How to identify thick-lipped grey mullet
Chelon labrosus · Mugilidae
The characters that identify thick-lipped grey mullet, ranked by how far each one can be trusted on its own.
Look at this first
The whole identification is in the upper lip. On this species it is deep and fleshy, thicker than the eye's diameter in a decent fish and often carrying small bumps along its lower edge. The thin-lipped mullet's upper lip is a narrow strip by comparison.
Diagnostic — settles it on its own
Each of these settles the identification on its own. If one is clear, you have your answer.
A deep fleshy upper lip
Noticeably thick, with a row of small papillae along its lower margin in most adults. It is the character that names the species and it is checked in one look at a fish in hand. Thin-lipped mullet has nothing resembling it.
Supporting — use with other characters
Real characters that are not conclusive by themselves. Use two or three together.
Two widely separated dorsal fins
The first dorsal carries four spines and sits well forward of the second, with a clear gap between. It places the fish among the mullets and, taken with the small mouth, rules out bass entirely.
A blunt head with a small toothless mouth
The head is rounded and the mouth small, set for grazing rather than seizing. Anybody who has confused a mullet with a bass from a distance resolves it the moment the head is visible.
Scales running forward onto the head
Large scales extending across the top of the head towards the snout, which is characteristic of the family. Useful for placing the fish and no use at all for separating the mullets from one another.
Suggestive only — varies with condition
Hints only. These vary with condition, season, water and how long the fish has been out of it, and a fish that contradicts them is still the same species.
Grey lines along the flank
Faint longitudinal stripes following the scale rows over silver. Present in several mullet species and variable within each, so it is scene-setting rather than evidence.
What it gets confused with
- Thin-lipped grey mullet, which is the whole reason this page exists. Look at the upper lip and nothing else.
- Golden grey mullet, which carries a distinct gold patch on the gill cover.
- European sea bass at a distance in a harbour, until either fish's mouth becomes visible.
Side by side: Thick-lipped grey mullet vs Flathead grey mullet.
Where this stops working
Lip thickness is a proportion rather than a measurement and it is less pronounced on small fish, so juveniles are considerably harder than adults. The grey mullets hybridise and mixed shoals of two or three species in the same estuary are normal. The species is assessed as Near Threatened globally and grows slowly, which is worth knowing before deciding whether to keep one.
The full record
This page covers identification only. The Thick-lipped grey mullet record covers behaviour, lifecycle, distribution, handling and the sources behind all of it.
Reviewed 2026-08-14.
More about this fish
Telling it apart is one question. Here are the others.
Similar and related fish
What these connections rest on (1)
Scientific evidence — 1 connection
Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.
Flathead grey mullet
A comparison resting on shared family and feeding ecology, naming both binomials.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: That Mugil cephalus and Chelon labrosus are both Mugilidae feeding on detritus and organic material in coastal and estuarine water.States this directlyPassage read and verified
How it is caught
- Float fishingFine tackle and small baits presented at a set depth in harbours and creeks, which is the classic approach to a fish that inspects everything.
- LedgeringA light leger in flowing harbour and estuary water, used where a float cannot be controlled or where fish are feeding on the bottom.
- Saltwater fly fishingAn established specialist approach, imitating the algae, maggots and small crustaceans mullet graze on rather than presenting a baitfish pattern.
What these connections rest on (3)
Practitioner consensus — 3 connections
Widely and independently recommended by experienced anglers and specialist sources. This is real angling knowledge, not proof: controlled evidence for it is limited, and FishingHQ records it as convention rather than as a demonstrated effect.
