Primeras citas de diversos moluscos marinos alóctonos en el Delta del Ebro (Cataluña, España)

Six marine exotic species are cited for the first time in the Delta del Ebro (Tarragona, Spain). For two of them, Crepipatella dilatata and Pollia assimilis, this is the first citation in the whole Mediterranean Sea. Aquaculture linked to mussels and oysters, an important economic activity in the area, seems the more likely origin for most of these species.