
Phrynorhombus norvegicus
Family
Scophthalmidae

Appearance

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

Habitat & distribution

Water type
Saltwater verified
Substrate
Stone or rock verified
Natural range
Northeast Atlantic and the North Sea, on rocky and stony bottoms from shallow to moderately deep water. verified
Origin
Native verified

Behaviour & biology

Diet
Carnivore verified
Diet (detail)
Small crustaceans and worms from the bottom sourced
Social behaviour
Solitary verified
Territorial
No verified
Activity
Nocturnal inferred
Reproduction
Separate sexes verified
Sexual dimorphism
No verified
Seasonality
Lives on rocky bottoms; the juvenile fish is still symmetrical and sinks to the bottom after metamorphosis. sourced
Special features
Very small, left-eyed flatfish with a deep, oval shape and a brown marbled eyed side; the dorsal fin already begins above the mouth. sourced

For anglers

Edibility
Not eaten verified
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 verified
First aid
None required: this species is harmless to humans. sourced

Status & sources

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

More from the family Scophthalmidae

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