Translate the following English sentence to French:
"In places where molluscs are most abundant - and I am thinking of the Ferrol and Arosa estuaries - the size of carpetshells does not exceed 36 or 38 millimetres."
Dans les zones d' abondance - je pense aux rias de Ferrol et d' Arosa - la clovisse ne dépasse pas les 36 à 38 mm.