European sea bass vs Thick-lipped grey mullet

How to tell them apart, and what follows from getting it right.

Why they get confused

Two silver fish with two dorsal fins in the same harbours, estuary mouths and gullies, usually seen from above or at the limit of visibility. From a distance the outline and the colour are close enough that each species' identification notes name the other as its standing confusion.

European sea bass

Dicentrarchus labrax — Moronidae

Thick-lipped grey mullet

Chelon labrosus — Mugilidae

The differences

Each difference is marked with how far it can be trusted on its own. A single diagnostic character settles the identification; suggestive ones only narrow it.

Differences between European sea bass and Thick-lipped grey mullet
Character	European sea bass	Thick-lipped grey mullet	Reliability
The mouthIdentification	Large and predatory, with the jaw reaching back to below the eye.	Small and toothless on a blunt, rounded head, set for grazing surfaces rather than seizing prey.	Diagnostic on its own
The upper lipIdentification	An ordinary thin lip on a wide gape.	Deep and fleshy, often with a row of small bumps along its lower edge.	Diagnostic on its own
The first dorsal finIdentification	A prominent first dorsal of stiff spines, with a clear gap before the soft second dorsal.	A small first dorsal of four spines set well forward of the second, with a wide gap between them.	Supporting — use with others
The gill coverHandling	A sharp spine on the gill cover and a saw edge along its rear margin, which is what cuts hands.	Smooth, with large scales running forward over the top of the head.	Supporting — use with others
Flank markingsIdentification	Plain bright silver on an adult; juveniles carry dark spots that adults lose.	Faint grey lines along the scale rows over silver, variable between fish.	Suggestive only — varies

Why it matters

The head settles it and the flank does not, so a fish seen only side-on at the edge of visibility has not been identified. The two are managed differently: bass carry size and catch rules that vary by country, season and method, and thick-lipped grey mullet grows slowly and is assessed as Near Threatened globally. Check the current rules with the fisheries authority for the water you are in.

The full species pages

This page compares two species. Each of them has a full page covering biology, behaviour, handling and the evidence behind all of it.

More about european sea bass

Where it lives, how it is caught, and what else it is confused with.

Similar and related fish

Thick-lipped grey mulletThe standing confusion from a harbour wall or at the edge of underwater visibility — the mouth settles it.
Atlantic mackerelSmall mackerel are taken by bass, which is part of why silver, mackerel-profile lures work inshore in summer.
European spratAutumn and winter sprat shoals moving inshore are followed by bass, and a sprat shoal in a bay is one of the more reliable indications that bass are present.
Japanese sea bassUnrelated genera occupying equivalent estuarine niches and both called sea bass in english.

1 more

Lesser sandeel Fish

How it is caught

Saltwater fly fishingThe fish British and Irish coastal fly fishing is built on: a visual hunter that pushes into water shallow enough to wade, feeds on a flooding tide over ground that was dry an hour earlier, and will take on the surface.
Drop shottingSoft plastics fished with a controlled drop over reef and in estuary channels, worked slowly for fish that are holding rather than hunting.
Float fishingA live or fresh bait suspended over rough ground and around harbour structure, which reaches fish holding above snags that a leger cannot be fished over.
Kayak fishingA kayak reaches inshore reef and estuary ground that is too far to wade to and too shallow or too small to take a boat into, which is precisely the ground bass feed over. It is the clearest case of the platform opening water rather than a technique.

3 more

Gear for this fish

Peeler crabThe most highly regarded shore bait in British sea angling for bass, and the reasoning is biological rather than traditional: a crab that has just shed its shell is defenceless and briefly abundant, and bass feed on exactly that.
Crab and shellfishPeeler crab during the moulting season is the outstanding bass bait, and the reason a great many anglers spend more time collecting than fishing.
JerkbaitsA shallow-diving minnow worked across a tide line imitates a disoriented baitfish being carried, which is the specific thing bass are hunting when they sit on the downtide edge of a reef or a bar.
Metal jigsA small casting metal buys distance in wind and gets under the surface when bass are feeding deeper than a surface lure or a shallow minnow will reach — usually the answer in a big sea rather than a fine-weather one.

6 more

Where it lives

EstuaryBass use estuaries heavily, and juveniles depend on them as nursery habitat — which is why estuary nursery areas are a standard instrument of bass management.
Seagrass bedsSeagrass is nursery habitat for juvenile bass and hunting ground for adults working the edges, which is why an eelgrass bed in an estuary is worth more to the fishery than its area suggests.
Surf beachesBass hunt in broken water where turbulence disorients prey — which is why surf beaches fish better with some sea running.
Rocky shores and reefsHard, structurally complex ground with kelp, gullies and broken rock — the richest inshore habitat, and the most dangerous to fish from.

Why the 26 connections on this page are here, and the sources

Similar and related fish

Backed by research — 5 connections

Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.

