In this paper,scanning electron microscopic studies on digestive tract mucosa of mullet (Liza haematocheila) are presented. This reveals the mucosal ultrastructural characteristics of the oesophagus, stomach and intestine of mullet (Liza heamatocheila). These characteristics are closely related to diets (plankton,benthic algae and organic debris),markedly different from those of herbivorous and carnivorous fishes.