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Worldwide, people obtain great part of their animal protein from shellfish. Bivalves are key components of marine environments because, as filter feeders, they play a critical role in maintaining water quality and ecosystem integrity (Lee et. al., 2001). Bivalves are abundant resources for the shore inhabitants (Dumbauld et. al., 2009). The clam Paphia undulata of the family Veneridae is among the most popular eatable clam and is consumed locally in Egypt. It was noticed that clam population declined across the Egyptian fisheries in the past decade. This is mostly attributed to overexploitation, pollution and parasites (El-Gamal, 2010). Parasites infect many species of marine bivalves throughout the world (Hine and Diggles 2002). Mass mortality of bivalves was recorded to be associated with presence of parasites (Lee et. al., 2001). Studies on ARTICLE INFO ABSTRACT Article History: Received: July 7, 2020 Accepted: Sept. 8, 2020 Online: Sept. 17, 2020

Biometric and histological studies of the shellfish Paphia undulata infested with parasites