Thick-lipped grey mullet
Unrelated fish — a moronid predator and a mugilid grazer — that share harbours and estuary mouths and are separated by the mouth, the upper lip and the first dorsal fin.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: The family placement and diagnostic morphology of Dicentrarchus labrax and Chelon labrosus, including dorsal spine counts and mouth form.States this directlyPassage read and verified
Unrelated fish — a moronid predator and a mugilid grazer — that share harbours and estuary mouths and are separated by the mouth, the upper lip and the first dorsal fin.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: The family placement and diagnostic morphology of Dicentrarchus labrax and Chelon labrosus, including dorsal spine counts and mouth form.States this directlyPassage read and verified
Atlantic mackerel
Bass diet includes small pelagic fish; mackerel are recorded among them.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Diet composition records for Dicentrarchus labrax including small pelagic fish.States this directlyPassage read and verified
- Cefas science, advice and data on marine and freshwater environments — Centre for Environment, Fisheries and Aquaculture Science (Government fisheries body)Relied on for: Bass feeding ecology in inshore waters.FishingHQ's interpretation of what it saysCitation checked — the work exists and is described correctly
European sprat
Recorded diet evidence identifies Sprattus sprattus as a food item of this predator at species level. The edge is written at that granularity and no further.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Food items recorded for this predator, including Sprattus sprattus.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: Species account describing the diet of this predator in the region where Sprattus sprattus occurs.Background and mechanism onlyCitation checked — the work exists and is described correctly
Japanese sea bass
An identification comparison naming both binomials: Lateolabrax japonicus and Dicentrarchus labrax.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Morphological and distributional data for Lateolabrax japonicus and for Dicentrarchus labrax.States this directlyPassage read and verified
- The IUCN Red List of Threatened Species — International Union for Conservation of Nature (Conservation authority)Relied on for: Separate assessments treating Lateolabrax japonicus and Dicentrarchus labrax as distinct species.States this directlyCitation checked — the work exists and is described correctly
Lesser sandeel
Recorded diet evidence identifies Ammodytes marinus as a food item of this predator at species level. The edge is written at that granularity and no further.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Food items recorded for this predator, including Ammodytes marinus.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: Species account describing the diet of this predator in the region where Ammodytes marinus occurs.Background and mechanism onlyCitation checked — the work exists and is described correctly

How it is caught

What experienced anglers do — 7 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.

Saltwater fly fishing
An established way this species is taken recreationally in north-west European waters.
- 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 species to this method, recorded as practitioner consensus rather than as tested fact.Background and mechanism onlyCitation checked — the work exists and is described correctly
A species joined to a method genuinely used for it, on the strength of the biology that makes the method work rather than on the fact that somebody has tried it.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Diet, habitat association, depth range, feeding behaviour and seasonal movement recorded for the species concerned.States this directlyPassage read and verified
- The Fishes of the British Isles and North-West Europe — Macmillan, 1969 (Reference work)Relied on for: Distribution, habitat and biology of the fishes of the British Isles and north-west Europe.States this directlyCitation checked — the work exists and is described correctly
A statement about how a species is fished, which is angling convention rather than biology and is labelled as such.
- Still Water Fly-Fishing — Andre Deutsch, 1952 (Specialist angling publication)Relied on for: Fly-fishing practice from a practitioner tradition: line control, depth management, retrieve and the reading of water.States this directlyCitation checked — the work exists and is described correctly
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK sea angling practice as reported by practitioners: ground, tackle, presentation and seasonal timing.States this directlyCitation checked — the work exists and is described correctly
Drop shotting
An established way this species is taken recreationally in north-west European waters.
- 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 species to this method, recorded as practitioner consensus rather than as tested fact.Background and mechanism onlyCitation checked — the work exists and is described correctly
Float fishing
An established way this species is taken recreationally in north-west European waters.
- 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 species to this method, recorded as practitioner consensus rather than as tested fact.Background and mechanism onlyCitation checked — the work exists and is described correctly
Kayak fishing
Established angling practice for this species, recorded as convention. The note states the property of the animal or its water that makes the method the answer.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Established sea-angling technique and its application to this species.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 species and method.Background and mechanism onlyCitation checked — the work exists and is described correctly
Popping and stickbaiting
An established way this species is taken recreationally in north-west European waters.
- 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 species to this method, recorded as practitioner consensus rather than as tested fact.Background and mechanism onlyCitation checked — the work exists and is described correctly
Spinning
Well-established and independently described.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Shore lure practice for bass.Citation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary shore lure practice.Citation checked — the work exists and is described correctly
Surfcasting
Established shore practice, independently described.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Shore bait practice for bass.Citation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary bass practice from a separate editorial tradition.Citation checked — the work exists and is described correctly

