Thicklip mullet (Chelon labrosus)

Thicklip mullet
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Thicklip mullet fact file

Thicklip mullet description

GenusChelon (1)

The thicklip mullet (Chelon labrosus), named for its extraordinarily thick, swollen-looking upper lip, is a fairly common fish in seas around Europe (3) (4). It has an elongated, cylindrical-shaped body with a notably broad, flattened head and a forked tail (5) (6). The two dorsal fins are short and widely separated, with the spiny first fin having four slender spines and the softer second having nine or ten soft rays (3) (5). The pectoral fins are positioned rather high up the body (5). The thicklip mullet is dark grey above, often with a greenish tinge, silver on the underside, and light grey with long, dark smudges on the sides. The fins are dark grey in colour (6).

Also known as
grey mullet, thick lipped grey mullet, thicklip grey mullet, thick-lipped grey mullet, thicklipped mullet.
Bâtarde, Labre, Lenket, Lissa, Meil, Muge à Grosses Lèvres, Muge Lippu, Muge Noir à Grosses Lèvres, Muge Noir Blanc, Muge Noir Chaluc, Muge Noir Labru, Mugon Labru, Mulet à Grosses Lèvres, Mulet Labeon Chaluc, Mulet Labeon Lippu, Mulet Lippu, œil Noir, Ueil Nègre.
Lisa Negra, Muble.
Maximum length: 35 cm (2)
Maximum weight: 4.5 kg (2)

Thicklip mullet biology

The thicklip mullet breeds in deep, offshore waters between July and August in British and Irish waters, but earlier in the year in more southerly parts of its range. Eggs and sperm are released simultaneously into the water, with the developing larvae subsequently floating in the water currents as part of the zooplankton community (3). When they reach around two centimetres in length, the young fish move to sheltered coastal lagoons and estuaries (1) (3). They reach sexual maturity at around 30 to 35 centimetres in length and an age of 2 to 4 years, with the male fish first breeding before the females (1) (3).  The thicklip mullet is reported to live for up to 12 years (1)

Whilst travelling in large schools, adult thicklip mullets feed on algae, aquatic plant detritus and small invertebrates. The juveniles feed on zooplankton (3)


Thicklip mullet range

The thicklip mullet is found in the Eastern Atlantic, ranging from Cape Verde and Senegal to southern Norway, southern Iceland and the Faroe Islands, and eastwards to the Mediterranean Sea and the western Black Sea. Since the mid-1960s its range has steadily expanded from the North Sea into the western Baltic Sea (1) (3) (6).


Thicklip mullet habitat

With a broad tolerance of different salinities and temperatures, the thicklip mullet resides in coastal and estuarine waters during the spring and summer and migrates to deeper offshore waters before winter (1) (3) (4) (6).


Thicklip mullet status

The thicklip mullet is classified as Least Concern (LC) on the IUCN Red List (1).

IUCN Red List species status – Least Concern


Thicklip mullet threats

A widespread species, there are not thought to be any major threats to the thicklip mullet, although information on its abundance is limited (1) (2). It is a valued commercial fish species and is harvested for food across its range (7)


Thicklip mullet conservation

As a fairly important commercial fish species, regulations are in place to control the size of thicklip mullets which can be harvested and, as such, fish under 35 centimetres in length may not be taken (2) (7).

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Simple plants that lack roots, stems and leaves but contain the green pigment chlorophyll. Most occur in marine and freshwater habitats.
Litter formed from fragments of dead material.
Dorsal fin
The unpaired fin found on the back of the body of fish, or the raised structure on the back of most cetaceans.
Animals with no backbone, such as insects, worms, spiders, corals, and others.
Stage in an animal’s lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
Pectoral fins
In fish, the pair of fins that are found one on each side of the body just behind the gills. They are generally used for balancing and braking.
Tiny aquatic animals that drift with currents or swim weakly in water.


  1. IUCN Red List (November, 2010)
  2. Fish Online – Thicklip mullet (November, 2010)
  3. FishBase – Thicklip mullet (November, 2010)
  4. Hayward, P.J. and Ryland, J.S. (1995) Handbook of the Marine Fauna of North-West Europe. Oxford University Press, Oxford.
  5. Carpenter, K.E. and Niem, V.H. (2001) The Living Marine Resources of the Western Central Pacific. Volume 4: Bony Fishes Part 4 (Mugilidae to Carangidae). Food and Agriculture Organisation of the United Nations, Rome.
  6. Czerniejewski, P., Keszka, S. and Rybczyk, A. (2008) Chelon labrosus (Risso, 1827) – the first record from Lake Dąbie. Oceanologia, 50: 281-284.
  7. South Wales Sea Fisheries Committee – Thicklip mullet (November, 2010)

Image credit

Thicklip mullet  
Thicklip mullet

© Jose B. Ruiz /

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