Comparative Study of Domoic Acid Accumulation, Isomer Content and Associated Digestive Subcellular Processes in Five Marine Invertebrate Species

•Domoic acid accumulation rates differ between shellfish species.•DA biotransformation profiles are similar among pectinids and different for the rest of the tested species.•Subcellular localization of domoic acid appears to be species specific.•Autophagy seems to be behind the long retention of domoic acid in Pecten maximus.