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The culture of scallop Patinopecten yessoensis, is a significant industry in Liaoning, China.However, a problem associated with the bottom culture is that numerous Polydora blisters were found.These blisters containing the compact sludge can occupy a large proportion of the mantle cavity space and contribute to weakening the shell.A scallop devotes much of its energy in secreting nacre and concholin during mud blister formation, which leads to poor quality and low growth rate.Now a further study has been made ofPolydora ciliata (Johnston, 1838), a parasite of the scallop Patinopecten yessoensis (Bivalvia, Mollusca) in the North China.