Float fishing
An established way this species is taken recreationally in north-west European waters, recorded because it is true rather than because it satisfies a gate.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Shore and boat practice in north-west European sea angling for the species and method described, presented across multiple independent contributors.States this directlyCitation checked — the work exists and is described correctly
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated practice connecting this quarry to this method, recorded as practitioner consensus rather than as tested fact.Background and mechanism onlyCitation checked — the work exists and is described correctly
Ledgering
An established way this species is taken recreationally in north-west European waters, recorded because it is true rather than because it satisfies a gate.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Shore and boat practice in north-west European sea angling for the species and method described, presented across multiple independent contributors.States this directlyCitation checked — the work exists and is described correctly
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated practice connecting this quarry to this method, recorded as practitioner consensus rather than as tested fact.Background and mechanism onlyCitation checked — the work exists and is described correctly
Saltwater fly fishing
An established way this species is taken recreationally in north-west European waters, recorded because it is true rather than because it satisfies a gate.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Shore and boat practice in north-west European sea angling for the species and method described, presented across multiple independent contributors.States this directlyCitation checked — the work exists and is described correctly
- General angling website restatements of established technique — Various (Credible secondary source)Relied on for: Widely restated practice connecting this quarry to this method, recorded as practitioner consensus rather than as tested fact.Background and mechanism onlyCitation checked — the work exists and is described correctly
Where it lives
What these connections rest on (1)
Scientific evidence — 1 connection
Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.
Estuary
A habitat and salinity-tolerance claim held to a scientific standard, because the tolerance is the biological fact that explains everything about where the fish is found.
- The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Estuarine and brackish habitat use and the feeding habits of Chelon labrosus on fine organic material.States this directlyCitation checked — the work exists and is described correctly
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Recorded habitat and salinity tolerance for Chelon labrosus.States this directlyPassage read and verified
Where you will find it
- AngleseyThe harbours, the strait and the sheltered creeks hold a mullet fishery among the better ones in Wales, and it is the fishery most visitors walk past.
- CyprusThe harbour quarry that most rewards effort, and the one that makes the island's fine-tackle-and-groundbait approach make sense. Mullet in clear, tideless, heavily-watched harbour water are as technical a proposition as anything in European shore fishing.
- Morecambe Bay and the north-west England coastIn the creeks and around the freshwater outfalls through the summer, in the numbers estuaries of this kind always hold and with the difficulty they always present.
- Pembrokeshire and the south-west Wales coastIn Milford Haven, the estuaries and the harbours through the warmer months, which is a quite different water from the exposed coast a few miles seaward.
- The Atlantic coast of IrelandAssociated with the sheltered bays, sea inlets, harbours and estuary mouths of this coast rather than with its exposed rock, and present through the warmer months.
- The Black SeaThe mainstay of shore fishing across the whole basin, and it is there because of the salinity. Mullet tolerate dilute and brackish water better than almost any other marine fish, which is exactly what a sea at half Mediterranean salinity with enormous river inputs selects for.
- The Isles of ScillyIn the harbours and shallow bays in exceptional clarity, which makes them substantially harder rather than easier to catch.
- The Severn EstuaryExploits the organic-rich margins and harbours of the estuary, feeding on the surface film and sediment.
2 more
- The Solent and the Hampshire coast Fishing regions
- The Thames Estuary Fishing regions
What these connections rest on (10)
Scientific evidence — 10 connections
Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.
Anglesey
A distributional claim about where a species occurs, which is a claim about the world and rests on the reference literature rather than on angling report.
- The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution, habitat association and biology of the fishes of the British Isles and north-west Europe.States this directlyCitation checked — the work exists and is described correctly
- Cefas science, advice and data on marine and freshwater environments — Centre for Environment, Fisheries and Aquaculture Science (Government fisheries body)Relied on for: UK marine fisheries science: distribution, survey data and the biological basis of management advice.States this directlyCitation checked — the work exists and is described correctly
Cyprus
A distribution edge resting on published regional identification and distribution references, written where the species is genuinely characteristic of the destination's fishing rather than merely recorded from its waters.
