Common sole
A prized flatfish from the Atlantic and Mediterranean seabeds.
The common sole is a flatfish species found in the northern Atlantic and Mediterranean. It lives buried in sand or mud and feeds on small invertebrates at night. Chefs value its firm, mild fillets, though sustainability concerns have led to its inclusion on seafood red lists due to fishing pressures.
- Both eyes are on the right side of the body.
- Prized for mild, buttery flavour and firm fillets.
- Nocturnal feeder hiding in sand or mud.
- Added to Greenpeace seafood red list in 2010.
- Can live up to 26 years in the wild.
What it is
The common sole is a large member of the Solea genus within the flatfish family Soleidae. Its body is oval and flattened, with both small eyes located on the right side. This adaptation allows it to lie half-buried in sediment while watching for prey. The upper surface is greyish-brown to blend with the seabed, while the underside remains white. Adults can reach lengths of up to 70 cm. In the United Kingdom, smaller specimens are often marketed under the name slip.
Where it lives
This species inhabits the Eastern Atlantic Ocean, ranging from southern Norway down to Senegal. It is also widespread throughout the Mediterranean Sea. The fish prefers relatively shallow waters between 10 and 60 metres deep, where the bottom consists of sand or mud. It can survive at depths of up to 200 metres. Ideal temperatures range from 8 to 24 degrees Celsius. During winter months, populations often move to the warmer waters of the southern North Sea.
How it lives
The Dover sole is a nocturnal feeder that hunts for worms, molluscs, and crustaceans. It spends much of its day partially immersed in the sandy substrate to avoid detection. A specific leech, Hemibdella soleae, acts as an ectoparasite on this fish. The larvae of this leech attach to the exposed upper surface of the sole before migrating to the underside to feed on blood. This parasite exploits the fact that the rest of the fish remains buried in the sediment.
Breeding and life cycle
Reproductive maturity is reached between three and five years of age. Spawning typically takes place from February to May, although warmer regions may see activity start in early winter. The process occurs in shallow coastal waters with temperatures between 6 and 12 degrees Celsius. After fertilisation, eggs incubate for approximately five days. The resulting larvae transform into juvenile fish after about 35 days. The maximum recorded lifespan for this species is 26 years.
Fish and people
Chefs highly prize this fish for its sweet, buttery flavour and firm texture. The fillets hold together well during cooking, making them versatile for various dishes. The name Dover sole originates from the English port of Dover, which landed the highest volume of this catch in the 19th century. It is primarily caught using bottom trawling methods. The prestige of the name has led to other species, such as the Pacific sole, borrowing it despite having different culinary qualities.
Status and threats
In 2010, Greenpeace International placed the common sole on its seafood red list. This list highlights fish commonly sold in supermarkets that face a high risk of coming from unsustainable fisheries. The designation reflects concerns over fishing practices and stock levels. While the species remains popular in cuisine, this classification urges caution regarding its sourcing and long-term viability in commercial markets.
Questions people ask about Common sole
Why is it called Dover sole?
The name comes from the English fishing port of Dover. In the 19th century, this port landed more of this specific fish than any other location, leading to the association between the place and the species.
Is the Pacific Dover sole the same fish?
No, the Pacific sole is a distinct species named after the common sole due to its prestige. It has thinner, less firm fillets and sells for a lower price, differing significantly in culinary properties.
What does the common sole eat?
It feeds at night on a diet consisting mainly of worms, molluscs, and crustaceans. It uses its camouflage to lurk half-buried in the sand, waiting for passing prey to come within reach.
How big do common soles get?
They are one of the largest fish in their genus, approaching a maximum length of 70 cm or 28 inches. Smaller individuals are sometimes commercially referred to as slips in the UK market.
Good reading and sources
The facts on this page come from the Wikipedia article "Common sole", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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