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Knout goby (Mesogobius batrachocephalus) — Gobiidae

Knout goby

Mesogobius batrachocephalus
Family: Gobiidae
LC · Least Concern

The Knout goby (Mesogobius batrachocephalus) is a brackish-water fish of the family Gobiidae that grows up to 35 cm.

Length
35 cm
Water
Brackish
Depth
20.0–100.0 m
Diet
Carnivore
Behaviour
Solitary
Activity
Nocturnal
Body shape
Torpedo-shaped
Substrate
Sand / mud bottom
Danger
Harmless
Range
Ponto-Caspian region: brackish and fresh water of the Black Sea, the Sea of Azov and the Caspian Sea, with the lower reaches of rivers and coastal lagoons.
Edibility
Commonly eaten

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Description

The knout goby is a robust goby of the family Gobiidae reaching about 35 cm, one of the largest gobies of the Black Sea. Characteristic is the broad, flattened head that recalls a frog; the brownish body bears a few dark saddle blotches. Like other gobies the pelvic fins are fused into a sucking disc. The species comes from the Ponto-Caspian region and lives on sand and mud bottoms of brackish and fresh water of the Black, Azov and Caspian Seas. As a predatory goby it hunts small fish, crustaceans and worms. In spring the male guards the eggs laid under a stone or shell. Because of its size it is locally a valued sport and food fish.

Frequently asked questions

How do you recognise the Knout goby?

The Knout goby has a torpedo-shaped body, is mainly brown and shows a spots pattern. Robust Ponto-Caspian goby with a broad, flattened 'frog head' and a few dark saddle blotches; one of the largest gobies of the Black Sea.

Where does the Knout goby live?

The Knout goby lives in brackish water and is mostly found around sand or mud bottom. Ponto-Caspian region: brackish and fresh water of the Black Sea, the Sea of Azov and the Caspian Sea, with the lower reaches of rivers and coastal lagoons.

How big does the Knout goby get?

The Knout goby grows to a maximum of about 35 cm.

Is the Knout goby dangerous to humans?

No, the Knout goby is harmless to humans. None required: this species is harmless to humans.

Is the Knout goby edible?

Yes, the Knout goby is commonly eaten.

More photos

Knout goby (Mesogobius batrachocephalus) — Gobiidae — 2
iNaturalist ((c) Viktor Strenada, some rights reserved (CC BY-NC))
Knout goby (Mesogobius batrachocephalus) — Gobiidae — 3
iNaturalist ((c) Yurij Ivancea, some rights reserved (CC BY-NC))
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All data

Identification

English name
Knout goby verified
Scientific name
Mesogobius batrachocephalus
Family
Gobiidae
Other names
Knout goby; Toad goby verified

Appearance

Size class
Medium verified
Max length (cm)
35.0 verified
Body shape
Torpedo-shaped sourced
Dominant colour
Brown sourced
Pattern
Spots sourced
Tail shape
Rounded inferred
Mouth position
Terminal inferred
Lips
Thick / fleshy inferred
Barbels
No verified
Dorsal fins
Two separate sourced
Dorsal spines
Yes verified

Habitat & distribution

Water type
Brackish verified
Substrate
Sand / mud bottom verified
Min depth (m)
20.0 verified
Max depth (m)
100.0 verified
Natural range
Ponto-Caspian region: brackish and fresh water of the Black Sea, the Sea of Azov and the Caspian Sea, with the lower reaches of rivers and coastal lagoons. verified
Origin
Native verified

Behaviour & biology

Diet
Carnivore verified
Diet (detail)
Small fishes, crustaceans and worms from the bottom sourced
Social behaviour
Solitary verified
Territorial
Yes verified
Activity
Nocturnal inferred
Reproduction
Separate sexes verified
Sexual dimorphism
No verified
levensduur_max_jaar
8.0 verified
Seasonality
Bottom-dweller; in spring the male guards the eggs laid under a stone or shell. sourced
Special features
Robust Ponto-Caspian goby with a broad, flattened 'frog head' and a few dark saddle blotches; one of the largest gobies of the Black Sea. sourced

For anglers

Edibility
Commonly eaten verified
Fishing method
Angling with worm, shrimp or a small fish on the bottom in brackish coastal waters; locally a prized catch sourced
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 Gobiidae

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