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Mussel:professional buying guide, season, bouchot or rope-grown, PDO and TSG

Mussels for the trade: bouchot season from July to winter, bouchot, rope-grown or Spanish, PDO and TSG, health label, flesh content and substitutes.

Updated 6 min readLiveCriée editorial team

Contents
  1. Buying sheet
  2. When to buy mussels?
  3. Bouchot, PDO, TSG: what do the claims guarantee?
  4. How to check a batch of mussels?
  5. What to replace mussels with?
  6. What makes the price of mussels move?
  7. Frequently asked questions

The mussel is mostly a farmed shellfish: in France, the blue mussel (Mytilus edulis) is grown on wooden stakes, the bouchots, in Normandy, Brittany, Pays de la Loire and Charente-Maritime, and the Mediterranean mussel (Mytilus galloprovincialis) on ropes, at sea or in lagoons; it is sold live, by the kilo or by the case, and its season is that of its flesh content. Like all live shellfish, it travels with a health label that guarantees its origin.

Buying sheet

Mussel
Scientific namesMytilus edulis (bouchot, Atlantic and English Channel), Mytilus galloprovincialis (Mediterranean, Spain)
Peak seasonBouchot: from summer to winter, depending on the growing area (Bay of Mont-Saint-Michel PDO: usually from July to February). Out of season in spring (spawning, little flesh)
Closed seasonNot applicable to farming; occasional health closures of production areas
Minimum sizeNo EU size. In France, 4 cm for mussels fished by professionals in the Atlantic, English Channel and North Sea; no size for farmed mussels
Examples of presentations on price listsBouchot mussel, rope-grown mussel, "large" or "medium"; cases of 5, 10 or 15 kg (common practice, not a standard)
Main French fish auctionsNot applicable: mussels do not appear in the FranceAgriMer report on auction halls, they are sold almost entirely outside the fish auctions
French production54,431 t sold for consumption in 2023, for €136 million (Agreste)
OriginsFrance (Bay of Mont-Saint-Michel, Cotentin, north Brittany, Bay of Aiguillon, Charente straits, Thau lagoon); a large share is imported, as French production is lower than consumption (French Senate, 2019)
Production methodsBouchot (stakes), rope culture (ropes at sea), on-bottom beds; a little fishing on natural beds
YieldAbout 24% of the weight as flesh (FAO, blue mussel); varies widely with how full the mussels are
StorageLive, cool, dry: once packed, it must be neither re-immersed nor sprayed with water (Regulation EC 853/2004); in its original packaging with the health label

Yield: FAO Fisheries Technical Paper No 309 (1989). Production: Agreste, quoted by FranceAgriMer (Chiffres-clés 2024). Labels: INAO.

When to buy mussels?

French bouchot mussels are sold from summer to winter, depending on the growing area. For the Bay of Mont-Saint-Michel PDO, the season usually opens in July and runs until February, depending on the quantities produced (INAO). In spring, the mussel spawns (spat collection usually takes place from March to June, according to the DIRM Sud-Atlantique) and its flesh gets thinner: this is the bouchot low season. This spring gap is filled by rope-grown mussels and imported mussels. A mussel dish kept on the menu all year round therefore changes origin over the months.

  • 54,431 tof mussels sold by French shellfish farmers in 2023
  • €136Min sales
  • 1.8 kgof mussels eaten per inhabitant in 2023

Source: FranceAgriMer, Chiffres-clés 2024, from Agreste.

Bouchot, PDO, TSG: what do the claims guarantee?

ClaimWhat it guaranteesWhat it does not guarantee
TSG Moules de bouchotA traditional farming method on stakesA specific region
PDO Moules de bouchot de la baie du Mont-Saint-MichelFarming on the bouchots of the bay, sorting and packing within the area of the designation; sale under this name only when the required taste and flesh content are reached, usually from July to FebruaryA size grade
Rope-grown mussel (moule de filière)Farming on ropes in open waterAn origin; a rope-grown mussel can be French or imported

The "Moules de bouchot" TSG, registered in 2013, was the first French traditional speciality guaranteed (INAO). The details of the official quality signs are in the labels guide.

