As an economically important sea food, the scallop is prized for its large and delicious adductor muscle.Studying the molecular basis of scallop muscle growth is important for both scallop breeding and our understanding of muscle mass regulation in bivalve.Myostatin which is a member of the transforming growth factor-β (TGF-β) superfamily plays important roles in muscle growth and development of mammal.We have cloned and characterized myostatin gene form scallop Chlamysfarreri in previous study.Here we report a SNP (-802 G>T) in the promoter region of this gene and its association with adductor muscle mass of C.