by natural development,        by assimilation of nutriment; increase in size or substance. * from Dictionary.com . Products Mussels Mytilus galloprovincialis Grown in Sagres Sizes till 200g Manila clam Ruditapes philippinarum Grown in Tagus Estuary Relaying in  Sagres Sizes till 25g Grooved carpet shell Ruditapes decussatus Grown in Ria Formosa