MUSSELS too much mercury, too many pesticides, too many herbicides, too many chemicals in anything that comes from our oceans. Businesses use our oceans and waterways to rid themselves of toxic chemicals. The majority of species of bivalve molluscs live in the sea, but in addition, a number of different families live in freshwater (and in some cases also in brackish water). There is too much protein in mussels to aide PKD.