Gear for this fish

What experienced anglers do — 10 connections

Peeler crab
Long-established and independently described sea angling practice.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Peeler crab as a bass bait and its seasonal availability.Citation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary peeler crab practice from a separate editorial tradition.Citation checked — the work exists and is described correctly
Established angling convention about what a bait is used for. Convention is what this is, and labelling it as convention is what stops it being read as a tested result.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK sea angling practice as reported and restated by practitioners, including shore technique, bait use and species behaviour.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 angling practice and belief, recorded as practitioner consensus rather than as tested fact.Background and mechanism onlyCitation checked — the work exists and is described correctly
Crab and shellfish
A practitioner claim about a species-bait pairing.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Practitioner treatment of peeler crab as a bass bait through the moulting season.Citation 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: The inshore and estuarine habitat use of European sea bass that puts it on the ground where peeler crab is found.Citation checked — the work exists and is described correctly
Jerkbaits
A practitioner claim about which lure family answers this species' feeding or holding behaviour.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Established shore and boat lure practice for the species in north-west European seas.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 lure selection for this species, recorded as practitioner consensus rather than as tested fact.Background and mechanism onlyCitation checked — the work exists and is described correctly
Metal jigs
A practitioner claim about which lure family answers this species' feeding or holding behaviour.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Established shore and boat lure practice for the species in north-west European seas.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 lure selection for this species, recorded as practitioner consensus rather than as tested fact.Background and mechanism onlyCitation checked — the work exists and is described correctly
Sand eel
A practitioner claim about a bait-species pairing, with the underlying forage relationship supported separately.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Practitioner treatment of sand eel as a bass bait, live and frozen.Citation 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: The inshore habitat use and diet of European sea bass, including small forage fish.Citation checked — the work exists and is described correctly
Soft plastics
A practitioner claim about which lure family answers this species' feeding or holding behaviour.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Established shore and boat lure practice for the species in north-west European seas.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 lure selection for this species, recorded as practitioner consensus rather than as tested fact.Background and mechanism onlyCitation checked — the work exists and is described correctly
Streamers
What anglers actually use a method or a lure for, recorded as convention.
- Still Water Fly-Fishing — Andre Deutsch, 1952 (Specialist angling publication)Relied on for: Fly-fishing practice from a practitioner tradition: line control, depth management, retrieve and the reading of water.States this directlyCitation checked — the work exists and is described correctly
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK sea angling practice as reported by practitioners: ground, tackle, presentation and seasonal timing.States this directlyCitation checked — the work exists and is described correctly
Surface lures
Established shore lure practice, independently described.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Surface lure practice for bass.Citation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary topwater practice from a separate tradition.Citation checked — the work exists and is described correctly
Uptide rig
That anglers conventionally choose this arrangement when targeting this fish. It is a claim about practice rather than about the fish, and it does not assert that the arrangement is necessary or that it will succeed.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Long-running published description of British sea angling practice, including boat and shore terminal arrangements, grip leads and the conditions each is chosen for.States this directlyCitation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary UK angling practice as reported by practitioners, including sea terminal tackle convention and its development.States this directlyCitation checked — the work exists and is described correctly
Ragworm
Established sea angling practice, independently described.
- Sea Angler — Bauer Media (Specialist angling publication)Relied on for: Ragworm as an inshore bait for bass and flatfish.Citation checked — the work exists and is described correctly
- Angling Times — Bauer Media (Specialist angling publication)Relied on for: Contemporary ragworm practice.Citation checked — the work exists and is described correctly

Where it lives

Backed by research — 4 connections

Supported by peer-reviewed research or fisheries science. The sources are listed and can be checked.

Estuary
A habitat and life-history claim held to a scientific standard, because it underpins a management measure rather than a technique.
- Cefas science, advice and data on marine and freshwater environments — Centre for Environment, Fisheries and Aquaculture Science (Government fisheries body)Relied on for: The role of estuarine nursery areas in the life history of European sea bass.States this directlyCitation checked — the work exists and is described correctly
- ICES Advice on fishing opportunities, catch and effort — International Council for the Exploration of the Sea (Scientific institute)Relied on for: Stock assessment context for European sea bass including nursery habitat.Background and mechanism onlyCitation checked — the work exists and is described correctly
Seagrass beds
A habitat association resting on the regional identification and fisheries literature rather than on angling report.
- JNCC species and habitat conservation advice — Joint Nature Conservation Committee (Conservation authority)Relied on for: UK and European habitat classification and the conservation status of seagrass beds, including the species associated with them.States this directlyCitation checked — the work exists and is described correctly
- 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: Habitat association and distribution of the species concerned.States this directlyCitation checked — the work exists and is described correctly
Surf beaches
Habitat use and feeding behaviour are documented.
- Cefas science, advice and data on marine and freshwater environments — Centre for Environment, Fisheries and Aquaculture Science (Government fisheries body)Relied on for: Bass habitat use, inshore movements and nursery area dependence.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: Habitat and salinity tolerance records for Dicentrarchus labrax.States this directlyPassage read and verified
Rocky shores and reefs
Recorded habitat association.
- FishBase: a global information system on fishes — Froese, R. and D. Pauly, eds. — FishBase Consortium (Scientific institute)Relied on for: Habitat records for Dicentrarchus labrax including rocky inshore ground.States this directlyPassage read and verified
- Cefas science, advice and data on marine and freshwater environments — Centre for Environment, Fisheries and Aquaculture Science (Government fisheries body)Relied on for: Inshore habitat use by bass.FishingHQ's interpretation of what it saysCitation checked — the work exists and is described correctly

Share this page

Reviewed 2026-10-10. FishingHQ does not state what any rule is or where any rule applies. Where this page says the two species are managed differently, that is a reason to check the authority for the water you are on — not a statement of what it requires.