How to check a batch of mussels?

  • The health label: identification mark of the dispatch centre, species (common name and scientific name), packing date. The retailer keeps it for at least 60 days after splitting the batch (Regulation EC 853/2004).
  • The shells: closed, or closing when tapped; few broken shells.
  • The smell: of the sea and fresh. Dead mussels, open and unresponsive, are thrown away.

Production areas are classified by the French State according to their health quality, and can be closed temporarily (algal toxins, contamination).

What to replace mussels with?

UseSubstituteNote
Moules marinières, springRope-grown mussel, Spanish musselto cover the bouchot low season
Shellfish in sauce, pastaClam (palourde), cocklemore expensive, need purging of sand
Seafood platterWarty venus clam (praire), dog cockle (amande de mer)served raw

What makes the price of mussels move?

Price of mussels in France, by stagePrice
Sales by shellfish farmers, all mussels (2023)about €2.50/kg on average
Wholesale, Rungis market (MIN), French bouchot mussel (2024)€4.50/kg excl. VAT until 3 February, €4.00/kg excl. VAT from 6 February to December
Wholesale, Rungis market (MIN), Spanish mussel (2024)€2.90/kg excl. VAT all year round
Retail, bouchot mussel (2024)about €6.30/kg incl. VAT as a yearly average

No auction price: mussels are sold outside the fish auctions. Production: value of sales for consumption divided by their volume (€136 million for 54,431 t in 2023, calculated by the editorial team; Agreste, quoted by FranceAgriMer). Wholesale: wholesalers' quotations at the Rungis market (RNM FranceAgriMer, 2024). Retail: yearly average retail price in metropolitan France (Source: Insee, series updated on 15 January 2026). These figures do not cover the same product or the same year: they place the stages, they do not break down a margin. The price paid to your supplier also depends on the packing, transport and size grade.

On the Rungis quotations, mussels move little. In 2024, the quotation for French bouchot mussels changed only once, from €4.50 to €4.00/kg excl. VAT in February, and did not go back up in spring, during the bouchot low season: in the low season, it is the origin that changes on price lists (rope-grown, imported) more than the price. From March to December, the Spanish mussel was quoted about €1.10/kg below the French bouchot mussel, and the Dutch sea mussel between €2.55 and €2.70/kg excl. VAT. These wholesale quotations say nothing about the size grade or the claim (PDO, TSG).

  • The origin and the claim: French bouchot above imported mussels on the Rungis quotations.
  • The season: in spring, when bouchot mussels are out of season, supply shifts to rope-grown and imported mussels.
  • Mortalities: disease outbreaks cut French production by a quarter in volume between about 2014 and 2018, according to the French Senate (2019).
  • Health closures: a closed area takes part of the supply off the market from one day to the next.

Frequently asked questions

When are bouchot mussels in season?

From summer to winter, depending on the growing area; for the Bay of Mont-Saint-Michel PDO, usually from July to February. In spring, the mussel spawns and its flesh gets thinner: rope-grown and imported mussels take over.

What is the difference between bouchot and rope-grown mussels?

The farming method: the bouchot mussel grows on wooden stakes planted in the foreshore, the rope-grown mussel on ropes hanging in open water. The "bouchot" claim is protected by a TSG.

What is the price of bouchot mussels?

In 2024, the French bouchot mussel was quoted at €4.00/kg excl. VAT by wholesalers at the Rungis market from 6 February to December (€4.50/kg before that), against €2.90/kg for the Spanish mussel (RNM FranceAgriMer). At retail, it sold on average for about €6.30/kg incl. VAT (INSEE). There is no auction price for mussels.

How much flesh does a kilo of mussels give?

About a quarter of the weight, according to the FAO, but the flesh content varies a lot with the season and the farming. This is what the rules of the Bay of Mont-Saint-Michel PDO control.

Why keep the label of a case of mussels?

Because the regulation requires it: when a batch of live shellfish is split for sale, the retailer keeps the label for at least 60 days. In case of an alert, it makes it possible to trace the origin and the batch.

Sources

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