Aspects of the digestive gland cells of the mussel Mytilus galloprovincialis, in relation to lysosomal enzymes, lipofuscin presence and shell size: Contribution in the assessment of marine pollution biomarkers

► Hex is more suitable enzyme for lysosomal membrane stability and morphometrical alterations of lysosomes. ► Lipofuscin granules restrict the activity of the lysosomal enzymes. ► For the first time the response of cellular parameters in different-sized mussels Mytilus galloprovincialis.