Molluscan fisheries, constituted by bivalves, gastropods and cephalopods account for 11.6% of the world aquatic production. Mussels are widely distributed in tropical and temperate conditions, found typically attached to hard substratum with their byssus threads, in the intertidal and subtidal zones. This thesis encompasses the study on temporal and spatial variations in selected physicochemical parameters of the mussel beds along Dakshina Kannada, Karnataka, India. It deals with the investigations on selected trace metals and organochlorine pesticides in the shellfish waters, their...