- FAO Species Identification Guides for Fishery Purposes and the FAO Species Catalogues — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Distribution, habitat association and biology of the fishes of the eastern central Atlantic and the Mediterranean, from the regional identification guides prepared for fishery purposes.States this directlyCitation checked — the work exists and is described correctly
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Recorded environment, depth range, distribution and biology of the species named.States this directlyPassage read and verified
Morecambe Bay and the north-west England coast
A claim that a place contains the ground, water and seasonal conditions the species is associated with. It is a distributional statement about the world, it rests on the regional reference literature, and it deliberately asserts nothing about access, permission or catch.
- The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution and habitat association of the marine, estuarine and freshwater fishes of the British Isles, including which coasts and ground types a species occupies.States this directlyCitation checked — the work exists and is described correctly
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Recorded distribution, depth range and habitat association for the species named.States this directlyPassage read and verified
Pembrokeshire and the south-west Wales coast
A claim that a place contains the ground, water and seasonal conditions the species is associated with. It is a distributional statement about the world, it rests on the regional reference literature, and it deliberately asserts nothing about access, permission or catch.
- The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution and habitat association of the marine, estuarine and freshwater fishes of the British Isles, including which coasts and ground types a species occupies.States this directlyCitation checked — the work exists and is described correctly
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Recorded distribution, depth range and habitat association for the species named.States this directlyPassage read and verified
The Atlantic coast of Ireland
A claim that a place contains the ground and conditions the species is associated with. It is a distributional statement about the world, it rests on the regional reference literature, and it deliberately asserts nothing about access, permission or catch.
- The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution and habitat association of the marine and estuarine fishes of the British Isles, including which coasts and ground types a species occupies.States this directlyCitation checked — the work exists and is described correctly
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Recorded distribution, depth range and habitat association for the species named.States this directlyPassage read and verified
The Black Sea
A distribution edge resting on published identification and distribution references rather than on angling report, written where the species is genuinely characteristic of the system rather than merely recorded in it once.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Recorded environment, salinity tolerance, depth range, distribution and biology of the species named.States this directlyPassage read and verified
- FAO Species Identification Guides for Fishery Purposes and the FAO Species Catalogues — Food and Agriculture Organization of the United Nations (Scientific institute)Relied on for: Distribution, habitat association and identification of the fishes of the Mediterranean and Black Sea region.States this directlyCitation checked — the work exists and is described correctly
The Isles of Scilly
A claim that a place contains the ground, water and seasonal conditions the species is associated with. It is a distributional statement about the world, it rests on the regional reference literature, and it deliberately asserts nothing about access, permission or catch.
- The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution and habitat association of the marine, estuarine and freshwater fishes of the British Isles, including which coasts, estuaries and ground types a species occupies.States this directlyCitation checked — the work exists and is described correctly
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Recorded distribution, depth range and habitat association for the species named.States this directlyPassage read and verified
The Severn Estuary
A distribution association between an animal and a described water body, which is what the `inhabits` predicate is for — the kind of water rather than a named mark.
- The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution, habitat association, depth and ground preference of fishes in British and north-west European waters.States this directlyCitation checked — the work exists and is described correctly
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Distribution, habitat association and depth range recorded for the species.Background and mechanism onlyPassage read and verified
The Solent and the Hampshire coast
A claim that a place contains the ground, water and seasonal conditions the species is associated with. It is a distributional statement about the world, it rests on the regional reference literature, and it deliberately asserts nothing about access, permission or catch.
- The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution and habitat association of the marine, estuarine and freshwater fishes of the British Isles, including which coasts, estuaries and ground types a species occupies.States this directlyCitation checked — the work exists and is described correctly
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Recorded distribution, depth range and habitat association for the species named.States this directlyPassage read and verified
The Thames Estuary
A claim that a place contains the ground, water and seasonal conditions the species is associated with. It is a distributional statement about the world, it rests on the regional reference literature, and it deliberately asserts nothing about access, permission or catch.
- The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution and habitat association of the marine, estuarine and freshwater fishes of the British Isles, including which coasts, estuaries and ground types a species occupies.States this directlyCitation checked — the work exists and is described correctly
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Recorded distribution, depth range and habitat association for the species named.States this directlyPassage read and verified