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Boyard & Co produce all the oysters grade and categories Do you know the different grades? Classification and denomination of hollow oysters used to be the AFNOR 85344 norm, but today it is the norm of the interprofessional agreement of the Shellfish culture national committee in force since January 1st 2001 which has to be fill in. Hollow oysters classification is determined before the expedition, in function of the unit weight. According to the denomination , grades are as follow: Denomination | Fines de claires,
Green Fines de claires Label Rouge,
Spécials de claires,
Pousses en claires label Rouge | Categories | Unit weight Tolerance limits | N°5 | 30 to 45 g | N°4 | 46 to 65 g | N°3 | 66 to 85 g | N°2 | 86 to 110 g | N°1 | 111 to 150 g | N°0 | more than 150 g |
Source: Interprofessional agreement of CNC It is strictly forbidden to sell oysters under 30g Categories: N°5 means “small oysters”
N°4 and N°3 “medium”
N°2 “big”
N°1 and N°0 “very big” Quality index The Quality index is the norm determined first by AFNOR and replaced by the interprofessional agreement of the CNC. I= (ml*100)/m0 I= index
m0= Weight in gram (1 gram = 0,0353 oz) of 20 oysters before opening
m1= Weight in gram of the drained flesh of the same 20 oysters. |
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Fines de Claires are refined hollow oysters put in claires (basins hollowed on the clayey ground, naturally waterproof, filled with water-sea by a net of gutter, which communicate with the sea) with a full immersion at least 2 weeks with 1kg/m² from the 1st of April to the 31st of October, and 3 weeks with 3 kg/m² from November 1st to March 31st, including a quality index between 6,5 and 10,5. |
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 GFCLR are refined hollow oysters in claires of the Marennes-Oleron basin, with a full immersion at least 2 weeks with 1kg/m², from the 1st of April to the 31st of October, and 3 weeks with 3kg/m², from November 1st to March 31st , including a quality index more than 9.
These Oysters are green, round, and fleshy. The oysters must be sold by units in their closed original packing. |
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Specials are refined hollow oysters in claires with a full immersion at least 2 weeks with 1kg/m², from the 1st of April to the 31st of October, and 3 weeks with 3kg/m², from November 1st to March 31st , including a quality index more than 10,5 These oysters are round, and fleshy. |
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The Pousses en Claires are hollow oysters with a full immersion of at least 4 months with a maximal density of 5 oysters by m² (with a preference of 2 oysters by m²). The quality index is above 12. The calibre are the same as the Special: the minimum size to be sold is 50g. These oysters are rounds and fleshy, with the tang of the soil of Marennes-Oleron. The flesh has a fruity taste and is full in the mouth. Branchiae are not necessarily green. |
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How to choose ? 
