The oyster size, called “calibre” is set
by French and European Regulation.
The calibre is defined by the oyster weight.
The calibre is given by “number”, from 0 to 5,
the number 0 for the biggest oysters and
the number 5 for the smallest oysters.
You can find the perfect oyster for you!
Flat oysters
![](https://huitres-cadoret.fr/wp-content/uploads/2022/11/Calibrage_1-1-e1668705256487.jpg)
Rock oysters
![](https://huitres-cadoret.fr/wp-content/uploads/2022/11/Calibrage_2-1-e1668705239846.jpg)