Black goby
Fish · Last reviewed 2026-08-25
A dark goby of harbours, estuaries and soft ground — and the fish naturalists kept reporting from islands where it turned out not to live.
*Gobius niger* is the goby of soft ground and brackish water: harbours, estuaries, eelgrass beds and muddy sand, from Trondheim and the Baltic south through the Mediterranean and the Black Sea to Cape Blanc in Mauritania. FishBase records 25.3 cm and an age of five years, over a depth range of 1 to 96 m and usually inside 50.
It is stout and blunt-headed with the fused pelvic sucker every goby carries, and it is dark — brownish to almost black, with breeding males darkest of all — with the first dorsal fin often carrying an elongated ray and a dark spot at its base. It is separated from the rock goby by ground as much as by appearance: the rock goby is a fish of hard substrate and pools, and this is a fish of mud, sand and weed.
It has a place in the history of Atlantic-island misidentification. The annotated checklist of the marine fishes of the Azores records `Gobius niger` from that archipelago **only as a published misidentification of the rock goby**, by five separate authors between 1861 and 1924. A dark goby in an Atlantic-island harbour has been called a black goby for a century and a half, and the people who checked concluded it was something else — which is a useful thing to know before adding a sixth name to that list.
For an angler it is a light-tackle and species-hunting capture on baited bottom tackle in harbours and estuaries, and a well-known bait fish for bass and flatfish across its northern range.
Identification
No photograph of Black goby has passed identity review yet, so none is shown. FishingHQ publishes a species photograph only once somebody has confirmed the animal in it against the species record’s own diagnostic features.
- Scientific name
- Gobius niger
- Family
- Gobiidae
- Water
- Saltwater, Brackish
- Conservation status
- Least Concern
- Regions
- Western Europe, Britain & Ireland, Northern Europe, Mediterranean, North Africa
- Dark — brown to nearly black, with breeding males darkest — where the rock goby is mottled and paler.
- The first dorsal fin often carries an elongated ray and a dark blotch at its base.
- Two separate dorsal fins and the fused pelvic sucker under the belly, as all gobies have.
- GROUND is the practical separator: this is a fish of mud, sand, eelgrass and harbour bottom, and the rock goby is a fish of hard substrate and pools.
- FishBase records a maximum of 25.3 cm and an age of 5 years.
Size
- Typical
- 8–14 cm
- Large
- 17 cm and over
Exceptional: FishBase records a maximum of 25.3 cm and an age of 5 years
Lifecycle and reproduction
Demersal in marine and brackish water over a depth range of 1 to 96 m and usually inside 50 m, on soft and mixed ground including eelgrass. Medium resilience. Tolerant of the variable salinity of estuaries and harbours, which is most of why it is where it is.
Nest-guarding: males darken in the breeding season and guard eggs laid on the underside of a shell or stone. The colour change is the visible half of that and is the reason the darkest fish are the ones most likely to be called black gobies.
Feeding and senses
Takes small crustaceans, worms and molluscs from soft ground, ambushing from a resting position in short darts rather than hunting actively. Baited bottom tackle on the smallest hooks is what catches it deliberately.
Short-range bottom vision in frequently turbid harbour and estuary water, where scent does proportionately more work than it does for the rock-dwelling gobies.
Through the year
Present year-round across most of its range, moving into slightly deeper water in winter at the northern end. Breeding males are the conspicuous phase and are seasonal.
Distribution
Eastern Atlantic and Mediterranean Sea: throughout North Africa from Cape Blanc, Mauritania north and eastwards to the Suez Canal; also along the eastern Atlantic coast northwards to Trondheim (Norway) and Baltic Sea. Also known from the Black Sea
This is a biological range — where the species occurs, not a prediction that you will catch one. To browse the fishing geography FishingHQ holds, start at fishing places.
Why anglers care
A light-rock-fishing and species-hunting capture in harbours, estuaries and over soft ground across a very wide range, taken on the smallest baited hooks. It is also a long-established bait fish for bass and flatfish in northern Europe. Its wider significance is cautionary: it is the goby that has most often been reported from places it does not live, and the ground a dark goby was caught on is better evidence than its colour.
Handling and returning
Small, soft and easily damaged, with nothing that will hurt a hand. Wet hands, crushed barbs, unhook in the water, return quickly.
Where to go next
Similar and related fish
Where it lives
More fish
Not related to this page — just the rest of the section. There is little else joined to this subject yet, and a short page should still lead somewhere.
Sources and evidence
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Family, maximum size, depth range, environment, distribution and the IUCN assessment for Gobius niger.States this directlyPassage read and verified
- The IUCN Red List of Threatened Species — International Union for Conservation of Nature (Conservation authority)Relied on for: The Least Concern assessment for Gobius niger, assessed 15 July 2014.States this directlyCitation checked — the work exists and is described correctly
- Marine fishes of the Azores: an annotated checklist and bibliography — Santos, Porteiro & Barreiros — Arquipélago, Life and Marine Sciences, Supplement 1, University of the Azores, 1997 (Scientific literature)Relied on for: That Gobius niger is recorded from the Azores only as a published misidentification of Gobius paganellus, by five authors between 1861 and 1924.States this directlyPassage read and verified
Why the 3 connections on this page are here, and the sources
Similar and related fish
Backed by research — 1 connection
Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.
Rock goby
Gobius niger is a dark soft-ground fish of harbours, estuaries and eelgrass; Gobius paganellus is a mottled hard-substrate fish of rock and pools. The Azores annotated checklist records Gobius niger from that archipelago ONLY as a published misidentification of G. paganellus, by five authors between 1861 and 1924 — so ground is a better guide than colour.
- Marine fishes of the Azores: an annotated checklist and bibliography — Santos, Porteiro & Barreiros — Arquipélago, Life and Marine Sciences, Supplement 1, University of the Azores, 1997 (Scientific literature)Relied on for: Which species are recorded from the Azores, their Portuguese and Azorean vernacular names, and the published synonyms and misidentifications for each.States this directlyPassage read and verified
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: The morphology, size, depth range and distribution that separate these species from one another.States this directlyPassage read and verified
Where it lives
Backed by research — 2 connections
Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.
Estuary
Recorded as demersal in marine and brackish water over a depth range of 1 to 96 m from Trondheim and the Baltic to Cape Blanc and through the Mediterranean and Black Sea. Its salinity tolerance is what puts it in harbours and estuaries where the rock-dwelling gobies are not.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Environment, depth range, habitat association and distribution for Gobius niger.States this directlyPassage read and verified
Harbours, piers and breakwaters
A soft-ground goby tolerant of the variable salinity and turbidity of enclosed water, recorded over sand, mud and eelgrass throughout its range.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Environment, depth range, habitat association and distribution for Gobius niger.States this directlyPassage read and verified
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