The Manila clam ( Ruditapes philippinarum , Adam & Reeve 1850) is a non-indigenous species that was introduced in Europe (France) the 1970s for commercial purposes, and reached Portugal 1980s. Currently, it occurs several European coastal systems, from Bay of Biscay to north Mediterranean. In Portugal, present estuarine systems lagoons south, such as Ria de Aveiro, Óbidos Lagoon Sado es...